diff --git a/src/wp-admin/css/customize-controls.css b/src/wp-admin/css/customize-controls.css
index 9b5bbd2b9e..82713f4dc2 100644
--- a/src/wp-admin/css/customize-controls.css
+++ b/src/wp-admin/css/customize-controls.css
@@ -835,11 +835,6 @@ p.customize-section-description {
 	100% { opacity: 1; }
 }
 
-@-moz-keyframes customize-reload {
-	0%   { opacity: 0; }
-	100% { opacity: 1; }
-}
-
 @keyframes customize-reload {
 	0%   { opacity: 0; }
 	100% { opacity: 1; }
@@ -849,7 +844,6 @@ p.customize-section-description {
 .wp-customizer .customize-loading #customize-container {
 	display: block;
 	-webkit-animation: customize-reload .75s; /* Can't use `transition` because `display` changes here. */
-	-moz-animation: customize-reload .75s;
 	animation: customize-reload .75s;
 }
 
diff --git a/src/wp-admin/js/customize-controls.js b/src/wp-admin/js/customize-controls.js
index d8688ca7b5..d95287c366 100644
--- a/src/wp-admin/js/customize-controls.js
+++ b/src/wp-admin/js/customize-controls.js
@@ -570,7 +570,7 @@
 		 * @since 4.2.0
 		 */
 		attachEvents: function () {
-			var meta, section = this;
+			var section = this;
 
 			// Expand/Collapse section/panel.
 			section.container.find( '.accordion-section-title' ).on( 'click keydown', function( event ) {
@@ -636,9 +636,12 @@
 			});
 
 			section.container.on( 'input', '#themes-filter', function( event ) {
-				var term = event.currentTarget.value.toLowerCase().trim().replace( '-', ' ' ),
+				var count,
+					term = event.currentTarget.value.toLowerCase().trim().replace( '-', ' ' ),
 					controls = section.controls();
+
 				controls.pop(); // Remove the last control (the add-new control).
+
 				_.each( controls, function( control ) {
 					control.filter( term );
 				});
@@ -828,7 +831,7 @@
 		 *
 		 * @since 4.2.0
 		 */
-		closeDetails: function ( theme ) {
+		closeDetails: function () {
 			$( 'body' ).removeClass( 'modal-open' );
 			this.overlay.fadeOut( 'fast' );
 			api.control( 'theme_' + this.currentTheme ).focus();
@@ -1798,10 +1801,10 @@
 		 */
 		filter: function( term ) {
 			var control = this,
-			    haystack = control.params.theme.name + ' '
-				           + control.params.theme.description + ' '
-				           + control.params.theme.tags + ' '
-				           + control.params.theme.author;
+			    haystack = control.params.theme.name + ' ' +
+				           control.params.theme.description + ' ' +
+				           control.params.theme.tags + ' ' +
+				           control.params.theme.author;
 			haystack = haystack.toLowerCase().replace( '-', ' ' );
 			if ( -1 !== haystack.search( term ) ) {
 				control.activate();
@@ -2678,7 +2681,7 @@
 		// Prompt user with AYS dialog if leaving the Customizer with unsaved changes
 		$( window ).on( 'beforeunload', function () {
 			if ( ! api.state( 'saved' )() ) {
-				var timeout = setTimeout( function() {
+				setTimeout( function() {
 					overlay.removeClass( 'customize-loading' );
 				}, 1 );
 				return api.l10n.saveAlert;
diff --git a/src/wp-admin/js/post.js b/src/wp-admin/js/post.js
index 1b0782dda6..178deb3516 100644
--- a/src/wp-admin/js/post.js
+++ b/src/wp-admin/js/post.js
@@ -1,7 +1,7 @@
 /* global postL10n, ajaxurl, wpAjax, setPostThumbnailL10n, postboxes, pagenow, tinymce, alert, deleteUserSetting */
 /* global theList:true, theExtraList:true, getUserSetting, setUserSetting */
 
-var tagBox, commentsBox, WPSetThumbnailHTML, WPSetThumbnailID, WPRemoveThumbnail, wptitlehint, makeSlugeditClickable, editPermalink;
+var commentsBox, WPSetThumbnailHTML, WPSetThumbnailID, WPRemoveThumbnail, wptitlehint, makeSlugeditClickable, editPermalink;
 // Back-compat: prevent fatal errors
 makeSlugeditClickable = editPermalink = function(){};
 
diff --git a/src/wp-admin/js/press-this.js b/src/wp-admin/js/press-this.js
index 08b8862632..d594afef39 100644
--- a/src/wp-admin/js/press-this.js
+++ b/src/wp-admin/js/press-this.js
@@ -6,7 +6,6 @@
 	var PressThis = function() {
 		var editor,
 			saveAlert             = false,
-			$div                  = $( '<div>' ),
 			siteConfig            = window.wpPressThisConfig || {},
 			data                  = window.wpPressThisData || {},
 			smallestWidth         = 128,
@@ -64,11 +63,6 @@
 				.replace( /<\/?[a-z][^>]*>/ig, '' );
 		}
 
-		// TODO: needed?
-		function entityEncode( text ) {
-			return $div.text( text ).html();
-		}
-
 		/**
 		 * Strip HTML tags and entity encode some of the HTML special chars.
 		 *
@@ -1027,7 +1021,7 @@
 			renderNotice: renderNotice,
 			renderError: renderError
 		};
-	}
+	};
 
 	window.wp = window.wp || {};
 	window.wp.pressThis = new PressThis();
diff --git a/src/wp-admin/js/tags-box.js b/src/wp-admin/js/tags-box.js
index 0cf97b53ed..04c99f0a48 100644
--- a/src/wp-admin/js/tags-box.js
+++ b/src/wp-admin/js/tags-box.js
@@ -1,17 +1,6 @@
 /* jshint curly: false, eqeqeq: false */
-/* global ajaxurl, wpAjax */
+/* global ajaxurl */
 
-/**
- * The functions and classes in that code are a straight cut-and-paste out of
- * /wp-admin/js/post.js, coupled with Press This' usage of the post_tags_meta_box()
- * PHP function.
- *
- * If Press This makes it into core, we can refactor that code out of post.js and
- * make it more reusable, as well as improve it to work better, everywhere.
- *
- * Copied-and-pasted instead of enqueuing post.js because the latter has much more,
- * and has processing instead of just functions/classes.
- */
 var tagBox, array_unique_noempty;
 
 ( function( $ ) {
@@ -28,7 +17,7 @@ var tagBox, array_unique_noempty;
 		} );
 
 		return out;
-	}
+	};
 	
 	tagBox = {
 		clean : function(tags) {
@@ -46,7 +35,7 @@ var tagBox, array_unique_noempty;
 				num = id.split('-check-num-')[1],
 				taxbox = $(el).closest('.tagsdiv'),
 				thetags = taxbox.find('.the-tags'),
-				comma = window.tagsBoxL10n.tagDelimiter;
+				comma = window.tagsBoxL10n.tagDelimiter,
 				current_tags = thetags.val().split( comma ),
 				new_tags = [];