diff --git a/.eslintrc.es5.json b/.eslintrc.es5.json
index 93362e57ae..c736e862fe 100644
--- a/.eslintrc.es5.json
+++ b/.eslintrc.es5.json
@@ -72,7 +72,6 @@
     "one-var": 0,
     "camelcase": 0,
     "spaced-comment": 0,
-    "quotes": 0,
     "padded-blocks": 0,
     "object-curly-spacing": 0,
     "strict": 0,
diff --git a/assets/js/src/ajax.js b/assets/js/src/ajax.js
index 81eb615d9a..70f216ca5e 100644
--- a/assets/js/src/ajax.js
+++ b/assets/js/src/ajax.js
@@ -2,7 +2,7 @@ function requestFailed(errorMessage, xhr) {
   if (xhr.responseJSON) {
     return xhr.responseJSON;
   }
-  var message = errorMessage.replace("%d", xhr.status);
+  var message = errorMessage.replace('%d', xhr.status);
   return {
     errors: [
       {
diff --git a/assets/js/src/analytics_event.js b/assets/js/src/analytics_event.js
index 170e7bbcf3..2a4fdc8c8a 100644
--- a/assets/js/src/analytics_event.js
+++ b/assets/js/src/analytics_event.js
@@ -18,7 +18,7 @@
 var eventsCache = [];
 
 function track(name, data){
-  if (typeof window.mixpanel.track !== "function") {
+  if (typeof window.mixpanel.track !== 'function') {
     window.mixpanel.init(window.mixpanelTrackingId);
   }
   window.mixpanel.track(name, data);
@@ -44,7 +44,7 @@ function trackCachedEvents() {
 }
 
 function initializeMixpanelWhenLoaded() {
-  if (typeof window.mixpanel === "object") {
+  if (typeof window.mixpanel === 'object') {
     exportMixpanel(MailPoet);
     trackCachedEvents();
   } else {
diff --git a/assets/js/src/form_editor/form_editor.js b/assets/js/src/form_editor/form_editor.js
index 8013794118..58fb388642 100644
--- a/assets/js/src/form_editor/form_editor.js
+++ b/assets/js/src/form_editor/form_editor.js
@@ -694,7 +694,7 @@ WysijaForm.DraggableItem = Class.create({
     return this.element.up('ul');
   },
   insert: function() {
-    $$("body")[0].insert(this.clone);
+    $$('body')[0].insert(this.clone);
   },
   onMousedown: function(event) {
     var draggable = new Draggable(this.clone, {
diff --git a/assets/js/src/handlebars_helpers.js b/assets/js/src/handlebars_helpers.js
index 8d095ac34f..d741141941 100644
--- a/assets/js/src/handlebars_helpers.js
+++ b/assets/js/src/handlebars_helpers.js
@@ -19,7 +19,7 @@ define('handlebars_helpers', ['handlebars'], function(Handlebars) {
           }
 
           // set date format
-          var f = block.hash.format || "MMM Do, YYYY";
+          var f = block.hash.format || 'MMM Do, YYYY';
           // check if we passed a timestamp
           if(parseInt(timestamp, 10) == timestamp) {
               return moment.unix(timestamp).format(f);
@@ -67,7 +67,7 @@ define('handlebars_helpers', ['handlebars'], function(Handlebars) {
   });
 
   Handlebars.registerHelper('nl2br', function(value, block) {
-      return value.gsub("\n", "<br />");
+      return value.gsub('\n', '<br />');
   });
 
   Handlebars.registerHelper('json_encode', function(value, block) {
@@ -78,7 +78,7 @@ define('handlebars_helpers', ['handlebars'], function(Handlebars) {
       return JSON.parse(value);
   });
   Handlebars.registerHelper('url', function(value, block) {
-      var url = window.location.protocol + "//" + window.location.host + window.location.pathname;
+      var url = window.location.protocol + '//' + window.location.host + window.location.pathname;
 
       return url + value;
   });
@@ -99,7 +99,7 @@ define('handlebars_helpers', ['handlebars'], function(Handlebars) {
       // extract all lines into an array
       if(value === undefined) return '';
 
-      var lines = value.trim().split("\n");
+      var lines = value.trim().split('\n');
 
       // remove header & footer
       lines.shift();
@@ -148,10 +148,10 @@ define('handlebars_helpers', ['handlebars'], function(Handlebars) {
       case 'Courier New': return new Handlebars.SafeString("'Courier New', Courier, 'Lucida Sans Typewriter', 'Lucida Typewriter', monospace");
       case 'Georgia': return new Handlebars.SafeString("Georgia, Times, 'Times New Roman', serif");
       case 'Lucida': return new Handlebars.SafeString("'Lucida Sans Unicode', 'Lucida Grande', sans-serif");
-      case 'Tahoma': return new Handlebars.SafeString("Tahoma, Verdana, Segoe, sans-serif");
+      case 'Tahoma': return new Handlebars.SafeString('Tahoma, Verdana, Segoe, sans-serif');
       case 'Times New Roman': return new Handlebars.SafeString("'Times New Roman', Times, Baskerville, Georgia, serif");
       case 'Trebuchet MS': return new Handlebars.SafeString("'Trebuchet MS', 'Lucida Grande', 'Lucida Sans Unicode', 'Lucida Sans', Tahoma, sans-serif");
-      case 'Verdana': return new Handlebars.SafeString("Verdana, Geneva, sans-serif");
+      case 'Verdana': return new Handlebars.SafeString('Verdana, Geneva, sans-serif');
       default: return font;
     }
   });
diff --git a/assets/js/src/i18n.js b/assets/js/src/i18n.js
index d23a8f98bc..98581cd35e 100644
--- a/assets/js/src/i18n.js
+++ b/assets/js/src/i18n.js
@@ -14,7 +14,7 @@ define('i18n',
       translations[key] = value;
     },
     t: function(key) {
-      return translations[key] || 'TRANSLATION "%$1s" NOT FOUND'.replace("%$1s", key);
+      return translations[key] || 'TRANSLATION "%$1s" NOT FOUND'.replace('%$1s', key);
     },
     all: function() {
       return translations;
diff --git a/assets/js/src/iframe.js b/assets/js/src/iframe.js
index 91a6893135..ea9c55aae6 100644
--- a/assets/js/src/iframe.js
+++ b/assets/js/src/iframe.js
@@ -17,7 +17,7 @@ define('iframe', ['mailpoet'], function(mp) {
 
       iframe.style.height = (
         parseInt(i, 10) + this.marginY
-      ) + "px";
+      ) + 'px';
     }
   };
 
diff --git a/assets/js/src/mp2migrator.js b/assets/js/src/mp2migrator.js
index 5bcf32bad7..1ec4ae7e27 100644
--- a/assets/js/src/mp2migrator.js
+++ b/assets/js/src/mp2migrator.js
@@ -28,8 +28,8 @@ define('mp2migrator', ['mailpoet', 'jquery'], function(mp, jQuery) {
         url: mailpoet_mp2_migrator.log_file_url,
         cache: false
       }).done(function (result) {
-        jQuery("#logger").html('');
-        result.split("\n").forEach(function (resultRow) {
+        jQuery('#logger').html('');
+        result.split('\n').forEach(function (resultRow) {
           var row = resultRow;
           if(row.substr(0, 7) === '[ERROR]' || row.substr(0, 9) === '[WARNING]' || row === MailPoet.I18n.t('import_stopped_by_user')) {
             row = '<span class="error_msg">' + row + '</span>'; // Mark the errors in red
@@ -39,10 +39,10 @@ define('mp2migrator', ['mailpoet', 'jquery'], function(mp, jQuery) {
             jQuery('#import-actions').hide();
             jQuery('#upgrade-completed').show();
           }
-          jQuery("#logger").append(row + "<br />\n");
+          jQuery('#logger').append(row + '<br />\n');
 
         });
-        jQuery("#logger").append('<span class="error_msg">' + MailPoet.MP2Migrator.fatal_error + '</span>' + "<br />\n");
+        jQuery('#logger').append('<span class="error_msg">' + MailPoet.MP2Migrator.fatal_error + '</span>' + '<br />\n');
       }).always(function () {
         if(MailPoet.MP2Migrator.is_logging) {
           MailPoet.MP2Migrator.displayLogs_timeout = setTimeout(MailPoet.MP2Migrator.displayLogs, 1000);
diff --git a/assets/js/src/newsletter_editor/behaviors/ColorPickerBehavior.js b/assets/js/src/newsletter_editor/behaviors/ColorPickerBehavior.js
index bfcc9e5051..6fc14a32f8 100644
--- a/assets/js/src/newsletter_editor/behaviors/ColorPickerBehavior.js
+++ b/assets/js/src/newsletter_editor/behaviors/ColorPickerBehavior.js
@@ -17,7 +17,7 @@ define([
         clickoutFiresChange: true,
         showInput: true,
         showInitial: true,
-        preferredFormat: "hex6",
+        preferredFormat: 'hex6',
         allowEmpty: true,
         chooseText: MailPoet.I18n.t('selectColor'),
         cancelText: MailPoet.I18n.t('cancelColorSelection')
diff --git a/assets/js/src/newsletter_editor/behaviors/ResizableBehavior.js b/assets/js/src/newsletter_editor/behaviors/ResizableBehavior.js
index 48ac6a540e..9bf478992d 100644
--- a/assets/js/src/newsletter_editor/behaviors/ResizableBehavior.js
+++ b/assets/js/src/newsletter_editor/behaviors/ResizableBehavior.js
@@ -19,8 +19,8 @@ define([
       modelField: 'styles.block.height'
     },
     events: {
-      "mouseenter": 'showResizeHandle',
-      "mouseleave": 'hideResizeHandle'
+      'mouseenter': 'showResizeHandle',
+      'mouseleave': 'hideResizeHandle'
     },
     onRender: function() {
       this.attachResize();
diff --git a/assets/js/src/newsletter_editor/behaviors/SortableBehavior.js b/assets/js/src/newsletter_editor/behaviors/SortableBehavior.js
index 66f0f9ca5d..bc6e93ff9d 100644
--- a/assets/js/src/newsletter_editor/behaviors/SortableBehavior.js
+++ b/assets/js/src/newsletter_editor/behaviors/SortableBehavior.js
@@ -16,7 +16,7 @@ define([
 
       if (_.isFunction(this.$el.sortable)) {
         this.$el.sortable({
-          cursor: "move",
+          cursor: 'move',
           start: function(event, ui) {
             ui.item.data('previousIndex', ui.item.index());
           },
diff --git a/assets/js/src/newsletter_editor/behaviors/TextEditorBehavior.js b/assets/js/src/newsletter_editor/behaviors/TextEditorBehavior.js
index 06869e1a3a..27599e7287 100644
--- a/assets/js/src/newsletter_editor/behaviors/TextEditorBehavior.js
+++ b/assets/js/src/newsletter_editor/behaviors/TextEditorBehavior.js
@@ -13,12 +13,12 @@ define([
   BL.TextEditorBehavior = Marionette.Behavior.extend({
     defaults: {
       selector: '.mailpoet_content',
-      toolbar1: "bold italic link unlink forecolor mailpoet_shortcodes",
-      toolbar2: "",
-      validElements: "p[class|style],span[class|style],a[href|class|title|target|style],strong[class|style],em[class|style],strike,br",
-      invalidElements: "script",
+      toolbar1: 'bold italic link unlink forecolor mailpoet_shortcodes',
+      toolbar2: '',
+      validElements: 'p[class|style],span[class|style],a[href|class|title|target|style],strong[class|style],em[class|style],strike,br',
+      invalidElements: 'script',
       blockFormats: 'Paragraph=p',
-      plugins: "link textcolor colorpicker mailpoet_shortcodes",
+      plugins: 'link textcolor colorpicker mailpoet_shortcodes',
       configurationFilter: function(originalConfig) { return originalConfig; }
     },
     onDomRefresh: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/automatedLatestContent.js b/assets/js/src/newsletter_editor/blocks/automatedLatestContent.js
index 7cc3416374..d57dbae869 100644
--- a/assets/js/src/newsletter_editor/blocks/automatedLatestContent.js
+++ b/assets/js/src/newsletter_editor/blocks/automatedLatestContent.js
@@ -28,7 +28,7 @@ define([
     jQuery
   ) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -128,12 +128,12 @@ define([
   });
 
   Module.AutomatedLatestContentBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_automated_latest_content_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_automated_latest_content_block mailpoet_droppable_block',
     initialize: function() {
       function replaceButtonStylesHandler(data) {
-        this.model.set({"readMoreButton": data});
+        this.model.set({'readMoreButton': data});
       }
-      App.getChannel().on("replaceAllButtonStyles", replaceButtonStylesHandler.bind(this));
+      App.getChannel().on('replaceAllButtonStyles', replaceButtonStylesHandler.bind(this));
     },
     getTemplate: function() { return templates.automatedLatestContentBlock; },
     regions: {
@@ -171,28 +171,28 @@ define([
     getTemplate: function() { return templates.automatedLatestContentBlockSettings; },
     events: function() {
       return {
-        "click .mailpoet_automated_latest_content_hide_display_options": 'toggleDisplayOptions',
-        "click .mailpoet_automated_latest_content_show_display_options": 'toggleDisplayOptions',
-        "click .mailpoet_automated_latest_content_select_button": 'showButtonSettings',
-        "click .mailpoet_automated_latest_content_select_divider": 'showDividerSettings',
-        "change .mailpoet_automated_latest_content_read_more_type": 'changeReadMoreType',
-        "change .mailpoet_automated_latest_content_display_type": 'changeDisplayType',
-        "change .mailpoet_automated_latest_content_title_format": 'changeTitleFormat',
-        "change .mailpoet_automated_latest_content_title_as_links": _.partial(this.changeBoolField, 'titleIsLink'),
-        "change .mailpoet_automated_latest_content_show_divider": _.partial(this.changeBoolField, 'showDivider'),
-        "input .mailpoet_automated_latest_content_show_amount": _.partial(this.changeField, "amount"),
-        "change .mailpoet_automated_latest_content_content_type": _.partial(this.changeField, "contentType"),
-        "change .mailpoet_automated_latest_content_include_or_exclude": _.partial(this.changeField, "inclusionType"),
-        "change .mailpoet_automated_latest_content_title_alignment": _.partial(this.changeField, "titleAlignment"),
-        "change .mailpoet_automated_latest_content_image_full_width": _.partial(this.changeBoolField, "imageFullWidth"),
-        "change .mailpoet_automated_latest_content_featured_image_position": _.partial(this.changeField, "featuredImagePosition"),
-        "change .mailpoet_automated_latest_content_show_author": _.partial(this.changeField, "showAuthor"),
-        "input .mailpoet_automated_latest_content_author_preceded_by": _.partial(this.changeField, "authorPrecededBy"),
-        "change .mailpoet_automated_latest_content_show_categories": _.partial(this.changeField, "showCategories"),
-        "input .mailpoet_automated_latest_content_categories": _.partial(this.changeField, "categoriesPrecededBy"),
-        "input .mailpoet_automated_latest_content_read_more_text": _.partial(this.changeField, "readMoreText"),
-        "change .mailpoet_automated_latest_content_sort_by": _.partial(this.changeField, "sortBy"),
-        "click .mailpoet_done_editing": "close"
+        'click .mailpoet_automated_latest_content_hide_display_options': 'toggleDisplayOptions',
+        'click .mailpoet_automated_latest_content_show_display_options': 'toggleDisplayOptions',
+        'click .mailpoet_automated_latest_content_select_button': 'showButtonSettings',
+        'click .mailpoet_automated_latest_content_select_divider': 'showDividerSettings',
+        'change .mailpoet_automated_latest_content_read_more_type': 'changeReadMoreType',
+        'change .mailpoet_automated_latest_content_display_type': 'changeDisplayType',
+        'change .mailpoet_automated_latest_content_title_format': 'changeTitleFormat',
+        'change .mailpoet_automated_latest_content_title_as_links': _.partial(this.changeBoolField, 'titleIsLink'),
+        'change .mailpoet_automated_latest_content_show_divider': _.partial(this.changeBoolField, 'showDivider'),
+        'input .mailpoet_automated_latest_content_show_amount': _.partial(this.changeField, 'amount'),
+        'change .mailpoet_automated_latest_content_content_type': _.partial(this.changeField, 'contentType'),
+        'change .mailpoet_automated_latest_content_include_or_exclude': _.partial(this.changeField, 'inclusionType'),
+        'change .mailpoet_automated_latest_content_title_alignment': _.partial(this.changeField, 'titleAlignment'),
+        'change .mailpoet_automated_latest_content_image_full_width': _.partial(this.changeBoolField, 'imageFullWidth'),
+        'change .mailpoet_automated_latest_content_featured_image_position': _.partial(this.changeField, 'featuredImagePosition'),
+        'change .mailpoet_automated_latest_content_show_author': _.partial(this.changeField, 'showAuthor'),
+        'input .mailpoet_automated_latest_content_author_preceded_by': _.partial(this.changeField, 'authorPrecededBy'),
+        'change .mailpoet_automated_latest_content_show_categories': _.partial(this.changeField, 'showCategories'),
+        'input .mailpoet_automated_latest_content_categories': _.partial(this.changeField, 'categoriesPrecededBy'),
+        'input .mailpoet_automated_latest_content_read_more_text': _.partial(this.changeField, 'readMoreText'),
+        'change .mailpoet_automated_latest_content_sort_by': _.partial(this.changeField, 'sortBy'),
+        'click .mailpoet_done_editing': 'close'
       };
     },
     onRender: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/base.js b/assets/js/src/newsletter_editor/blocks/base.js
index 8a7b7e17fe..aca60706fa 100644
--- a/assets/js/src/newsletter_editor/blocks/base.js
+++ b/assets/js/src/newsletter_editor/blocks/base.js
@@ -14,7 +14,7 @@ define([
     'modal'
   ], function(App, Marionette, SuperModel, _, jQuery, MailPoet, Modal) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       AugmentedView = Marionette.View.extend({});
@@ -55,8 +55,8 @@ define([
       'duplicate': 'duplicateBlock'
     },
     events: {
-      "mouseenter": "showTools",
-      "mouseleave": "hideTools"
+      'mouseenter': 'showTools',
+      'mouseleave': 'hideTools'
     },
     behaviors: {
       DraggableBehavior: {
@@ -180,11 +180,11 @@ define([
   Module.BlockToolsView = AugmentedView.extend({
     getTemplate: function() { return templates.genericBlockTools; },
     events: {
-      "click .mailpoet_edit_block": "changeSettings",
-      "click .mailpoet_delete_block_activate": "showDeletionConfirmation",
-      "click .mailpoet_delete_block_cancel": "hideDeletionConfirmation",
-      "click .mailpoet_delete_block_confirm": "deleteBlock",
-      "click .mailpoet_duplicate_block": "duplicateBlock"
+      'click .mailpoet_edit_block': 'changeSettings',
+      'click .mailpoet_delete_block_activate': 'showDeletionConfirmation',
+      'click .mailpoet_delete_block_cancel': 'hideDeletionConfirmation',
+      'click .mailpoet_delete_block_confirm': 'deleteBlock',
+      'click .mailpoet_duplicate_block': 'duplicateBlock'
     },
     // Markers of whether these particular tools will be used for this instance
     tools: {
@@ -298,7 +298,7 @@ define([
     behaviors: {
       DraggableBehavior: {
         drop: function() {
-          throw "Unsupported operation";
+          throw 'Unsupported operation';
         }
       }
     }
diff --git a/assets/js/src/newsletter_editor/blocks/button.js b/assets/js/src/newsletter_editor/blocks/button.js
index f08ac1cb18..1db19f50c2 100644
--- a/assets/js/src/newsletter_editor/blocks/button.js
+++ b/assets/js/src/newsletter_editor/blocks/button.js
@@ -9,7 +9,7 @@ define([
     'jquery'
   ], function(App, BaseBlock, MailPoet, _, jQuery) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -41,7 +41,7 @@ define([
   });
 
   Module.ButtonBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_button_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_button_block mailpoet_droppable_block',
     getTemplate: function() { return templates.buttonBlock; },
     onDragSubstituteBy: function() { return Module.ButtonWidgetView; },
     behaviors: _.extend({}, base.BlockView.prototype.behaviors, {
@@ -68,34 +68,34 @@ define([
     getTemplate: function() { return templates.buttonBlockSettings; },
     events: function() {
       return {
-        "input .mailpoet_field_button_text": _.partial(this.changeField, "text"),
-        "input .mailpoet_field_button_url": _.partial(this.changeField, "url"),
-        "change .mailpoet_field_button_alignment": _.partial(this.changeField, "styles.block.textAlign"),
-        "change .mailpoet_field_button_font_color": _.partial(this.changeColorField, "styles.block.fontColor"),
-        "change .mailpoet_field_button_font_family": _.partial(this.changeField, "styles.block.fontFamily"),
-        "change .mailpoet_field_button_font_size": _.partial(this.changeField, "styles.block.fontSize"),
-        "change .mailpoet_field_button_background_color": _.partial(this.changeColorField, "styles.block.backgroundColor"),
-        "change .mailpoet_field_button_border_color": _.partial(this.changeColorField, "styles.block.borderColor"),
-        "change .mailpoet_field_button_font_weight": "changeFontWeight",
+        'input .mailpoet_field_button_text': _.partial(this.changeField, 'text'),
+        'input .mailpoet_field_button_url': _.partial(this.changeField, 'url'),
+        'change .mailpoet_field_button_alignment': _.partial(this.changeField, 'styles.block.textAlign'),
+        'change .mailpoet_field_button_font_color': _.partial(this.changeColorField, 'styles.block.fontColor'),
+        'change .mailpoet_field_button_font_family': _.partial(this.changeField, 'styles.block.fontFamily'),
+        'change .mailpoet_field_button_font_size': _.partial(this.changeField, 'styles.block.fontSize'),
+        'change .mailpoet_field_button_background_color': _.partial(this.changeColorField, 'styles.block.backgroundColor'),
+        'change .mailpoet_field_button_border_color': _.partial(this.changeColorField, 'styles.block.borderColor'),
+        'change .mailpoet_field_button_font_weight': 'changeFontWeight',
 
-        "input .mailpoet_field_button_border_width": _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_width_input', _.partial(this.changePixelField, "styles.block.borderWidth").bind(this)),
-        "change .mailpoet_field_button_border_width": _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_width_input', _.partial(this.changePixelField, "styles.block.borderWidth").bind(this)),
-        "input .mailpoet_field_button_border_width_input": _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_width', _.partial(this.changePixelField, "styles.block.borderWidth").bind(this)),
+        'input .mailpoet_field_button_border_width': _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_width_input', _.partial(this.changePixelField, 'styles.block.borderWidth').bind(this)),
+        'change .mailpoet_field_button_border_width': _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_width_input', _.partial(this.changePixelField, 'styles.block.borderWidth').bind(this)),
+        'input .mailpoet_field_button_border_width_input': _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_width', _.partial(this.changePixelField, 'styles.block.borderWidth').bind(this)),
 
-        "input .mailpoet_field_button_border_radius": _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_radius_input', _.partial(this.changePixelField, "styles.block.borderRadius").bind(this)),
-        "change .mailpoet_field_button_border_radius": _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_radius_input', _.partial(this.changePixelField, "styles.block.borderRadius").bind(this)),
-        "input .mailpoet_field_button_border_radius_input": _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_radius', _.partial(this.changePixelField, "styles.block.borderRadius").bind(this)),
+        'input .mailpoet_field_button_border_radius': _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_radius_input', _.partial(this.changePixelField, 'styles.block.borderRadius').bind(this)),
+        'change .mailpoet_field_button_border_radius': _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_radius_input', _.partial(this.changePixelField, 'styles.block.borderRadius').bind(this)),
+        'input .mailpoet_field_button_border_radius_input': _.partial(this.updateValueAndCall, '.mailpoet_field_button_border_radius', _.partial(this.changePixelField, 'styles.block.borderRadius').bind(this)),
 
-        "input .mailpoet_field_button_width": _.partial(this.updateValueAndCall, '.mailpoet_field_button_width_input', _.partial(this.changePixelField, "styles.block.width").bind(this)),
-        "change .mailpoet_field_button_width": _.partial(this.updateValueAndCall, '.mailpoet_field_button_width_input', _.partial(this.changePixelField, "styles.block.width").bind(this)),
-        "input .mailpoet_field_button_width_input": _.partial(this.updateValueAndCall, '.mailpoet_field_button_width', _.partial(this.changePixelField, "styles.block.width").bind(this)),
+        'input .mailpoet_field_button_width': _.partial(this.updateValueAndCall, '.mailpoet_field_button_width_input', _.partial(this.changePixelField, 'styles.block.width').bind(this)),
+        'change .mailpoet_field_button_width': _.partial(this.updateValueAndCall, '.mailpoet_field_button_width_input', _.partial(this.changePixelField, 'styles.block.width').bind(this)),
+        'input .mailpoet_field_button_width_input': _.partial(this.updateValueAndCall, '.mailpoet_field_button_width', _.partial(this.changePixelField, 'styles.block.width').bind(this)),
 
-        "input .mailpoet_field_button_line_height": _.partial(this.updateValueAndCall, '.mailpoet_field_button_line_height_input', _.partial(this.changePixelField, "styles.block.lineHeight").bind(this)),
-        "change .mailpoet_field_button_line_height": _.partial(this.updateValueAndCall, '.mailpoet_field_button_line_height_input', _.partial(this.changePixelField, "styles.block.lineHeight").bind(this)),
-        "input .mailpoet_field_button_line_height_input": _.partial(this.updateValueAndCall, '.mailpoet_field_button_line_height', _.partial(this.changePixelField, "styles.block.lineHeight").bind(this)),
+        'input .mailpoet_field_button_line_height': _.partial(this.updateValueAndCall, '.mailpoet_field_button_line_height_input', _.partial(this.changePixelField, 'styles.block.lineHeight').bind(this)),
+        'change .mailpoet_field_button_line_height': _.partial(this.updateValueAndCall, '.mailpoet_field_button_line_height_input', _.partial(this.changePixelField, 'styles.block.lineHeight').bind(this)),
+        'input .mailpoet_field_button_line_height_input': _.partial(this.updateValueAndCall, '.mailpoet_field_button_line_height', _.partial(this.changePixelField, 'styles.block.lineHeight').bind(this)),
 
-        "click .mailpoet_field_button_replace_all_styles": "applyToAll",
-        "click .mailpoet_done_editing": "close"
+        'click .mailpoet_field_button_replace_all_styles': 'applyToAll',
+        'click .mailpoet_done_editing': 'close'
       };
     },
     templateContext: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/container.js b/assets/js/src/newsletter_editor/blocks/container.js
index aaa85d333a..2a010fe9b3 100644
--- a/assets/js/src/newsletter_editor/blocks/container.js
+++ b/assets/js/src/newsletter_editor/blocks/container.js
@@ -12,7 +12,7 @@ define([
     'newsletter_editor/blocks/base'
   ], function(Backbone, Marionette, _, jQuery, App, BaseBlock) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock,
@@ -105,7 +105,7 @@ define([
     className: 'mailpoet_block mailpoet_container_block mailpoet_droppable_block mailpoet_droppable_layout_block',
     getTemplate: function() { return templates.containerBlock; },
     events: _.extend({}, base.BlockView.prototype.events, {
-      "click .mailpoet_newsletter_layer_selector": "toggleEditingLayer"
+      'click .mailpoet_newsletter_layer_selector': 'toggleEditingLayer'
     }),
     ui: {
       tools: '> .mailpoet_tools'
@@ -237,8 +237,8 @@ define([
     getTemplate: function() { return templates.containerBlockSettings; },
     events: function() {
       return {
-        "change .mailpoet_field_container_background_color": _.partial(this.changeColorField, "styles.block.backgroundColor"),
-        "click .mailpoet_done_editing": "close"
+        'change .mailpoet_field_container_background_color': _.partial(this.changeColorField, 'styles.block.backgroundColor'),
+        'click .mailpoet_done_editing': 'close'
       };
     },
     regions: {
diff --git a/assets/js/src/newsletter_editor/blocks/divider.js b/assets/js/src/newsletter_editor/blocks/divider.js
index 1faec7d3a1..12fd064f0c 100644
--- a/assets/js/src/newsletter_editor/blocks/divider.js
+++ b/assets/js/src/newsletter_editor/blocks/divider.js
@@ -9,7 +9,7 @@ define([
     'mailpoet'
   ], function(App, BaseBlock, _, jQuery, MailPoet) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -32,7 +32,7 @@ define([
   });
 
   Module.DividerBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_divider_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_divider_block mailpoet_droppable_block',
     getTemplate: function() { return templates.dividerBlock; },
     modelEvents: _.omit(base.BlockView.prototype.modelEvents, 'change'),
     behaviors: _.defaults({
@@ -87,16 +87,16 @@ define([
     getTemplate: function() { return templates.dividerBlockSettings; },
     events: function() {
       return {
-        "click .mailpoet_field_divider_style": 'changeStyle',
+        'click .mailpoet_field_divider_style': 'changeStyle',
 
-        "input .mailpoet_field_divider_border_width": _.partial(this.updateValueAndCall, '.mailpoet_field_divider_border_width_input', _.partial(this.changePixelField, "styles.block.borderWidth").bind(this)),
-        "change .mailpoet_field_divider_border_width": _.partial(this.updateValueAndCall, '.mailpoet_field_divider_border_width_input', _.partial(this.changePixelField, "styles.block.borderWidth").bind(this)),
-        "input .mailpoet_field_divider_border_width_input": _.partial(this.updateValueAndCall, '.mailpoet_field_divider_border_width', _.partial(this.changePixelField, "styles.block.borderWidth").bind(this)),
+        'input .mailpoet_field_divider_border_width': _.partial(this.updateValueAndCall, '.mailpoet_field_divider_border_width_input', _.partial(this.changePixelField, 'styles.block.borderWidth').bind(this)),
+        'change .mailpoet_field_divider_border_width': _.partial(this.updateValueAndCall, '.mailpoet_field_divider_border_width_input', _.partial(this.changePixelField, 'styles.block.borderWidth').bind(this)),
+        'input .mailpoet_field_divider_border_width_input': _.partial(this.updateValueAndCall, '.mailpoet_field_divider_border_width', _.partial(this.changePixelField, 'styles.block.borderWidth').bind(this)),
 
-        "change .mailpoet_field_divider_border_color": _.partial(this.changeColorField, "styles.block.borderColor"),
-        "change .mailpoet_field_divider_background_color": _.partial(this.changeColorField, "styles.block.backgroundColor"),
-        "click .mailpoet_button_divider_apply_to_all": "applyToAll",
-        "click .mailpoet_done_editing": "close"
+        'change .mailpoet_field_divider_border_color': _.partial(this.changeColorField, 'styles.block.borderColor'),
+        'change .mailpoet_field_divider_background_color': _.partial(this.changeColorField, 'styles.block.backgroundColor'),
+        'click .mailpoet_button_divider_apply_to_all': 'applyToAll',
+        'click .mailpoet_done_editing': 'close'
       };
     },
     modelEvents: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/footer.js b/assets/js/src/newsletter_editor/blocks/footer.js
index ccba5f53ad..bc7f0602fb 100644
--- a/assets/js/src/newsletter_editor/blocks/footer.js
+++ b/assets/js/src/newsletter_editor/blocks/footer.js
@@ -7,7 +7,7 @@ define([
     'underscore'
   ], function(App, BaseBlock, _) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -37,7 +37,7 @@ define([
   });
 
   Module.FooterBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_footer_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_footer_block mailpoet_droppable_block',
     getTemplate: function() { return templates.footerBlock; },
     modelEvents: _.extend({
       'change:styles.block.backgroundColor change:styles.text.fontColor change:styles.text.fontFamily change:styles.text.fontSize change:styles.text.textAlign change:styles.link.fontColor change:styles.link.textDecoration': 'render'
@@ -78,16 +78,16 @@ define([
     getTemplate: function() { return templates.footerBlockSettings; },
     events: function() {
       return {
-        "change .mailpoet_field_footer_text_color": _.partial(this.changeColorField, "styles.text.fontColor"),
-        "change .mailpoet_field_footer_text_font_family": _.partial(this.changeField, "styles.text.fontFamily"),
-        "change .mailpoet_field_footer_text_size": _.partial(this.changeField, "styles.text.fontSize"),
-        "change #mailpoet_field_footer_link_color": _.partial(this.changeColorField, "styles.link.fontColor"),
-        "change #mailpoet_field_footer_link_underline": function(event) {
+        'change .mailpoet_field_footer_text_color': _.partial(this.changeColorField, 'styles.text.fontColor'),
+        'change .mailpoet_field_footer_text_font_family': _.partial(this.changeField, 'styles.text.fontFamily'),
+        'change .mailpoet_field_footer_text_size': _.partial(this.changeField, 'styles.text.fontSize'),
+        'change #mailpoet_field_footer_link_color': _.partial(this.changeColorField, 'styles.link.fontColor'),
+        'change #mailpoet_field_footer_link_underline': function(event) {
         this.model.set('styles.link.textDecoration', (event.target.checked) ? event.target.value : 'none');
       },
-        "change .mailpoet_field_footer_background_color": _.partial(this.changeColorField, "styles.block.backgroundColor"),
-        "change .mailpoet_field_footer_alignment": _.partial(this.changeField, "styles.text.textAlign"),
-        "click .mailpoet_done_editing": "close"
+        'change .mailpoet_field_footer_background_color': _.partial(this.changeColorField, 'styles.block.backgroundColor'),
+        'change .mailpoet_field_footer_alignment': _.partial(this.changeField, 'styles.text.textAlign'),
+        'click .mailpoet_done_editing': 'close'
       };
     },
     templateContext: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/header.js b/assets/js/src/newsletter_editor/blocks/header.js
index 872e8af486..b5def662d3 100644
--- a/assets/js/src/newsletter_editor/blocks/header.js
+++ b/assets/js/src/newsletter_editor/blocks/header.js
@@ -7,7 +7,7 @@ define([
     'underscore'
   ], function(App, BaseBlock, _) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -37,7 +37,7 @@ define([
   });
 
   Module.HeaderBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_header_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_header_block mailpoet_droppable_block',
     getTemplate: function() { return templates.headerBlock; },
     modelEvents: _.extend({
       'change:styles.block.backgroundColor change:styles.text.fontColor change:styles.text.fontFamily change:styles.text.fontSize change:styles.text.textAlign change:styles.link.fontColor change:styles.link.textDecoration': 'render'
@@ -78,16 +78,16 @@ define([
     getTemplate: function() { return templates.headerBlockSettings; },
     events: function() {
       return {
-        "change .mailpoet_field_header_text_color": _.partial(this.changeColorField, "styles.text.fontColor"),
-        "change .mailpoet_field_header_text_font_family": _.partial(this.changeField, "styles.text.fontFamily"),
-        "change .mailpoet_field_header_text_size": _.partial(this.changeField, "styles.text.fontSize"),
-        "change #mailpoet_field_header_link_color": _.partial(this.changeColorField, "styles.link.fontColor"),
-        "change #mailpoet_field_header_link_underline": function(event) {
+        'change .mailpoet_field_header_text_color': _.partial(this.changeColorField, 'styles.text.fontColor'),
+        'change .mailpoet_field_header_text_font_family': _.partial(this.changeField, 'styles.text.fontFamily'),
+        'change .mailpoet_field_header_text_size': _.partial(this.changeField, 'styles.text.fontSize'),
+        'change #mailpoet_field_header_link_color': _.partial(this.changeColorField, 'styles.link.fontColor'),
+        'change #mailpoet_field_header_link_underline': function(event) {
           this.model.set('styles.link.textDecoration', (event.target.checked) ? event.target.value : 'none');
         },
-        "change .mailpoet_field_header_background_color": _.partial(this.changeColorField, "styles.block.backgroundColor"),
-        "change .mailpoet_field_header_alignment": _.partial(this.changeField, "styles.text.textAlign"),
-        "click .mailpoet_done_editing": "close"
+        'change .mailpoet_field_header_background_color': _.partial(this.changeColorField, 'styles.block.backgroundColor'),
+        'change .mailpoet_field_header_alignment': _.partial(this.changeField, 'styles.text.textAlign'),
+        'click .mailpoet_done_editing': 'close'
       };
     },
     templateContext: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/image.js b/assets/js/src/newsletter_editor/blocks/image.js
index a8f34b4cea..712800acc5 100644
--- a/assets/js/src/newsletter_editor/blocks/image.js
+++ b/assets/js/src/newsletter_editor/blocks/image.js
@@ -8,7 +8,7 @@ define([
     'mailpoet'
   ], function(App, BaseBlock, _, MailPoet) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock,
@@ -34,7 +34,7 @@ define([
   });
 
   Module.ImageBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_image_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_image_block mailpoet_droppable_block',
     getTemplate: function() { return templates.imageBlock; },
     onDragSubstituteBy: function() { return Module.ImageWidgetView; },
     templateContext: function() {
@@ -75,13 +75,13 @@ define([
     getTemplate: function() { return templates.imageBlockSettings; },
     events: function() {
       return {
-        "input .mailpoet_field_image_link": _.partial(this.changeField, "link"),
-        "input .mailpoet_field_image_address": 'changeAddress',
-        "input .mailpoet_field_image_alt_text": _.partial(this.changeField, "alt"),
-        "change .mailpoet_field_image_full_width": _.partial(this.changeBoolCheckboxField, "fullWidth"),
-        "change .mailpoet_field_image_alignment": _.partial(this.changeField, "styles.block.textAlign"),
-        "click .mailpoet_field_image_select_another_image": "showMediaManager",
-        "click .mailpoet_done_editing": "close"
+        'input .mailpoet_field_image_link': _.partial(this.changeField, 'link'),
+        'input .mailpoet_field_image_address': 'changeAddress',
+        'input .mailpoet_field_image_alt_text': _.partial(this.changeField, 'alt'),
+        'change .mailpoet_field_image_full_width': _.partial(this.changeBoolCheckboxField, 'fullWidth'),
+        'change .mailpoet_field_image_alignment': _.partial(this.changeField, 'styles.block.textAlign'),
+        'click .mailpoet_field_image_select_another_image': 'showMediaManager',
+        'click .mailpoet_done_editing': 'close'
       };
     },
     initialize: function(options) {
@@ -331,7 +331,7 @@ define([
             height: mainSize.height + 'px',
             width: mainSize.width + 'px',
             src: mainSize.url,
-            alt: (attachment.get('alt') !== "" && attachment.get('alt') !== undefined) ? attachment.get('alt') : attachment.get('title')
+            alt: (attachment.get('alt') !== '' && attachment.get('alt') !== undefined) ? attachment.get('alt') : attachment.get('title')
           });
           // Rerender settings view due to changes from outside of settings view
           that.render();
diff --git a/assets/js/src/newsletter_editor/blocks/posts.js b/assets/js/src/newsletter_editor/blocks/posts.js
index 724ac1a0a8..92c1a32757 100644
--- a/assets/js/src/newsletter_editor/blocks/posts.js
+++ b/assets/js/src/newsletter_editor/blocks/posts.js
@@ -37,7 +37,7 @@ define([
     DividerBlock
   ) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -176,7 +176,7 @@ define([
   });
 
   Module.PostsBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_posts_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_posts_block mailpoet_droppable_block',
     getTemplate: function() { return templates.postsBlock; },
     modelEvents: {}, // Forcefully disable all events
     regions: _.extend({
@@ -462,25 +462,25 @@ define([
     getTemplate: function() { return templates.displayOptionsPostsBlockSettings; },
     events: function() {
       return {
-        "click .mailpoet_posts_select_button": 'showButtonSettings',
-        "click .mailpoet_posts_select_divider": 'showDividerSettings',
-        "change .mailpoet_posts_read_more_type": 'changeReadMoreType',
-        "change .mailpoet_posts_display_type": 'changeDisplayType',
-        "change .mailpoet_posts_title_format": 'changeTitleFormat',
-        "change .mailpoet_posts_title_as_links": _.partial(this.changeBoolField, 'titleIsLink'),
-        "change .mailpoet_posts_show_divider": _.partial(this.changeBoolField, 'showDivider'),
-        "input .mailpoet_posts_show_amount": _.partial(this.changeField, "amount"),
-        "change .mailpoet_posts_content_type": _.partial(this.changeField, "contentType"),
-        "change .mailpoet_posts_include_or_exclude": _.partial(this.changeField, "inclusionType"),
-        "change .mailpoet_posts_title_alignment": _.partial(this.changeField, "titleAlignment"),
-        "change .mailpoet_posts_image_full_width": _.partial(this.changeBoolField, "imageFullWidth"),
-        "change .mailpoet_posts_featured_image_position": _.partial(this.changeField, "featuredImagePosition"),
-        "change .mailpoet_posts_show_author": _.partial(this.changeField, "showAuthor"),
-        "input .mailpoet_posts_author_preceded_by": _.partial(this.changeField, "authorPrecededBy"),
-        "change .mailpoet_posts_show_categories": _.partial(this.changeField, "showCategories"),
-        "input .mailpoet_posts_categories": _.partial(this.changeField, "categoriesPrecededBy"),
-        "input .mailpoet_posts_read_more_text": _.partial(this.changeField, "readMoreText"),
-        "change .mailpoet_posts_sort_by": _.partial(this.changeField, "sortBy")
+        'click .mailpoet_posts_select_button': 'showButtonSettings',
+        'click .mailpoet_posts_select_divider': 'showDividerSettings',
+        'change .mailpoet_posts_read_more_type': 'changeReadMoreType',
+        'change .mailpoet_posts_display_type': 'changeDisplayType',
+        'change .mailpoet_posts_title_format': 'changeTitleFormat',
+        'change .mailpoet_posts_title_as_links': _.partial(this.changeBoolField, 'titleIsLink'),
+        'change .mailpoet_posts_show_divider': _.partial(this.changeBoolField, 'showDivider'),
+        'input .mailpoet_posts_show_amount': _.partial(this.changeField, 'amount'),
+        'change .mailpoet_posts_content_type': _.partial(this.changeField, 'contentType'),
+        'change .mailpoet_posts_include_or_exclude': _.partial(this.changeField, 'inclusionType'),
+        'change .mailpoet_posts_title_alignment': _.partial(this.changeField, 'titleAlignment'),
+        'change .mailpoet_posts_image_full_width': _.partial(this.changeBoolField, 'imageFullWidth'),
+        'change .mailpoet_posts_featured_image_position': _.partial(this.changeField, 'featuredImagePosition'),
+        'change .mailpoet_posts_show_author': _.partial(this.changeField, 'showAuthor'),
+        'input .mailpoet_posts_author_preceded_by': _.partial(this.changeField, 'authorPrecededBy'),
+        'change .mailpoet_posts_show_categories': _.partial(this.changeField, 'showCategories'),
+        'input .mailpoet_posts_categories': _.partial(this.changeField, 'categoriesPrecededBy'),
+        'input .mailpoet_posts_read_more_text': _.partial(this.changeField, 'readMoreText'),
+        'change .mailpoet_posts_sort_by': _.partial(this.changeField, 'sortBy')
       };
     },
     templateContext: function() {
diff --git a/assets/js/src/newsletter_editor/blocks/social.js b/assets/js/src/newsletter_editor/blocks/social.js
index 5d51ce77e2..35be008944 100644
--- a/assets/js/src/newsletter_editor/blocks/social.js
+++ b/assets/js/src/newsletter_editor/blocks/social.js
@@ -11,7 +11,7 @@ define([
     'jquery'
   ], function(App, BaseBlock, Backbone, Marionette, SuperModel, _, jQuery) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock,
@@ -138,7 +138,7 @@ define([
     },
     events: function() {
       return {
-        "click .mailpoet_done_editing": "close"
+        'click .mailpoet_done_editing': 'close'
       };
     },
     initialize: function() {
@@ -158,11 +158,11 @@ define([
     getTemplate: function() { return templates.socialSettingsIcon; },
     events: function() {
       return {
-        "click .mailpoet_delete_block": "deleteIcon",
-        "change .mailpoet_social_icon_field_type": _.partial(this.changeField, "iconType"),
-        "input .mailpoet_social_icon_field_image": _.partial(this.changeField, "image"),
-        "input .mailpoet_social_icon_field_link": this.changeLink,
-        "input .mailpoet_social_icon_field_text": _.partial(this.changeField, "text")
+        'click .mailpoet_delete_block': 'deleteIcon',
+        'change .mailpoet_social_icon_field_type': _.partial(this.changeField, 'iconType'),
+        'input .mailpoet_social_icon_field_image': _.partial(this.changeField, 'image'),
+        'input .mailpoet_social_icon_field_link': this.changeLink,
+        'input .mailpoet_social_icon_field_text': _.partial(this.changeField, 'text')
       };
     },
     modelEvents: {
diff --git a/assets/js/src/newsletter_editor/blocks/spacer.js b/assets/js/src/newsletter_editor/blocks/spacer.js
index 9055068298..9e0f1f23d7 100644
--- a/assets/js/src/newsletter_editor/blocks/spacer.js
+++ b/assets/js/src/newsletter_editor/blocks/spacer.js
@@ -7,7 +7,7 @@ define([
     'underscore'
   ], function(App, BaseBlock, _) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -27,7 +27,7 @@ define([
   });
 
   Module.SpacerBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_spacer_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_spacer_block mailpoet_droppable_block',
     getTemplate: function() { return templates.spacerBlock; },
     behaviors: _.defaults({
       ResizableBehavior: {
@@ -69,8 +69,8 @@ define([
     getTemplate: function() { return templates.spacerBlockSettings; },
     events: function() {
       return {
-        "change .mailpoet_field_spacer_background_color": _.partial(this.changeColorField, "styles.block.backgroundColor"),
-        "click .mailpoet_done_editing": "close"
+        'change .mailpoet_field_spacer_background_color': _.partial(this.changeColorField, 'styles.block.backgroundColor'),
+        'click .mailpoet_done_editing': 'close'
       };
     }
   });
diff --git a/assets/js/src/newsletter_editor/blocks/text.js b/assets/js/src/newsletter_editor/blocks/text.js
index ba19283151..86997daa89 100644
--- a/assets/js/src/newsletter_editor/blocks/text.js
+++ b/assets/js/src/newsletter_editor/blocks/text.js
@@ -7,7 +7,7 @@ define([
     'underscore'
   ], function(App, BaseBlock, _) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       base = BaseBlock;
@@ -22,17 +22,17 @@ define([
   });
 
   Module.TextBlockView = base.BlockView.extend({
-    className: "mailpoet_block mailpoet_text_block mailpoet_droppable_block",
+    className: 'mailpoet_block mailpoet_text_block mailpoet_droppable_block',
     getTemplate: function() { return templates.textBlock; },
     modelEvents: _.omit(base.BlockView.prototype.modelEvents, 'change'), // Prevent rerendering on model change due to text editor redrawing
     behaviors: _.extend({}, base.BlockView.prototype.behaviors, {
       TextEditorBehavior: {
-        toolbar1: "formatselect bold italic forecolor | link unlink",
-        toolbar2: "alignleft aligncenter alignright alignjustify | bullist numlist blockquote | code mailpoet_shortcodes",
-        validElements: "p[class|style],span[class|style],a[href|class|title|target|style],h1[class|style],h2[class|style],h3[class|style],ol[class|style],ul[class|style],li[class|style],strong[class|style],em[class|style],strike,br,blockquote[class|style],table[class|style],tr[class|style],th[class|style],td[class|style]",
-        invalidElements: "script",
+        toolbar1: 'formatselect bold italic forecolor | link unlink',
+        toolbar2: 'alignleft aligncenter alignright alignjustify | bullist numlist blockquote | code mailpoet_shortcodes',
+        validElements: 'p[class|style],span[class|style],a[href|class|title|target|style],h1[class|style],h2[class|style],h3[class|style],ol[class|style],ul[class|style],li[class|style],strong[class|style],em[class|style],strike,br,blockquote[class|style],table[class|style],tr[class|style],th[class|style],td[class|style]',
+        invalidElements: 'script',
         blockFormats: 'Heading 1=h1;Heading 2=h2;Heading 3=h3;Paragraph=p',
-        plugins: "link lists code textcolor colorpicker mailpoet_shortcodes paste",
+        plugins: 'link lists code textcolor colorpicker mailpoet_shortcodes paste',
         configurationFilter: function(originalSettings) {
           return _.extend({}, originalSettings, {
             mailpoet_shortcodes: App.getConfig().get('shortcodes').toJSON(),
diff --git a/assets/js/src/newsletter_editor/components/content.js b/assets/js/src/newsletter_editor/components/content.js
index ef97ca94e7..f5d466782c 100644
--- a/assets/js/src/newsletter_editor/components/content.js
+++ b/assets/js/src/newsletter_editor/components/content.js
@@ -4,7 +4,7 @@ define([
     'underscore',
     'mailpoet'
   ], function(App, SuperModel, _, MailPoet) {
-  "use strict";
+  'use strict';
 
   var Module = {};
 
@@ -34,14 +34,14 @@ define([
     if (type in Module._blockTypes) {
       return Module._blockTypes[type].blockModel;
     } else {
-      throw "Block type not supported: " + type;
+      throw 'Block type not supported: ' + type;
     }
   };
   Module.getBlockTypeView = function(type) {
     if (type in Module._blockTypes) {
       return Module._blockTypes[type].blockView;
     } else {
-      throw "Block type not supported: " + type;
+      throw 'Block type not supported: ' + type;
     }
   };
 
diff --git a/assets/js/src/newsletter_editor/components/heading.js b/assets/js/src/newsletter_editor/components/heading.js
index 080f75c809..0b9dcd0add 100644
--- a/assets/js/src/newsletter_editor/components/heading.js
+++ b/assets/js/src/newsletter_editor/components/heading.js
@@ -6,7 +6,7 @@ define([
     'jquery'
   ], function(App, Backbone, Marionette, _, jQuery) {
 
-  "use strict";
+  'use strict';
 
   var Module = {};
 
@@ -19,8 +19,8 @@ define([
     },
     events: function() {
       return {
-        'keyup .mailpoet_input_title': _.partial(this.changeField, "subject"),
-        'keyup .mailpoet_input_preheader': _.partial(this.changeField, "preheader")
+        'keyup .mailpoet_input_title': _.partial(this.changeField, 'subject'),
+        'keyup .mailpoet_input_preheader': _.partial(this.changeField, 'preheader')
       };
     },
     changeField: function(field, event) {
@@ -33,7 +33,7 @@ define([
     MailPoet.helpTooltip.show(document.getElementById('tooltip-designer-subject-line'), {
       tooltipId: 'tooltip-designer-subject-line-ti',
       tooltip: MailPoet.I18n.t('helpTooltipDesignerSubjectLine'),
-      place: "right"
+      place: 'right'
     });
     MailPoet.helpTooltip.show(document.getElementById('tooltip-designer-preheader'), {
       tooltipId: 'tooltip-designer-preheader-ti',
diff --git a/assets/js/src/newsletter_editor/components/save.js b/assets/js/src/newsletter_editor/components/save.js
index 2493da14b8..5748c8e394 100644
--- a/assets/js/src/newsletter_editor/components/save.js
+++ b/assets/js/src/newsletter_editor/components/save.js
@@ -22,7 +22,7 @@ define([
     html2canvas
   ) {
 
-  "use strict";
+  'use strict';
 
   var Module = {},
       saveTimeout;
@@ -82,8 +82,8 @@ define([
       // Removes 1px left transparent border from resulting canvas.
 
       var oldContext = oldCanvas.getContext('2d'),
-          newCanvas = document.createElement("canvas"),
-          newContext = newCanvas.getContext("2d"),
+          newCanvas = document.createElement('canvas'),
+          newContext = newCanvas.getContext('2d'),
           leftBorderWidth = 1;
 
       newCanvas.width = oldCanvas.width;
@@ -300,8 +300,8 @@ define([
 
       var contents = JSON.stringify(jsonObject);
       if (App.getConfig().get('validation.validateUnsubscribeLinkPresent') &&
-          contents.indexOf("[link:subscription_unsubscribe_url]") < 0 &&
-          contents.indexOf("[link:subscription_unsubscribe]") < 0) {
+          contents.indexOf('[link:subscription_unsubscribe_url]') < 0 &&
+          contents.indexOf('[link:subscription_unsubscribe]') < 0) {
         this.showValidationError(MailPoet.I18n.t('unsubscribeLinkMissing'));
         return;
       }
diff --git a/assets/js/src/newsletter_editor/components/sidebar.js b/assets/js/src/newsletter_editor/components/sidebar.js
index ee2a053077..ed0f364dd9 100644
--- a/assets/js/src/newsletter_editor/components/sidebar.js
+++ b/assets/js/src/newsletter_editor/components/sidebar.js
@@ -20,7 +20,7 @@ define([
     StickyKit
   ) {
 
-  "use strict";
+  'use strict';
 
   var Module = {};
 
@@ -69,7 +69,7 @@ define([
           'slideUp',
           {
             duration: 250,
-            easing: "easeOut",
+            easing: 'easeOut',
             complete: function() {
               $openRegion.addClass('closed');
             }.bind(this)
@@ -81,7 +81,7 @@ define([
             'slideDown',
             {
               duration: 250,
-              easing: "easeIn",
+              easing: 'easeIn',
               complete: function() {
                 $targetRegion.removeClass('closed');
               }
@@ -180,40 +180,40 @@ define([
     },
     events: function() {
       return {
-        "change #mailpoet_text_font_color": _.partial(this.changeColorField, 'text.fontColor'),
-        "change #mailpoet_text_font_family": function(event) {
+        'change #mailpoet_text_font_color': _.partial(this.changeColorField, 'text.fontColor'),
+        'change #mailpoet_text_font_family': function(event) {
           this.model.set('text.fontFamily', event.target.value);
         },
-        "change #mailpoet_text_font_size": function(event) {
+        'change #mailpoet_text_font_size': function(event) {
           this.model.set('text.fontSize', event.target.value);
         },
-        "change #mailpoet_h1_font_color": _.partial(this.changeColorField, 'h1.fontColor'),
-        "change #mailpoet_h1_font_family": function(event) {
+        'change #mailpoet_h1_font_color': _.partial(this.changeColorField, 'h1.fontColor'),
+        'change #mailpoet_h1_font_family': function(event) {
           this.model.set('h1.fontFamily', event.target.value);
         },
-        "change #mailpoet_h1_font_size": function(event) {
+        'change #mailpoet_h1_font_size': function(event) {
           this.model.set('h1.fontSize', event.target.value);
         },
-        "change #mailpoet_h2_font_color": _.partial(this.changeColorField, 'h2.fontColor'),
-        "change #mailpoet_h2_font_family": function(event) {
+        'change #mailpoet_h2_font_color': _.partial(this.changeColorField, 'h2.fontColor'),
+        'change #mailpoet_h2_font_family': function(event) {
           this.model.set('h2.fontFamily', event.target.value);
         },
-        "change #mailpoet_h2_font_size": function(event) {
+        'change #mailpoet_h2_font_size': function(event) {
           this.model.set('h2.fontSize', event.target.value);
         },
-        "change #mailpoet_h3_font_color": _.partial(this.changeColorField, 'h3.fontColor'),
-        "change #mailpoet_h3_font_family": function(event) {
+        'change #mailpoet_h3_font_color': _.partial(this.changeColorField, 'h3.fontColor'),
+        'change #mailpoet_h3_font_family': function(event) {
           this.model.set('h3.fontFamily', event.target.value);
         },
-        "change #mailpoet_h3_font_size": function(event) {
+        'change #mailpoet_h3_font_size': function(event) {
           this.model.set('h3.fontSize', event.target.value);
         },
-        "change #mailpoet_a_font_color": _.partial(this.changeColorField, 'link.fontColor'),
-        "change #mailpoet_a_font_underline": function(event) {
+        'change #mailpoet_a_font_color': _.partial(this.changeColorField, 'link.fontColor'),
+        'change #mailpoet_a_font_underline': function(event) {
           this.model.set('link.textDecoration', (event.target.checked) ? event.target.value : 'none');
         },
-        "change #mailpoet_newsletter_background_color": _.partial(this.changeColorField, 'wrapper.backgroundColor'),
-        "change #mailpoet_background_color": _.partial(this.changeColorField, 'body.backgroundColor')
+        'change #mailpoet_newsletter_background_color': _.partial(this.changeColorField, 'wrapper.backgroundColor'),
+        'change #mailpoet_background_color': _.partial(this.changeColorField, 'body.backgroundColor')
       };
     },
     templateContext: function() {
diff --git a/assets/js/src/newsletter_editor/components/styles.js b/assets/js/src/newsletter_editor/components/styles.js
index baf170c73a..2e5736785f 100644
--- a/assets/js/src/newsletter_editor/components/styles.js
+++ b/assets/js/src/newsletter_editor/components/styles.js
@@ -4,7 +4,7 @@ define([
     'backbone.supermodel'
   ], function(App, Marionette, SuperModel) {
 
-  "use strict";
+  'use strict';
 
   var Module = {};
 
diff --git a/assets/js/src/newsletter_editor/tinymce/mailpoet_shortcodes/plugin.js b/assets/js/src/newsletter_editor/tinymce/mailpoet_shortcodes/plugin.js
index f6407cc368..50704adab5 100644
--- a/assets/js/src/newsletter_editor/tinymce/mailpoet_shortcodes/plugin.js
+++ b/assets/js/src/newsletter_editor/tinymce/mailpoet_shortcodes/plugin.js
@@ -46,8 +46,8 @@ tinymce.PluginManager.add('mailpoet_shortcodes', function(editor, url) {
 
       // Open window
       editor.windowManager.open({
-        height: parseInt(editor.getParam("plugin_mailpoet_shortcodes_height", 400)),
-        width: parseInt(editor.getParam("plugin_mailpoet_shortcodes_width", 450)),
+        height: parseInt(editor.getParam('plugin_mailpoet_shortcodes_height', 400)),
+        width: parseInt(editor.getParam('plugin_mailpoet_shortcodes_width', 450)),
         autoScroll: true,
         title: editor.settings.mailpoet_shortcodes_window_title,
         body: shortcodes,
diff --git a/assets/js/src/notice.js b/assets/js/src/notice.js
index 5cd7f72b8c..26dbde4a0f 100644
--- a/assets/js/src/notice.js
+++ b/assets/js/src/notice.js
@@ -1,5 +1,5 @@
 define('notice', ['mailpoet', 'jquery'], function(mp, jQuery) {
-  "use strict";
+  'use strict';
   /*==================================================================================================
 
       MailPoet Notice:
diff --git a/assets/js/src/subscribers/importExport/export.js b/assets/js/src/subscribers/importExport/export.js
index f17c78273a..ae85fd187f 100644
--- a/assets/js/src/subscribers/importExport/export.js
+++ b/assets/js/src/subscribers/importExport/export.js
@@ -13,7 +13,7 @@ define(
   Handlebars,
   select2
  ) {
-   if (!jQuery("#mailpoet_subscribers_export").length) {
+   if (!jQuery('#mailpoet_subscribers_export').length) {
      return;
    }
    jQuery(document).ready(function () {
@@ -27,11 +27,11 @@ define(
      jQuery('#mailpoet_subscribers_export > div.inside').html(subscribers_export_template(exportData));
 
      // define reusable variables
-     var segmentsContainerElement = jQuery("#export_lists"),
-      subscriberFieldsContainerElement = jQuery("#export_columns"),
+     var segmentsContainerElement = jQuery('#export_lists'),
+      subscriberFieldsContainerElement = jQuery('#export_columns'),
       exportConfirmedOptionElement = jQuery(':radio[name="option_confirmed"]'),
       groupBySegmentOptionElement = jQuery(':checkbox[name="option_group_by_list"]'),
-      nextStepButton = jQuery("a.mailpoet_export_process"),
+      nextStepButton = jQuery('a.mailpoet_export_process'),
       renderSegmentsAndFields = function (container, data) {
         if (container.data('select2')) {
           container
@@ -107,7 +107,7 @@ define(
        'first_name',
        'last_name',
        'status'
-     ]).trigger("change");
+     ]).trigger('change');
 
      exportConfirmedOptionElement.change(function () {
        var selectedSegments = segmentsContainerElement.val();
@@ -144,7 +144,7 @@ define(
           data: JSON.stringify({
             'export_confirmed_option': exportData.exportConfirmedOption,
             'export_format_option': jQuery(':radio[name="option_format"]:checked').val(),
-            'group_by_segment_option': (groupBySegmentOptionElement.is(":visible")) ? groupBySegmentOptionElement.prop('checked') : false,
+            'group_by_segment_option': (groupBySegmentOptionElement.is(':visible')) ? groupBySegmentOptionElement.prop('checked') : false,
             'segments': (exportData.segments) ? segmentsContainerElement.val() : false,
             'subscriber_fields': subscriberFieldsContainerElement.val()
           })
diff --git a/assets/js/src/subscribers/importExport/import.js b/assets/js/src/subscribers/importExport/import.js
index bc251997f5..f862d204c4 100644
--- a/assets/js/src/subscribers/importExport/import.js
+++ b/assets/js/src/subscribers/importExport/import.js
@@ -112,7 +112,7 @@ define(
            *  Paste
            */
           pasteInputElement
-              .attr('value', pasteInputPlaceholderElement).css('color', "#999")
+              .attr('value', pasteInputPlaceholderElement).css('color', '#999')
               .focus(function () {
                 if (jQuery(this).val() === pasteInputPlaceholderElement) {
                   jQuery(this).attr('value', '').css('color', '#222');
@@ -120,7 +120,7 @@ define(
               })
               .blur(function () {
                 if (jQuery(this).val() === '') {
-                  jQuery(this).attr('value', pasteInputPlaceholderElement).css('color', "#999");
+                  jQuery(this).attr('value', pasteInputPlaceholderElement).css('color', '#999');
                 }
               })
               .keyup(function () {
@@ -378,7 +378,7 @@ define(
                         processedSubscribers[0] = rowData;
                       }
                     }
-                    else if (rowData[emailColumnPosition] !== "") {
+                    else if (rowData[emailColumnPosition] !== '') {
                       var email = detectAndCleanupEmail(rowData[emailColumnPosition]);
                       if (_.has(parsedEmails, email)) {
                         duplicateEmails.push(email);
@@ -512,7 +512,7 @@ define(
                 var details = jQuery('.mailpoet_subscribers_data_parse_results_details');
                 jQuery(details).toggle();
                 this.text =
-                    (jQuery(details).is(":visible"))
+                    (jQuery(details).is(':visible'))
                         ? MailPoet.I18n.t('hideDetails')
                         : MailPoet.I18n.t('showDetails');
               });
@@ -626,7 +626,7 @@ define(
 
           // register partial template that will contain subscribers data
           Handlebars.registerPartial(
-              "subscribers_data_template_partial",
+              'subscribers_data_template_partial',
               subscribersDataTemplatePartial
           );