diff --git a/wp-admin/js/customize-controls.js b/wp-admin/js/customize-controls.js
index 0ea60ceee2..66d63bd13c 100644
--- a/wp-admin/js/customize-controls.js
+++ b/wp-admin/js/customize-controls.js
@@ -1,6 +1,6 @@
 /* globals _wpCustomizeHeader, _wpMediaViewsL10n */
 (function( exports, $ ){
-	var bubbleChildValueChanges, Container, focus, isKeydownButNotEnterEvent, areElementListsEqual, api = wp.customize;
+	var bubbleChildValueChanges, Container, focus, isKeydownButNotEnterEvent, areElementListsEqual, prioritySort, api = wp.customize;
 
 	// @todo Move private helper functions to wp.customize.utils so they can be unit tested
 
@@ -77,6 +77,23 @@
 		}
 	};
 
+	/**
+	 * Stable sort for Panels, Sections, and Controls.
+	 *
+	 * If a.priority() === b.priority(), then sort by their respective params.instanceNumber.
+	 *
+	 * @param {(wp.customize.Panel|wp.customize.Section|wp.customize.Control)} a
+	 * @param {(wp.customize.Panel|wp.customize.Section|wp.customize.Control)} b
+	 * @returns {Number}
+	 */
+	prioritySort = function ( a, b ) {
+		if ( a.priority() === b.priority() && typeof a.params.instanceNumber === 'number' && typeof b.params.instanceNumber === 'number' ) {
+			return a.params.instanceNumber - b.params.instanceNumber;
+		} else {
+			return a.priority() - b.priority();
+		}
+	};
+
 	/**
 	 * Return whether the supplied Event object is for a keydown event but not the Enter key.
 	 *
@@ -176,9 +193,7 @@
 					children.push( child );
 				}
 			} );
-			children.sort( function ( a, b ) {
-				return a.priority() - b.priority();
-			} );
+			children.sort( prioritySort );
 			return children;
 		},
 
@@ -1952,9 +1967,7 @@
 			} );
 
 			// Sort the root panels and sections
-			rootNodes.sort( function ( a, b ) {
-				return a.priority() - b.priority();
-			} );
+			rootNodes.sort( prioritySort );
 			rootContainers = _.pluck( rootNodes, 'container' );
 			appendContainer = $( '#customize-theme-controls' ).children( 'ul' ); // @todo This should be defined elsewhere, and to be configurable
 			if ( ! areElementListsEqual( rootContainers, appendContainer.children() ) ) {
diff --git a/wp-admin/js/customize-controls.min.js b/wp-admin/js/customize-controls.min.js
index 125fa49305..e060df8c8a 100644
--- a/wp-admin/js/customize-controls.min.js
+++ b/wp-admin/js/customize-controls.min.js
@@ -1 +1 @@
-!function(a,b){var c,d,e,f,g,h=wp.customize;h.Setting=h.Value.extend({initialize:function(a,b,c){h.Value.prototype.initialize.call(this,b,c),this.id=a,this.transport=this.transport||"refresh",this.bind(this.preview)},preview:function(){switch(this.transport){case"refresh":return this.previewer.refresh();case"postMessage":return this.previewer.send("setting",[this.id,this()])}}}),c=function(a,c){b.each(c,function(b,c){a[c].bind(function(b,c){a.parent&&b!==c&&a.parent.trigger("change",a)})})},e=function(a){var b,c,d;b=this,a=a||{},d=function(){b.container.find(":focusable:first").focus(),b.container[0].scrollIntoView(!0)},a.completeCallback?(c=a.completeCallback,a.completeCallback=function(){d(),c()}):a.completeCallback=d,b.expand?b.expand(a):a.completeCallback()},f=function(a){return"keydown"===a.type&&13!==a.which},g=function(a,c){var d=a.length===c.length&&-1===_.map(_.zip(a,c),function(a){return b(a[0]).is(a[1])}).indexOf(!1);return d},d=h.Class.extend({defaultActiveArguments:{duration:"fast"},defaultExpandedArguments:{duration:"fast"},initialize:function(a,d){var e=this;e.id=a,e.params={},b.extend(e,d||{}),e.container=b(e.params.content),e.deferred={ready:new b.Deferred},e.priority=new h.Value,e.active=new h.Value,e.activeArgumentsQueue=[],e.expanded=new h.Value,e.expandedArgumentsQueue=[],e.active.bind(function(a){var c=e.activeArgumentsQueue.shift();c=b.extend({},e.defaultActiveArguments,c),a=a&&e.isContextuallyActive(),e.onChangeActive(a,c)}),e.expanded.bind(function(a){var c=e.expandedArgumentsQueue.shift();c=b.extend({},e.defaultExpandedArguments,c),e.onChangeExpanded(a,c)}),e.attachEvents(),c(e,["priority","active"]),e.priority.set(isNaN(e.params.priority)?100:e.params.priority),e.active.set(e.params.active),e.expanded.set(!1)},ready:function(){},_children:function(a,b){var c=this,d=[];return h[b].each(function(b){b[a].get()===c.id&&d.push(b)}),d.sort(function(a,b){return a.priority()-b.priority()}),d},isContextuallyActive:function(){throw new Error("Must override with subclass.")},onChangeActive:function(a,b){var c="resolved"===h.previewer.deferred.active.state()?b.duration:0;a?this.container.stop(!0,!0).slideDown(c,b.completeCallback):this.container.stop(!0,!0).slideUp(c,b.completeCallback)},_toggleActive:function(a,b){var c=this;return b=b||{},a&&this.active.get()||!a&&!this.active.get()?(b.unchanged=!0,c.onChangeActive(c.active.get(),b),!1):(b.unchanged=!1,this.activeArgumentsQueue.push(b),this.active.set(a),!0)},activate:function(a){return this._toggleActive(!0,a)},deactivate:function(a){return this._toggleActive(!1,a)},onChangeExpanded:function(){throw new Error("Must override with subclass.")},_toggleExpanded:function(a,b){var c=this;return b=b||{},a&&this.expanded.get()||!a&&!this.expanded.get()?(b.unchanged=!0,c.onChangeExpanded(c.expanded.get(),b),!1):(b.unchanged=!1,this.expandedArgumentsQueue.push(b),this.expanded.set(a),!0)},expand:function(a){return this._toggleExpanded(!0,a)},collapse:function(a){return this._toggleExpanded(!1,a)},focus:e}),h.Section=d.extend({initialize:function(a,e){var f=this;d.prototype.initialize.call(f,a,e),f.id=a,f.panel=new h.Value,f.panel.bind(function(a){b(f.container).toggleClass("control-subsection",!!a)}),f.panel.set(f.params.panel||""),c(f,["panel"]),f.embed(),f.deferred.ready.done(function(){f.ready()})},embed:function(){var a,c=this;a=function(a){var d;a?h.panel(a,function(a){a.deferred.ready.done(function(){d=a.container.find("ul:first"),c.container.parent().is(d)||d.append(c.container),c.deferred.ready.resolve()})}):(d=b("#customize-theme-controls").children("ul"),c.container.parent().is(d)||d.append(c.container),c.deferred.ready.resolve())},c.panel.bind(a),a(c.panel.get())},attachEvents:function(){var a=this;a.container.find(".accordion-section-title").on("click keydown",function(b){f(b)||(b.preventDefault(),a.expanded()?a.collapse():a.expand())})},isContextuallyActive:function(){var a=this,b=a.controls(),c=0;return _(b).each(function(a){a.active()&&(c+=1)}),0!==c},controls:function(){return this._children("section","control")},onChangeExpanded:function(a,b){var c,d=this,e=d.container.find(".accordion-section-content");a?(c=b.unchanged?b.completeCallback:function(){e.stop().slideDown(b.duration,b.completeCallback),d.container.addClass("open")},b.allowMultiple||h.section.each(function(a){a!==d&&a.collapse({duration:b.duration})}),d.panel()?h.panel(d.panel()).expand({duration:b.duration,completeCallback:c}):c()):(d.container.removeClass("open"),e.slideUp(b.duration,b.completeCallback))}}),h.Panel=d.extend({initialize:function(a,b){var c=this;d.prototype.initialize.call(c,a,b),c.embed(),c.deferred.ready.done(function(){c.ready()})},embed:function(){var a=this,c=b("#customize-theme-controls > ul");a.container.parent().is(c)||c.append(a.container),a.deferred.ready.resolve()},attachEvents:function(){var a,b=this;b.container.find(".accordion-section-title").on("click keydown",function(a){f(a)||(a.preventDefault(),b.expanded()||b.expand())}),a=b.container.find(".panel-meta:first"),a.find("> .accordion-section-title").on("click keydown",function(c){if(!f(c)&&(c.preventDefault(),!a.hasClass("cannot-expand"))){var d=a.find(".accordion-section-content:first");a.hasClass("open")?(a.toggleClass("open"),d.slideUp(b.defaultExpandedArguments.duration)):(d.slideDown(b.defaultExpandedArguments.duration),a.toggleClass("open"))}})},sections:function(){return this._children("panel","section")},isContextuallyActive:function(){var a=this,b=a.sections(),c=0;return _(b).each(function(a){a.active()&&a.isContextuallyActive()&&(c+=1)}),0!==c},onChangeExpanded:function(a,b){if(b.unchanged)return void(b.completeCallback&&b.completeCallback());var c,d,e=this,f=e.container.closest(".accordion-section"),g=f.closest(".wp-full-overlay"),i=f.closest(".accordion-container"),j=i.find(".open"),k=g.find("#customize-theme-controls > ul > .accordion-section > .accordion-section-title").add("#customize-info > .accordion-section-title"),l=g.find(".control-panel-back"),m=f.find(".accordion-section-title").first(),n=f.find(".control-panel-content");a?(h.section.each(function(a){a.panel()||a.collapse({duration:0})}),h.panel.each(function(a){e!==a&&a.collapse({duration:0})}),n.show(0,function(){c=n.offset().top,d=i.scrollTop(),n.css("margin-top",45-c-d),f.addClass("current-panel"),g.addClass("in-sub-panel"),i.scrollTop(0),b.completeCallback&&b.completeCallback()}),k.attr("tabindex","-1"),l.attr("tabindex","0"),l.focus()):(j.removeClass("open"),f.removeClass("current-panel"),g.removeClass("in-sub-panel"),n.delay(180).hide(0,function(){n.css("margin-top","inherit"),b.completeCallback&&b.completeCallback()}),k.attr("tabindex","0"),l.attr("tabindex","-1"),m.focus(),i.scrollTop(0))}}),h.Control=h.Class.extend({defaultActiveArguments:{duration:"fast"},initialize:function(a,d){var e,f,g,i=this;i.params={},b.extend(i,d||{}),i.id=a,i.selector="#customize-control-"+a.replace(/\]/g,"").replace(/\[/g,"-"),i.templateSelector="customize-control-"+i.params.type+"-content",i.container=b(i.params.content?i.params.content:i.selector),i.deferred={ready:new b.Deferred},i.section=new h.Value,i.priority=new h.Value,i.active=new h.Value,i.activeArgumentsQueue=[],i.elements=[],e=i.container.find("[data-customize-setting-link]"),f={},e.each(function(){var a,c=b(this);if(c.is(":radio")){if(a=c.prop("name"),f[a])return;f[a]=!0,c=e.filter('[name="'+a+'"]')}h(c.data("customizeSettingLink"),function(a){var b=new h.Element(c);i.elements.push(b),b.sync(a),b.set(a())})}),i.active.bind(function(a){var c=i.activeArgumentsQueue.shift();c=b.extend({},i.defaultActiveArguments,c),i.onChangeActive(a,c)}),i.section.set(i.params.section),i.priority.set(isNaN(i.params.priority)?10:i.params.priority),i.active.set(i.params.active),c(i,["section","priority","active"]),g=b.map(i.params.settings,function(a){return a}),h.apply(h,g.concat(function(){var a;i.settings={};for(a in i.params.settings)i.settings[a]=h(i.params.settings[a]);i.setting=i.settings["default"]||null,i.embed()})),i.deferred.ready.done(function(){i.ready()})},embed:function(){var a,b=this;a=function(a){var c;a&&h.section(a,function(a){a.deferred.ready.done(function(){c=a.container.find("ul:first"),b.container.parent().is(c)||(c.append(b.container),b.renderContent()),b.deferred.ready.resolve()})})},b.section.bind(a),a(b.section.get())},ready:function(){},expand:function(a){h.section(this.section()).expand(a)},focus:e,onChangeActive:function(a,b){a?this.container.slideDown(b.duration,b.completeCallback):this.container.slideUp(b.duration,b.completeCallback)},toggle:function(a){return this.onChangeActive(a,this.defaultActiveArguments)},activate:d.prototype.activate,deactivate:d.prototype.deactivate,dropdownInit:function(){var a=this,b=this.container.find(".dropdown-status"),c=this.params,d=!1,e=function(a){"string"==typeof a&&c.statuses&&c.statuses[a]?b.html(c.statuses[a]).show():b.hide()};this.container.on("click keydown",".dropdown",function(b){f(b)||(b.preventDefault(),d||a.container.toggleClass("open"),a.container.hasClass("open")&&a.container.parent().parent().find("li.library-selected").focus(),d=!0,setTimeout(function(){d=!1},400))}),this.setting.bind(e),e(this.setting())},renderContent:function(){var a,c=this;0!==b("#tmpl-"+c.templateSelector).length&&(a=wp.template(c.templateSelector),a&&c.container&&c.container.append(a(c.params)))}}),h.ColorControl=h.Control.extend({ready:function(){var a=this,b=this.container.find(".color-picker-hex");b.val(a.setting()).wpColorPicker({change:function(){a.setting.set(b.wpColorPicker("color"))},clear:function(){a.setting.set(!1)}}),this.setting.bind(function(a){b.val(a),b.wpColorPicker("color",a)})}}),h.UploadControl=h.Control.extend({ready:function(){var a=this;this.params.removed=this.params.removed||"",this.success=b.proxy(this.success,this),this.uploader=b.extend({container:this.container,browser:this.container.find(".upload"),dropzone:this.container.find(".upload-dropzone"),success:this.success,plupload:{},params:{}},this.uploader||{}),a.params.extensions&&(a.uploader.plupload.filters=[{title:h.l10n.allowedFiles,extensions:a.params.extensions}]),a.params.context&&(a.uploader.params["post_data[context]"]=this.params.context),h.settings.theme.stylesheet&&(a.uploader.params["post_data[theme]"]=h.settings.theme.stylesheet),this.uploader=new wp.Uploader(this.uploader),this.remover=this.container.find(".remove"),this.remover.on("click keydown",function(b){f(b)||(a.setting.set(a.params.removed),b.preventDefault())}),this.removerVisibility=b.proxy(this.removerVisibility,this),this.setting.bind(this.removerVisibility),this.removerVisibility(this.setting.get())},success:function(a){this.setting.set(a.get("url"))},removerVisibility:function(a){this.remover.toggle(a!=this.params.removed)}}),h.ImageControl=h.UploadControl.extend({ready:function(){var a,c=this;this.uploader={init:function(){var a,b;this.supports.dragdrop||(a=c.container.find(".upload-fallback"),b=a.children().detach(),this.browser.detach().empty().append(b),a.append(this.browser).show())}},h.UploadControl.prototype.ready.call(this),this.thumbnail=this.container.find(".preview-thumbnail img"),this.thumbnailSrc=b.proxy(this.thumbnailSrc,this),this.setting.bind(this.thumbnailSrc),this.library=this.container.find(".library"),this.tabs={},a=this.library.find(".library-content"),this.library.children("ul").children("li").each(function(){var d=b(this),e=d.data("customizeTab"),f=a.filter('[data-customize-tab="'+e+'"]');c.tabs[e]={both:d.add(f),link:d,panel:f}}),this.library.children("ul").on("click keydown","li",function(a){if(!f(a)){var d=b(this).data("customizeTab"),e=c.tabs[d];a.preventDefault(),e.link.hasClass("library-selected")||(c.selected.both.removeClass("library-selected"),c.selected=e,c.selected.both.addClass("library-selected"))}}),this.library.on("click keydown","a",function(a){if(!f(a)){var d=b(this).data("customizeImageValue");d&&(c.setting.set(d),a.preventDefault())}}),this.tabs.uploaded&&(this.tabs.uploaded.target=this.library.find(".uploaded-target"),this.tabs.uploaded.panel.find(".thumbnail").length||this.tabs.uploaded.both.addClass("hidden")),a.each(function(){var a=c.tabs[b(this).data("customizeTab")];return a.link.hasClass("hidden")?void 0:(c.selected=a,a.both.addClass("library-selected"),!1)}),this.dropdownInit()},success:function(a){h.UploadControl.prototype.success.call(this,a),this.tabs.uploaded&&this.tabs.uploaded.target.length&&(this.tabs.uploaded.both.removeClass("hidden"),a.element=b('<a href="#" class="thumbnail"></a>').data("customizeImageValue",a.get("url")).append('<img src="'+a.get("url")+'" />').appendTo(this.tabs.uploaded.target))},thumbnailSrc:function(a){/^(https?:)?\/\//.test(a)?this.thumbnail.prop("src",a).show():this.thumbnail.hide()}}),h.HeaderControl=h.Control.extend({ready:function(){this.btnRemove=b("#customize-control-header_image .actions .remove"),this.btnNew=b("#customize-control-header_image .actions .new"),_.bindAll(this,"openMedia","removeImage"),this.btnNew.on("click",this.openMedia),this.btnRemove.on("click",this.removeImage),h.HeaderTool.currentHeader=new h.HeaderTool.ImageModel,new h.HeaderTool.CurrentView({model:h.HeaderTool.currentHeader,el:".current .container"}),new h.HeaderTool.ChoiceListView({collection:h.HeaderTool.UploadsList=new h.HeaderTool.ChoiceList,el:".choices .uploaded .list"}),new h.HeaderTool.ChoiceListView({collection:h.HeaderTool.DefaultsList=new h.HeaderTool.DefaultsList,el:".choices .default .list"}),h.HeaderTool.combinedList=h.HeaderTool.CombinedList=new h.HeaderTool.CombinedList([h.HeaderTool.UploadsList,h.HeaderTool.DefaultsList])},calculateImageSelectOptions:function(a,b){var c,d,e,f,g,i,j=parseInt(_wpCustomizeHeader.data.width,10),k=parseInt(_wpCustomizeHeader.data.height,10),l=!!parseInt(_wpCustomizeHeader.data["flex-width"],10),m=!!parseInt(_wpCustomizeHeader.data["flex-height"],10);return g=a.get("width"),f=a.get("height"),this.headerImage=new h.HeaderTool.ImageModel,this.headerImage.set({themeWidth:j,themeHeight:k,themeFlexWidth:l,themeFlexHeight:m,imageWidth:g,imageHeight:f}),b.set("canSkipCrop",!this.headerImage.shouldBeCropped()),c=j/k,d=g,e=f,d/e>c?(k=e,j=k*c):(j=d,k=j/c),i={handles:!0,keys:!0,instance:!0,persistent:!0,imageWidth:g,imageHeight:f,x1:0,y1:0,x2:j,y2:k},m===!1&&l===!1&&(i.aspectRatio=j+":"+k),m===!1&&(i.maxHeight=k),l===!1&&(i.maxWidth=j),i},openMedia:function(a){var b=_wpMediaViewsL10n;a.preventDefault(),this.frame=wp.media({button:{text:b.selectAndCrop,close:!1},states:[new wp.media.controller.Library({title:b.chooseImage,library:wp.media.query({type:"image"}),multiple:!1,priority:20,suggestedWidth:_wpCustomizeHeader.data.width,suggestedHeight:_wpCustomizeHeader.data.height}),new wp.media.controller.Cropper({imgSelectOptions:this.calculateImageSelectOptions})]}),this.frame.on("select",this.onSelect,this),this.frame.on("cropped",this.onCropped,this),this.frame.on("skippedcrop",this.onSkippedCrop,this),this.frame.open()},onSelect:function(){this.frame.setState("cropper")},onCropped:function(a){var b=a.post_content,c=a.attachment_id,d=a.width,e=a.height;this.setImageFromURL(b,c,d,e)},onSkippedCrop:function(a){var b=a.get("url"),c=a.get("width"),d=a.get("height");this.setImageFromURL(b,a.id,c,d)},setImageFromURL:function(a,b,c,d){var e,f={};f.url=a,f.thumbnail_url=a,f.timestamp=_.now(),b&&(f.attachment_id=b),c&&(f.width=c),d&&(f.height=d),e=new h.HeaderTool.ImageModel({header:f,choice:a.split("/").pop()}),h.HeaderTool.UploadsList.add(e),h.HeaderTool.currentHeader.set(e.toJSON()),e.save(),e.importImage()},removeImage:function(){h.HeaderTool.currentHeader.trigger("hide"),h.HeaderTool.CombinedList.trigger("control:removeImage")}}),h.defaultConstructor=h.Setting,h.control=new h.Values({defaultConstructor:h.Control}),h.section=new h.Values({defaultConstructor:h.Section}),h.panel=new h.Values({defaultConstructor:h.Panel}),h.PreviewFrame=h.Messenger.extend({sensitivity:2e3,initialize:function(a,c){var d=b.Deferred();d.promise(this),this.container=a.container,this.signature=a.signature,b.extend(a,{channel:h.PreviewFrame.uuid()}),h.Messenger.prototype.initialize.call(this,a,c),this.add("previewUrl",a.previewUrl),this.query=b.extend(a.query||{},{customize_messenger_channel:this.channel()}),this.run(d)},run:function(a){var c=this,d=!1,e=!1;this._ready&&this.unbind("ready",this._ready),this._ready=function(){e=!0,d&&a.resolveWith(c)},this.bind("ready",this._ready),this.bind("ready",function(a){if(a){var c={panel:a.activePanels,section:a.activeSections,control:a.activeControls};b.each(c,function(a,c){c&&b.each(c,function(b,c){var d=h[a](b);d&&d.active(c)})})}}),this.request=b.ajax(this.previewUrl(),{type:"POST",data:this.query,xhrFields:{withCredentials:!0}}),this.request.fail(function(){a.rejectWith(c,["request failure"])}),this.request.done(function(f){var g,h=c.request.getResponseHeader("Location"),i=c.signature;return h&&h!==c.previewUrl()?void a.rejectWith(c,["redirect",h]):"0"===f?void c.login(a):"-1"===f?void a.rejectWith(c,["cheatin"]):(g=f.lastIndexOf(i),-1===g||g<f.lastIndexOf("</html>")?void a.rejectWith(c,["unsigned"]):(f=f.slice(0,g)+f.slice(g+i.length),c.iframe=b("<iframe />").appendTo(c.container),c.iframe.one("load",function(){d=!0,e?a.resolveWith(c):setTimeout(function(){a.rejectWith(c,["ready timeout"])},c.sensitivity)}),c.targetWindow(c.iframe[0].contentWindow),c.targetWindow().document.open(),c.targetWindow().document.write(f),void c.targetWindow().document.close()))})},login:function(a){var c,d=this;return c=function(){a.rejectWith(d,["logged out"])},this.triedLogin?c():void b.get(h.settings.url.ajax,{action:"logged-in"}).fail(c).done(function(e){var f;"1"!==e&&c(),f=b('<iframe src="'+d.previewUrl()+'" />').hide(),f.appendTo(d.container),f.load(function(){d.triedLogin=!0,f.remove(),d.run(a)})})},destroy:function(){h.Messenger.prototype.destroy.call(this),this.request.abort(),this.iframe&&this.iframe.remove(),delete this.request,delete this.iframe,delete this.targetWindow}}),function(){var a=0;h.PreviewFrame.uuid=function(){return"preview-"+a++}}(),h.Previewer=h.Messenger.extend({refreshBuffer:250,initialize:function(a,c){var 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keydown",function(b){f(b)||(a.setting.set(a.params.removed),b.preventDefault())}),this.removerVisibility=b.proxy(this.removerVisibility,this),this.setting.bind(this.removerVisibility),this.removerVisibility(this.setting.get())},success:function(a){this.setting.set(a.get("url"))},removerVisibility:function(a){this.remover.toggle(a!=this.params.removed)}}),i.ImageControl=i.UploadControl.extend({ready:function(){var a,c=this;this.uploader={init:function(){var a,b;this.supports.dragdrop||(a=c.container.find(".upload-fallback"),b=a.children().detach(),this.browser.detach().empty().append(b),a.append(this.browser).show())}},i.UploadControl.prototype.ready.call(this),this.thumbnail=this.container.find(".preview-thumbnail img"),this.thumbnailSrc=b.proxy(this.thumbnailSrc,this),this.setting.bind(this.thumbnailSrc),this.library=this.container.find(".library"),this.tabs={},a=this.library.find(".library-content"),this.library.children("ul").children("li").each(function(){var d=b(this),e=d.data("customizeTab"),f=a.filter('[data-customize-tab="'+e+'"]');c.tabs[e]={both:d.add(f),link:d,panel:f}}),this.library.children("ul").on("click keydown","li",function(a){if(!f(a)){var d=b(this).data("customizeTab"),e=c.tabs[d];a.preventDefault(),e.link.hasClass("library-selected")||(c.selected.both.removeClass("library-selected"),c.selected=e,c.selected.both.addClass("library-selected"))}}),this.library.on("click keydown","a",function(a){if(!f(a)){var d=b(this).data("customizeImageValue");d&&(c.setting.set(d),a.preventDefault())}}),this.tabs.uploaded&&(this.tabs.uploaded.target=this.library.find(".uploaded-target"),this.tabs.uploaded.panel.find(".thumbnail").length||this.tabs.uploaded.both.addClass("hidden")),a.each(function(){var a=c.tabs[b(this).data("customizeTab")];return a.link.hasClass("hidden")?void 0:(c.selected=a,a.both.addClass("library-selected"),!1)}),this.dropdownInit()},success:function(a){i.UploadControl.prototype.success.call(this,a),this.tabs.uploaded&&this.tabs.uploaded.target.length&&(this.tabs.uploaded.both.removeClass("hidden"),a.element=b('<a href="#" class="thumbnail"></a>').data("customizeImageValue",a.get("url")).append('<img src="'+a.get("url")+'" />').appendTo(this.tabs.uploaded.target))},thumbnailSrc:function(a){/^(https?:)?\/\//.test(a)?this.thumbnail.prop("src",a).show():this.thumbnail.hide()}}),i.HeaderControl=i.Control.extend({ready:function(){this.btnRemove=b("#customize-control-header_image .actions .remove"),this.btnNew=b("#customize-control-header_image .actions .new"),_.bindAll(this,"openMedia","removeImage"),this.btnNew.on("click",this.openMedia),this.btnRemove.on("click",this.removeImage),i.HeaderTool.currentHeader=new i.HeaderTool.ImageModel,new i.HeaderTool.CurrentView({model:i.HeaderTool.currentHeader,el:".current .container"}),new i.HeaderTool.ChoiceListView({collection:i.HeaderTool.UploadsList=new i.HeaderTool.ChoiceList,el:".choices .uploaded .list"}),new i.HeaderTool.ChoiceListView({collection:i.HeaderTool.DefaultsList=new i.HeaderTool.DefaultsList,el:".choices .default .list"}),i.HeaderTool.combinedList=i.HeaderTool.CombinedList=new i.HeaderTool.CombinedList([i.HeaderTool.UploadsList,i.HeaderTool.DefaultsList])},calculateImageSelectOptions:function(a,b){var c,d,e,f,g,h,j=parseInt(_wpCustomizeHeader.data.width,10),k=parseInt(_wpCustomizeHeader.data.height,10),l=!!parseInt(_wpCustomizeHeader.data["flex-width"],10),m=!!parseInt(_wpCustomizeHeader.data["flex-height"],10);return g=a.get("width"),f=a.get("height"),this.headerImage=new i.HeaderTool.ImageModel,this.headerImage.set({themeWidth:j,themeHeight:k,themeFlexWidth:l,themeFlexHeight:m,imageWidth:g,imageHeight:f}),b.set("canSkipCrop",!this.headerImage.shouldBeCropped()),c=j/k,d=g,e=f,d/e>c?(k=e,j=k*c):(j=d,k=j/c),h={handles:!0,keys:!0,instance:!0,persistent:!0,imageWidth:g,imageHeight:f,x1:0,y1:0,x2:j,y2:k},m===!1&&l===!1&&(h.aspectRatio=j+":"+k),m===!1&&(h.maxHeight=k),l===!1&&(h.maxWidth=j),h},openMedia:function(a){var b=_wpMediaViewsL10n;a.preventDefault(),this.frame=wp.media({button:{text:b.selectAndCrop,close:!1},states:[new wp.media.controller.Library({title:b.chooseImage,library:wp.media.query({type:"image"}),multiple:!1,priority:20,suggestedWidth:_wpCustomizeHeader.data.width,suggestedHeight:_wpCustomizeHeader.data.height}),new wp.media.controller.Cropper({imgSelectOptions:this.calculateImageSelectOptions})]}),this.frame.on("select",this.onSelect,this),this.frame.on("cropped",this.onCropped,this),this.frame.on("skippedcrop",this.onSkippedCrop,this),this.frame.open()},onSelect:function(){this.frame.setState("cropper")},onCropped:function(a){var b=a.post_content,c=a.attachment_id,d=a.width,e=a.height;this.setImageFromURL(b,c,d,e)},onSkippedCrop:function(a){var b=a.get("url"),c=a.get("width"),d=a.get("height");this.setImageFromURL(b,a.id,c,d)},setImageFromURL:function(a,b,c,d){var e,f={};f.url=a,f.thumbnail_url=a,f.timestamp=_.now(),b&&(f.attachment_id=b),c&&(f.width=c),d&&(f.height=d),e=new i.HeaderTool.ImageModel({header:f,choice:a.split("/").pop()}),i.HeaderTool.UploadsList.add(e),i.HeaderTool.currentHeader.set(e.toJSON()),e.save(),e.importImage()},removeImage:function(){i.HeaderTool.currentHeader.trigger("hide"),i.HeaderTool.CombinedList.trigger("control:removeImage")}}),i.defaultConstructor=i.Setting,i.control=new i.Values({defaultConstructor:i.Control}),i.section=new i.Values({defaultConstructor:i.Section}),i.panel=new i.Values({defaultConstructor:i.Panel}),i.PreviewFrame=i.Messenger.extend({sensitivity:2e3,initialize:function(a,c){var d=b.Deferred();d.promise(this),this.container=a.container,this.signature=a.signature,b.extend(a,{channel:i.PreviewFrame.uuid()}),i.Messenger.prototype.initialize.call(this,a,c),this.add("previewUrl",a.previewUrl),this.query=b.extend(a.query||{},{customize_messenger_channel:this.channel()}),this.run(d)},run:function(a){var c=this,d=!1,e=!1;this._ready&&this.unbind("ready",this._ready),this._ready=function(){e=!0,d&&a.resolveWith(c)},this.bind("ready",this._ready),this.bind("ready",function(a){if(a){var c={panel:a.activePanels,section:a.activeSections,control:a.activeControls};b.each(c,function(a,c){c&&b.each(c,function(b,c){var d=i[a](b);d&&d.active(c)})})}}),this.request=b.ajax(this.previewUrl(),{type:"POST",data:this.query,xhrFields:{withCredentials:!0}}),this.request.fail(function(){a.rejectWith(c,["request failure"])}),this.request.done(function(f){var g,h=c.request.getResponseHeader("Location"),i=c.signature;return h&&h!==c.previewUrl()?void a.rejectWith(c,["redirect",h]):"0"===f?void c.login(a):"-1"===f?void a.rejectWith(c,["cheatin"]):(g=f.lastIndexOf(i),-1===g||g<f.lastIndexOf("</html>")?void a.rejectWith(c,["unsigned"]):(f=f.slice(0,g)+f.slice(g+i.length),c.iframe=b("<iframe />").appendTo(c.container),c.iframe.one("load",function(){d=!0,e?a.resolveWith(c):setTimeout(function(){a.rejectWith(c,["ready timeout"])},c.sensitivity)}),c.targetWindow(c.iframe[0].contentWindow),c.targetWindow().document.open(),c.targetWindow().document.write(f),void c.targetWindow().document.close()))})},login:function(a){var c,d=this;return c=function(){a.rejectWith(d,["logged out"])},this.triedLogin?c():void b.get(i.settings.url.ajax,{action:"logged-in"}).fail(c).done(function(e){var f;"1"!==e&&c(),f=b('<iframe src="'+d.previewUrl()+'" />').hide(),f.appendTo(d.container),f.load(function(){d.triedLogin=!0,f.remove(),d.run(a)})})},destroy:function(){i.Messenger.prototype.destroy.call(this),this.request.abort(),this.iframe&&this.iframe.remove(),delete this.request,delete this.iframe,delete this.targetWindow}}),function(){var a=0;i.PreviewFrame.uuid=function(){return"preview-"+a++}}(),i.Previewer=i.Messenger.extend({refreshBuffer:250,initialize:function(a,c){var d=this,e=/^https?/;b.extend(this,c||{}),this.deferred={active:b.Deferred()},this.refresh=function(a){var b,c=a.refresh,d=function(){b=null,c.call(a)};return function(){if("number"!=typeof b){if(!a.loading)return d();a.abort()}clearTimeout(b),b=setTimeout(d,a.refreshBuffer)}}(this),this.container=i.ensure(a.container),this.allowedUrls=a.allowedUrls,this.signature=a.signature,a.url=window.location.href,i.Messenger.prototype.initialize.call(this,a),this.add("scheme",this.origin()).link(this.origin).setter(function(a){var b=a.match(e);return b?b[0]:""}),this.add("previewUrl",a.previewUrl).setter(function(a){var c;return/\/wp-admin(\/|$)/.test(a.replace(/[#?].*$/,""))?null:(b.each([a.replace(e,d.scheme()),a],function(a,e){return b.each(d.allowedUrls,function(a,b){var d;return b=b.replace(/\/+$/,""),d=e.replace(b,""),0===e.indexOf(b)&&/^([/#?]|$)/.test(d)?(c=e,!1):void 0}),c?!1:void 0}),c?c:null)}),this.previewUrl.bind(this.refresh),this.scroll=0,this.bind("scroll",function(a){this.scroll=a}),this.bind("url",this.previewUrl)},query:function(){},abort:function(){this.loading&&(this.loading.destroy(),delete this.loading)},refresh:function(){var a=this;this.abort(),this.loading=new i.PreviewFrame({url:this.url(),previewUrl:this.previewUrl(),query:this.query()||{},container:this.container,signature:this.signature}),this.loading.done(function(){this.bind("synced",function(){a.preview&&a.preview.destroy(),a.preview=this,delete a.loading,a.targetWindow(this.targetWindow()),a.channel(this.channel()),a.deferred.active.resolve(),a.send("active")}),this.send("sync",{scroll:a.scroll,settings:i.get()})}),this.loading.fail(function(b,c){"redirect"===b&&c&&a.previewUrl(c),"logged out"===b&&(a.preview&&(a.preview.destroy(),delete a.preview),a.login().done(a.refresh)),"cheatin"===b&&a.cheatin()})},login:function(){var a,c,d,e=this;return this._login?this._login:(a=b.Deferred(),this._login=a.promise(),c=new i.Messenger({channel:"login",url:i.settings.url.login}),d=b('<iframe src="'+i.settings.url.login+'" />').appendTo(this.container),c.targetWindow(d[0].contentWindow),c.bind("login",function(){d.remove(),c.destroy(),delete e._login,a.resolve()}),this._login)},cheatin:function(){b(document.body).empty().addClass("cheatin").append("<p>"+i.l10n.cheatin+"</p>")}}),i.controlConstructor={color:i.ColorControl,upload:i.UploadControl,image:i.ImageControl,header:i.HeaderControl},i.panelConstructor={},i.sectionConstructor={},b(function(){if(i.settings=window._wpCustomizeSettings,i.l10n=window._wpCustomizeControlsL10n,i.settings){if(!b.support.postMessage||!b.support.cors&&i.settings.isCrossDomain)return window.location=i.settings.url.fallback;var a,c,d=b(document.body),e=d.children(".wp-full-overlay"),j=b("#customize-info .theme-name.site-title"),k=b(".customize-controls-close"),l=b("#save");b("#customize-controls").on("keydown",function(a){var c=13===a.which,d=b(a.target);c&&(d.is("input:not([type=button])")||d.is("select"))&&a.preventDefault()}),b("#customize-info").find("> .accordion-section-title").on("click keydown",function(a){if(!f(a)){a.preventDefault();var c=b(this).parent(),d=c.find(".accordion-section-content:first");c.hasClass("cannot-expand")||(c.hasClass("open")?(c.toggleClass("open"),d.slideUp(i.Panel.prototype.defaultExpandedArguments.duration)):(d.slideDown(i.Panel.prototype.defaultExpandedArguments.duration),c.toggleClass("open")))}}),i.previewer=new i.Previewer({container:"#customize-preview",form:"#customize-controls",previewUrl:i.settings.url.preview,allowedUrls:i.settings.url.allowed,signature:"WP_CUSTOMIZER_SIGNATURE"},{nonce:i.settings.nonce,query:function(){var a={};return i.each(function(b,c){b._dirty&&(a[c]=b())}),{wp_customize:"on",theme:i.settings.theme.stylesheet,customized:JSON.stringify(a),nonce:this.nonce.preview}},save:function(){var a,c,e=this,f=b.extend(this.query(),{action:"customize_save",nonce:this.nonce.save}),g=i.state("processing");d.addClass("saving"),c=function(){var a=b.post(i.settings.url.ajax,f);i.trigger("save",a),a.always(function(){d.removeClass("saving")}),a.done(function(a){return"0"===a?(e.preview.iframe.hide(),void e.login().done(function(){e.save(),e.preview.iframe.show()})):"-1"===a?void e.cheatin():(i.each(function(a){a._dirty=!1}),void i.trigger("saved"))})},0===g()?c():(a=function(){0===g()&&(i.state.unbind("change",a),c())},i.state.bind("change",a))}}),i.previewer.bind("nonce",function(a){b.extend(this.nonce,a)}),b.each(i.settings.settings,function(a,b){i.create(a,a,b.value,{transport:b.transport,previewer:i.previewer})}),b.each(i.settings.panels,function(a,b){var c,d=i.panelConstructor[b.type]||i.Panel;c=new d(a,{params:b}),i.panel.add(a,c)}),b.each(i.settings.sections,function(a,b){var c,d=i.sectionConstructor[b.type]||i.Section;c=new d(a,{params:b}),i.section.add(a,c)}),b.each(i.settings.controls,function(a,b){var c,d=i.controlConstructor[b.type]||i.Control;c=new d(a,{params:b,previewer:i.previewer}),i.control.add(a,c)}),_.each(["panel","section","control"],function(a){var b,c=i.settings.autofocus[a];c&&i[a](c)&&(b=i[a](c),b.deferred.ready.done(function(){i.previewer.deferred.active.done(function(){b.focus()})}))}),i.reflowPaneContents=_.bind(function(){var a,c,d,e=[],f=!1;document.activeElement&&(c=b(document.activeElement)),i.panel.each(function(b){var c=b.sections(),d=_.pluck(c,"container");e.push(b),a=b.container.find("ul:first"),g(d,a.children("[id]"))||(_(c).each(function(b){a.append(b.container)}),f=!0)}),i.section.each(function(b){var c=b.controls(),d=_.pluck(c,"container");b.panel()||e.push(b),a=b.container.find("ul:first"),g(d,a.children("[id]"))||(_(c).each(function(b){a.append(b.container)}),f=!0)}),e.sort(h),d=_.pluck(e,"container"),a=b("#customize-theme-controls").children("ul"),g(d,a.children())||(_(e).each(function(b){a.append(b.container)}),f=!0),i.panel.each(function(a){var b=a.active();a.active.callbacks.fireWith(a.active,[b,b])}),i.section.each(function(a){var b=a.active();a.active.callbacks.fireWith(a.active,[b,b])}),f&&c&&c.focus()},i),i.bind("ready",i.reflowPaneContents),i.reflowPaneContents=_.debounce(i.reflowPaneContents,100),b([i.panel,i.section,i.control]).each(function(a,b){b.bind("add",i.reflowPaneContents),b.bind("change",i.reflowPaneContents),b.bind("remove",i.reflowPaneContents)}),i.previewer.previewUrl()?i.previewer.refresh():i.previewer.previewUrl(i.settings.url.home),function(){var a=new i.Values,b=a.create("saved"),c=a.create("activated"),d=a.create("processing");a.bind("change",function(){c()?b()?(l.val(i.l10n.saved).prop("disabled",!0),k.find(".screen-reader-text").text(i.l10n.close)):(l.val(i.l10n.save).prop("disabled",!1),k.find(".screen-reader-text").text(i.l10n.cancel)):(l.val(i.l10n.activate).prop("disabled",!1),k.find(".screen-reader-text").text(i.l10n.cancel))}),b(!0),c(i.settings.theme.active),d(0),i.bind("change",function(){a("saved").set(!1)}),i.bind("saved",function(){a("saved").set(!0),a("activated").set(!0)}),c.bind(function(a){a&&i.trigger("activated")}),i.state=a}(),l.click(function(a){i.previewer.save(),a.preventDefault()}).keydown(function(a){9!==a.which&&(13===a.which&&i.previewer.save(),a.preventDefault())}),b("#customize-header-actions").on("click keydown",".control-panel-back",function(a){f(a)||(a.preventDefault(),i.panel.each(function(a){a.collapse()}))}),k.keydown(function(a){9!==a.which&&(13===a.which&&this.click(),a.preventDefault())}),b(".upload-dropzone a.upload").keydown(function(a){13===a.which&&this.click()}),b(".collapse-sidebar").on("click keydown",function(a){f(a)||(e.toggleClass("collapsed").toggleClass("expanded"),a.preventDefault())}),j.length&&b("#customize-control-blogname input").on("input",function(){j.text(this.value)}),a=new i.Messenger({url:i.settings.url.parent,channel:"loader"}),a.bind("back",function(){k.on("click.customize-controls-close",function(b){b.preventDefault(),a.send("close")})}),b(window).on("beforeunload",function(){return i.state("saved")()?void 0:i.l10n.saveAlert}),b.each(["saved","change"],function(b,c){i.bind(c,function(){a.send(c)})}),i.bind("activated",function(){a.targetWindow()?a.send("activated",i.settings.url.activated):i.settings.url.activated&&(window.location=i.settings.url.activated)}),a.send("ready"),b.each({background_image:{controls:["background_repeat","background_position_x","background_attachment"],callback:function(a){return!!a}},show_on_front:{controls:["page_on_front","page_for_posts"],callback:function(a){return"page"===a}},header_textcolor:{controls:["header_textcolor"],callback:function(a){return"blank"!==a}}},function(a,c){i(a,function(a){b.each(c.controls,function(b,d){i.control(d,function(b){var d=function(a){b.container.toggle(c.callback(a))};d(a.get()),a.bind(d)})})})}),i.control("display_header_text",function(a){var b="";a.elements[0].unsync(i("header_textcolor")),a.element=new i.Element(a.container.find("input")),a.element.set("blank"!==a.setting()),a.element.bind(function(c){c||(b=i("header_textcolor").get()),a.setting.set(c?b:"blank")}),a.setting.bind(function(b){a.element.set("blank"!==b)})}),i.trigger("ready"),c=k,c.focus(),setTimeout(function(){c.focus()},200)}})}(wp,jQuery);
\ No newline at end of file
diff --git a/wp-includes/class-wp-customize-control.php b/wp-includes/class-wp-customize-control.php
index 2130f0c0de..7fe3c0f3c5 100644
--- a/wp-includes/class-wp-customize-control.php
+++ b/wp-includes/class-wp-customize-control.php
@@ -7,6 +7,27 @@
  * @since 3.4.0
  */
 class WP_Customize_Control {
+
+	/**
+	 * Incremented with each new class instantiation, then stored in $instance_number.
+	 *
+	 * Used when sorting two instances whose priorities are equal.
+	 *
+	 * @since 4.1.0
+	 * @access protected
+	 * @var int
+	 */
+	protected static $instance_count = 0;
+
+	/**
+	 * Order in which this instance was created in relation to other instances.
+	 *
+	 * @since 4.1.0
+	 * @access public
+	 * @var int
+	 */
+	public $instance_number;
+
 	/**
 	 * @access public
 	 * @var WP_Customize_Manager
@@ -127,6 +148,8 @@ class WP_Customize_Control {
 		if ( empty( $this->active_callback ) ) {
 			$this->active_callback = array( $this, 'active_callback' );
 		}
+		self::$instance_count += 1;
+		$this->instance_number = self::$instance_count;
 
 		// Process settings.
 		if ( empty( $this->settings ) ) {
@@ -218,13 +241,14 @@ class WP_Customize_Control {
 			$this->json['settings'][ $key ] = $setting->id;
 		}
 
-		$this->json['type']        = $this->type;
-		$this->json['priority']    = $this->priority;
-		$this->json['active']      = $this->active();
-		$this->json['section']     = $this->section;
-		$this->json['content']     = $this->get_content();
-		$this->json['label']       = $this->label;
+		$this->json['type'] = $this->type;
+		$this->json['priority'] = $this->priority;
+		$this->json['active'] = $this->active();
+		$this->json['section'] = $this->section;
+		$this->json['content'] = $this->get_content();
+		$this->json['label'] = $this->label;
 		$this->json['description'] = $this->description;
+		$this->json['instanceNumber'] = $this->instance_number;
 	}
 
 	/**
diff --git a/wp-includes/class-wp-customize-manager.php b/wp-includes/class-wp-customize-manager.php
index 371ea90fdc..987edc6e85 100644
--- a/wp-includes/class-wp-customize-manager.php
+++ b/wp-includes/class-wp-customize-manager.php
@@ -856,28 +856,27 @@ final class WP_Customize_Manager {
 	 * @since 4.1.0
 	 */
 	public function render_control_templates() {
-		foreach( $this->registered_control_types as $control_type ) {
+		foreach ( $this->registered_control_types as $control_type ) {
 			$control = new $control_type( $this, 'temp', array() );
 			$control->print_template();
 		}
 	}
 
-    /** 
-	 * Helper function to compare two objects by priority.
+	/**
+	 * Helper function to compare two objects by priority, ensuring sort stability via instance_number.
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param object $a Object A.
-	 * @param object $b Object B.
+	 * @param {WP_Customize_Panel|WP_Customize_Section|WP_Customize_Control} $a Object A.
+	 * @param {WP_Customize_Panel|WP_Customize_Section|WP_Customize_Control} $b Object B.
 	 * @return int
 	 */
 	protected final function _cmp_priority( $a, $b ) {
-		$ap = $a->priority;
-		$bp = $b->priority;
-
-		if ( $ap == $bp )
-			return 0;
-		return ( $ap > $bp ) ? 1 : -1;
+		if ( $a->priority === $b->priority ) {
+			return $a->instance_number - $a->instance_number;
+		} else {
+			return $a->priority - $b->priority;
+		}
 	}
 
 	/**
@@ -891,8 +890,8 @@ final class WP_Customize_Manager {
 	 */
 	public function prepare_controls() {
 
-		$this->controls = array_reverse( $this->controls );
 		$controls = array();
+		uasort( $this->controls, array( $this, '_cmp_priority' ) );
 
 		foreach ( $this->controls as $id => $control ) {
 			if ( ! isset( $this->sections[ $control->section ] ) || ! $control->check_capabilities() ) {
@@ -905,8 +904,6 @@ final class WP_Customize_Manager {
 		$this->controls = $controls;
 
 		// Prepare sections.
-		// Reversing makes uasort sort by time added when conflicts occur.
-		$this->sections = array_reverse( $this->sections );
 		uasort( $this->sections, array( $this, '_cmp_priority' ) );
 		$sections = array();
 
@@ -930,8 +927,6 @@ final class WP_Customize_Manager {
 		$this->sections = $sections;
 
 		// Prepare panels.
-		// Reversing makes uasort sort by time added when conflicts occur.
-		$this->panels = array_reverse( $this->panels );
 		uasort( $this->panels, array( $this, '_cmp_priority' ) );
 		$panels = array();
 
diff --git a/wp-includes/class-wp-customize-panel.php b/wp-includes/class-wp-customize-panel.php
index 201c4b914f..7a5b36453a 100644
--- a/wp-includes/class-wp-customize-panel.php
+++ b/wp-includes/class-wp-customize-panel.php
@@ -10,6 +10,26 @@
  */
 class WP_Customize_Panel {
 
+	/**
+	 * Incremented with each new class instantiation, then stored in $instance_number.
+	 *
+	 * Used when sorting two instances whose priorities are equal.
+	 *
+	 * @since 4.1.0
+	 * @access protected
+	 * @var int
+	 */
+	protected static $instance_count = 0;
+
+	/**
+	 * Order in which this instance was created in relation to other instances.
+	 *
+	 * @since 4.1.0
+	 * @access public
+	 * @var int
+	 */
+	public $instance_number;
+
 	/**
 	 * WP_Customize_Manager instance.
 	 *
@@ -128,6 +148,8 @@ class WP_Customize_Panel {
 		if ( empty( $this->active_callback ) ) {
 			$this->active_callback = array( $this, 'active_callback' );
 		}
+		self::$instance_count += 1;
+		$this->instance_number = self::$instance_count;
 
 		$this->sections = array(); // Users cannot customize the $sections array.
 
@@ -185,6 +207,7 @@ class WP_Customize_Panel {
 		$array = wp_array_slice_assoc( (array) $this, array( 'title', 'description', 'priority', 'type' ) );
 		$array['content'] = $this->get_content();
 		$array['active'] = $this->active();
+		$array['instanceNumber'] = $this->instance_number;
 		return $array;
 	}
 
diff --git a/wp-includes/class-wp-customize-section.php b/wp-includes/class-wp-customize-section.php
index 3553285cc4..86c565d56c 100644
--- a/wp-includes/class-wp-customize-section.php
+++ b/wp-includes/class-wp-customize-section.php
@@ -10,6 +10,26 @@
  */
 class WP_Customize_Section {
 
+	/**
+	 * Incremented with each new class instantiation, then stored in $instance_number.
+	 *
+	 * Used when sorting two instances whose priorities are equal.
+	 *
+	 * @since 4.1.0
+	 * @access protected
+	 * @var int
+	 */
+	protected static $instance_count = 0;
+
+	/**
+	 * Order in which this instance was created in relation to other instances.
+	 *
+	 * @since 4.1.0
+	 * @access public
+	 * @var int
+	 */
+	public $instance_number;
+
 	/**
 	 * WP_Customize_Manager instance.
 	 *
@@ -137,6 +157,8 @@ class WP_Customize_Section {
 		if ( empty( $this->active_callback ) ) {
 			$this->active_callback = array( $this, 'active_callback' );
 		}
+		self::$instance_count += 1;
+		$this->instance_number = self::$instance_count;
 
 		$this->controls = array(); // Users cannot customize the $controls array.
 
@@ -194,6 +216,7 @@ class WP_Customize_Section {
 		$array = wp_array_slice_assoc( (array) $this, array( 'title', 'description', 'priority', 'panel', 'type' ) );
 		$array['content'] = $this->get_content();
 		$array['active'] = $this->active();
+		$array['instanceNumber'] = $this->instance_number;
 		return $array;
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d850eece6d..f96d6edbb8 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.1-alpha-30213';
+$wp_version = '4.1-alpha-30214';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.