diff --git a/apps/common/main/lib/util/utils.js b/apps/common/main/lib/util/utils.js
index 26b80a9df..77cd28771 100644
--- a/apps/common/main/lib/util/utils.js
+++ b/apps/common/main/lib/util/utils.js
@@ -602,6 +602,48 @@ Common.Utils.applyCustomization = function(config, elmap) {
     }
 };
 
+Common.Utils.applyCustomizationPlugins = function(plugins) {
+    if (!plugins || plugins.length<1) return;
+
+    var _createXMLHTTPObject = function() {
+        var xmlhttp;
+        try {
+            xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
+        }
+        catch (e) {
+            try {
+                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
+            }
+            catch (E) {
+                xmlhttp = false;
+            }
+        }
+        if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
+            xmlhttp = new XMLHttpRequest();
+        }
+        return xmlhttp;
+    };
+
+    var _getPluginCode = function(url) {
+        if (!url) return '';
+        try {
+            var xhrObj = _createXMLHTTPObject();
+            if (xhrObj && url) {
+                xhrObj.open('GET', url, false);
+                xhrObj.send('');
+                if (xhrObj.status == 200)
+                    eval(xhrObj.responseText);
+            }
+        }
+        catch (e) {}
+        return null;
+    };
+
+    plugins.forEach(function(url){
+        if (url) _getPluginCode(url);
+    });
+};
+
 Common.Utils.fillUserInfo = function(info, lang, defname) {
     var _user = info || {};
     !_user.id && (_user.id = ('uid-' + Date.now()));
diff --git a/apps/documenteditor/main/app/controller/Main.js b/apps/documenteditor/main/app/controller/Main.js
index 31283a5bb..ba9097302 100644
--- a/apps/documenteditor/main/app/controller/Main.js
+++ b/apps/documenteditor/main/app/controller/Main.js
@@ -147,6 +147,7 @@ define([
                     this.editorConfig = {};
                     this.appOptions = {};
                     this.plugins = undefined;
+                    this.UICustomizePlugins = [];
                     Common.Gateway.on('init',           _.bind(this.loadConfig, this));
                     Common.Gateway.on('showmessage',    _.bind(this.onExternalMessage, this));
                     Common.Gateway.on('opendocument',   _.bind(this.loadDocument, this));
@@ -857,7 +858,7 @@ define([
                 application.getController('Common.Controllers.ExternalMergeEditor').setApi(this.api).loadConfig({config:this.editorConfig, customization: this.editorConfig.customization});
 
                 pluginsController.setApi(me.api);
-                me.updatePlugins(me.plugins);
+                me.updatePlugins(me.plugins, false);
                 me.api.asc_registerCallback('asc_onPluginsInit', _.bind(me.updatePluginsList, me));
 
                 documentHolderController.setApi(me.api);
@@ -900,9 +901,14 @@ define([
                                 toolbarController.onApiCoAuthoringDisconnect();
                             me.api.UpdateInterfaceState();
                             me.fillTextArt(me.api.asc_getTextArtPreviews());
+
+                            if (me.appOptions.canBrandingExt)
+                                Common.NotificationCenter.trigger('document:ready', 'main');
                         }
                     }, 50);
-                }
+                } else if (me.appOptions.canBrandingExt)
+                    Common.NotificationCenter.trigger('document:ready', 'main');
+
 
                 if (this.appOptions.canAnalytics && false)
                     Common.component.Analytics.initialize('UA-12442749-13', 'Document Editor');
@@ -1008,7 +1014,9 @@ define([
                 params.asc_getTrial() && headerView.setDeveloperMode(true);
                 this.appOptions.canRename && headerView.setCanRename(true);
 
-                this.appOptions.canBrandingExt = params.asc_getCanBranding() && (typeof this.editorConfig.customization == 'object');
+                this.appOptions.canBrandingExt = params.asc_getCanBranding() && (typeof this.editorConfig.customization == 'object' || this.editorConfig.plugins);
+                if (this.appOptions.canBrandingExt)
+                    this.updatePlugins(this.plugins, true);
 
                 this.applyModeCommonElements();
                 this.applyModeEditorElements();
@@ -1443,13 +1451,15 @@ define([
             },
 
             hidePreloader: function() {
-                if (!!this.appOptions.customization && !this.appOptions.customization.done) {
-                    this.appOptions.customization.done = true;
-                    if (!this.appOptions.isDesktopApp)
+                if (!this._state.customizationDone) {
+                    this._state.customizationDone = true;
+                    if (this.appOptions.customization && !this.appOptions.isDesktopApp)
                         this.appOptions.customization.about = true;
                     Common.Utils.applyCustomization(this.appOptions.customization, mapCustomizationElements);
-                    if (this.appOptions.canBrandingExt)
+                    if (this.appOptions.canBrandingExt) {
                         Common.Utils.applyCustomization(this.appOptions.customization, mapCustomizationExtElements);
+                        Common.Utils.applyCustomizationPlugins(this.UICustomizePlugins);
+                    }
                 }
 
                 Common.NotificationCenter.trigger('layout:changed', 'main');
@@ -1782,8 +1792,11 @@ define([
                 if (url) this.iframePrint.src = url;
             },
 
-            updatePlugins: function(plugins) { // plugins from config
-                if (!plugins || !plugins.pluginsData || plugins.pluginsData.length<1) return;
+            updatePlugins: function(plugins, uiCustomize) { // plugins from config
+                if (!plugins) return;
+                
+                var pluginsData = (uiCustomize) ? plugins.UIpluginsData : plugins.pluginsData;
+                if (!pluginsData || pluginsData.length<1) return;
 
                 var _createXMLHTTPObject = function() {
                     var xmlhttp;
@@ -1821,7 +1834,7 @@ define([
 
                 var arr = [],
                     baseUrl = plugins.url;
-                plugins.pluginsData.forEach(function(item){
+                pluginsData.forEach(function(item){
                     var url = item;
                     if (!/(^https?:\/\/)/i.test(url) && !/(^www.)/i.test(item))
                         url = baseUrl + item;
@@ -1834,14 +1847,14 @@ define([
                         autoStartGuid: plugins.autoStartGuid,
                         url: plugins.url,
                         pluginsData: arr
-                    });
+                    }, !!uiCustomize);
             },
 
-            updatePluginsList: function(plugins) {
+            updatePluginsList: function(plugins, uiCustomize) {
                 var pluginStore = this.getApplication().getCollection('Common.Collections.Plugins'),
                     isEdit = this.appOptions.isEdit;
-                if (pluginStore && plugins) {
-                    var arr = [];
+                if (plugins) {
+                    var arr = [], arrUI = [];
                     plugins.pluginsData.forEach(function(item){
                         var variations = item.variations,
                             variationsArr = [];
@@ -1852,7 +1865,9 @@ define([
                                     isSupported = true; break;
                                 }
                             }
-                            if (isSupported && (isEdit || itemVar.isViewer))
+                            if (isSupported && (isEdit || itemVar.isViewer)) {
+                                var isRelativeUrl = !(/(^https?:\/\/)/i.test(itemVar.url) || /(^www.)/i.test(itemVar.url));
+                                item.isUICustomizer ? arrUI.push((isRelativeUrl) ? ((item.baseUrl ? item.baseUrl : plugins.url) + itemVar.url) : itemVar.url) :
                                 variationsArr.push(new Common.Models.PluginVariation({
                                     description: itemVar.description,
                                     index: variationsArr.length,
@@ -1869,10 +1884,11 @@ define([
                                     buttons: itemVar.buttons,
                                     size: itemVar.size,
                                     initOnSelectionChanged: itemVar.initOnSelectionChanged,
-                                    isRelativeUrl: !(/(^https?:\/\/)/i.test(itemVar.url) || /(^www.)/i.test(itemVar.url))
+                                    isRelativeUrl: isRelativeUrl
                                 }));
+                            }
                         });
-                        if (variationsArr.length>0)
+                        if (variationsArr.length>0 && !item.isUICustomizer)
                             arr.push(new Common.Models.Plugin({
                                 name : item.name,
                                 guid: item.guid,
@@ -1882,11 +1898,15 @@ define([
                             }));
                     });
 
-                    pluginStore.reset(arr);
+                    if (uiCustomize!==false)  // from ui customizer in editor config or desktop event
+                        this.UICustomizePlugins = arrUI;
 
-                    this.appOptions.pluginsPath = (plugins.url);
-                    this.appOptions.canPlugins = (arr.length>0);
-                } else {
+                    if (!uiCustomize) {
+                        if (pluginStore) pluginStore.reset(arr);
+                        this.appOptions.pluginsPath = (plugins.url);
+                        this.appOptions.canPlugins = (arr.length>0);
+                    }
+                } else if (!uiCustomize){
                     this.appOptions.pluginsPath = '';
                     this.appOptions.canPlugins = false;
                 }
@@ -1895,7 +1915,7 @@ define([
                     if (plugins.autoStartGuid)
                         this.api.asc_pluginRun(plugins.autoStartGuid, 0, '');
                 }
-                this.getApplication().getController('LeftMenu').enablePlugins();
+                if (!uiCustomize) this.getApplication().getController('LeftMenu').enablePlugins();
             },
 
             leavePageText: 'You have unsaved changes in this document. Click \'Stay on this Page\' then \'Save\' to save them. Click \'Leave this Page\' to discard all the unsaved changes.',
diff --git a/apps/presentationeditor/main/app/controller/Main.js b/apps/presentationeditor/main/app/controller/Main.js
index 24e97d8c8..e8d5efe80 100644
--- a/apps/presentationeditor/main/app/controller/Main.js
+++ b/apps/presentationeditor/main/app/controller/Main.js
@@ -142,6 +142,7 @@ define([
                     this.editorConfig = {};
                     this.appOptions = {};
                     this.plugins = undefined;
+                    this.UICustomizePlugins = [];
                     Common.Gateway.on('init',           _.bind(this.loadConfig, this));
                     Common.Gateway.on('showmessage',    _.bind(this.onExternalMessage, this));
                     Common.Gateway.on('opendocument',   _.bind(this.loadDocument, this));
@@ -636,7 +637,7 @@ define([
                 application.getController('Common.Controllers.ExternalDiagramEditor').setApi(this.api).loadConfig({config:this.editorConfig, customization: this.editorConfig.customization});
 
                 pluginsController.setApi(me.api);
-                me.updatePlugins(me.plugins);
+                me.updatePlugins(me.plugins, false);
                 me.api.asc_registerCallback('asc_onPluginsInit', _.bind(me.updatePluginsList, me));
 
                 documentHolderController.setApi(me.api);
@@ -681,9 +682,14 @@ define([
                             if (me.needToUpdateVersion)
                                 toolbarController.onApiCoAuthoringDisconnect();
                             me.api.UpdateInterfaceState();
+
+                            if (me.appOptions.canBrandingExt)
+                                Common.NotificationCenter.trigger('document:ready', 'main');
                         }
                     }, 50);
-                }
+                } else if (me.appOptions.canBrandingExt)
+                    Common.NotificationCenter.trigger('document:ready', 'main');
+
 
                 if (this.appOptions.canAnalytics && false)
                     Common.component.Analytics.initialize('UA-12442749-13', 'Presentation Editor');
@@ -773,7 +779,9 @@ define([
                 params.asc_getTrial() && headerView.setDeveloperMode(true);
                 this.appOptions.canRename && headerView.setCanRename(true);
 
-                this.appOptions.canBrandingExt = params.asc_getCanBranding() && (typeof this.editorConfig.customization == 'object');
+                this.appOptions.canBrandingExt = params.asc_getCanBranding() && (typeof this.editorConfig.customization == 'object' || this.editorConfig.plugins);
+                if (this.appOptions.canBrandingExt)
+                    this.updatePlugins(this.plugins, true);
 
                 this.applyModeCommonElements();
                 this.applyModeEditorElements();
@@ -1196,13 +1204,15 @@ define([
             },
 
             hidePreloader: function() {
-                if (!!this.appOptions.customization && !this.appOptions.customization.done) {
-                    this.appOptions.customization.done = true;
-                    if (!this.appOptions.isDesktopApp)
+                if (!this._state.customizationDone) {
+                    this._state.customizationDone = true;
+                    if (this.appOptions.customization && !this.appOptions.isDesktopApp)
                         this.appOptions.customization.about = true;
                     Common.Utils.applyCustomization(this.appOptions.customization, mapCustomizationElements);
-                    if (this.appOptions.canBrandingExt)
+                    if (this.appOptions.canBrandingExt) {
                         Common.Utils.applyCustomization(this.appOptions.customization, mapCustomizationExtElements);
+                        Common.Utils.applyCustomizationPlugins(this.UICustomizePlugins);
+                    }
                 }
 
                 Common.NotificationCenter.trigger('layout:changed', 'main');
@@ -1563,8 +1573,11 @@ define([
                 }
             },
 
-            updatePlugins: function(plugins) { // plugins from config
-                if (!plugins || !plugins.pluginsData || plugins.pluginsData.length<1) return;
+            updatePlugins: function(plugins, uiCustomize) { // plugins from config
+                if (!plugins) return;
+
+                var pluginsData = (uiCustomize) ? plugins.UIpluginsData : plugins.pluginsData;
+                if (!pluginsData || pluginsData.length<1) return;
 
                 var _createXMLHTTPObject = function() {
                     var xmlhttp;
@@ -1602,7 +1615,7 @@ define([
 
                 var arr = [],
                     baseUrl = plugins.url;
-                plugins.pluginsData.forEach(function(item){
+                pluginsData.forEach(function(item){
                     var url = item;
                     if (!/(^https?:\/\/)/i.test(url) && !/(^www.)/i.test(item))
                         url = baseUrl + item;
@@ -1615,14 +1628,14 @@ define([
                         autoStartGuid: plugins.autoStartGuid,
                         url: plugins.url,
                         pluginsData: arr
-                    });
+                    }, !!uiCustomize);
             },
 
-            updatePluginsList: function(plugins) {
+            updatePluginsList: function(plugins, uiCustomize) {
                 var pluginStore = this.getApplication().getCollection('Common.Collections.Plugins'),
                     isEdit = this.appOptions.isEdit;
-                if (pluginStore && plugins) {
-                    var arr = [];
+                if (plugins) {
+                    var arr = [], arrUI = [];
                     plugins.pluginsData.forEach(function(item){
                         var variations = item.variations,
                             variationsArr = [];
@@ -1633,7 +1646,9 @@ define([
                                     isSupported = true; break;
                                 }
                             }
-                            if (isSupported && (isEdit || itemVar.isViewer))
+                            if (isSupported && (isEdit || itemVar.isViewer)){
+                                var isRelativeUrl = !(/(^https?:\/\/)/i.test(itemVar.url) || /(^www.)/i.test(itemVar.url));
+                                item.isUICustomizer ? arrUI.push((isRelativeUrl) ? ((item.baseUrl ? item.baseUrl : plugins.url) + itemVar.url) : itemVar.url) :
                                 variationsArr.push(new Common.Models.PluginVariation({
                                     description: itemVar.description,
                                     index: variationsArr.length,
@@ -1650,10 +1665,11 @@ define([
                                     buttons: itemVar.buttons,
                                     size: itemVar.size,
                                     initOnSelectionChanged: itemVar.initOnSelectionChanged,
-                                    isRelativeUrl: !(/(^https?:\/\/)/i.test(itemVar.url) || /(^www.)/i.test(itemVar.url))
+                                    isRelativeUrl: isRelativeUrl
                                 }));
+                            }
                         });
-                        if (variationsArr.length>0)
+                        if (variationsArr.length>0 && !item.isUICustomizer)
                             arr.push(new Common.Models.Plugin({
                                 name : item.name,
                                 guid: item.guid,
@@ -1663,11 +1679,15 @@ define([
                             }));
                     });
 
-                    pluginStore.reset(arr);
+                    if (uiCustomize!==false)  // from ui customizer in editor config or desktop event
+                        this.UICustomizePlugins = arrUI;
 
-                    this.appOptions.pluginsPath = (plugins.url);
-                    this.appOptions.canPlugins = (arr.length>0);
-                } else {
+                    if (!uiCustomize) {
+                        if (pluginStore) pluginStore.reset(arr);
+                        this.appOptions.pluginsPath = (plugins.url);
+                        this.appOptions.canPlugins = (arr.length>0);
+                    }
+                } else if (!uiCustomize){
                     this.appOptions.pluginsPath = '';
                     this.appOptions.canPlugins = false;
                 }
@@ -1676,7 +1696,7 @@ define([
                     if (plugins.autoStartGuid)
                         this.api.asc_pluginRun(plugins.autoStartGuid, 0, '');
                 }
-                this.getApplication().getController('LeftMenu').enablePlugins();
+                if (!uiCustomize) this.getApplication().getController('LeftMenu').enablePlugins();
             },
 
             // Translation
diff --git a/apps/spreadsheeteditor/main/app/controller/Main.js b/apps/spreadsheeteditor/main/app/controller/Main.js
index 70208e2b6..c692cf809 100644
--- a/apps/spreadsheeteditor/main/app/controller/Main.js
+++ b/apps/spreadsheeteditor/main/app/controller/Main.js
@@ -147,6 +147,7 @@ define([
                 // Initialize api gateway
                 this.editorConfig = {};
                 this.plugins = undefined;
+                this.UICustomizePlugins = [];
                 Common.Gateway.on('init', _.bind(this.loadConfig, this));
                 Common.Gateway.on('showmessage', _.bind(this.onExternalMessage, this));
                 Common.Gateway.on('opendocument', _.bind(this.loadDocument, this));
@@ -614,7 +615,7 @@ define([
 
                  if (!me.appOptions.isEditMailMerge && !me.appOptions.isEditDiagram) {
                     pluginsController.setApi(me.api);
-                    me.updatePlugins(me.plugins);
+                    me.updatePlugins(me.plugins, false);
                     me.api.asc_registerCallback('asc_onPluginsInit', _.bind(me.updatePluginsList, me));
                 }
 
@@ -684,9 +685,13 @@ define([
                             }
                             if (me.needToUpdateVersion)
                                 toolbarController.onApiCoAuthoringDisconnect();
+
+                            if (me.appOptions.canBrandingExt)
+                                Common.NotificationCenter.trigger('document:ready', 'main');
                         }
                     }, 50);
-                }
+                } else if (me.appOptions.canBrandingExt)
+                    Common.NotificationCenter.trigger('document:ready', 'main');
 
                 if (me.appOptions.canAnalytics && false)
                     Common.component.Analytics.initialize('UA-12442749-13', 'Spreadsheet Editor');
@@ -782,7 +787,9 @@ define([
                     if (this.appOptions.canBranding)
                         this.headerView.setBranding(this.editorConfig.customization);
 
-                    this.appOptions.canBrandingExt = params.asc_getCanBranding() && (typeof this.editorConfig.customization == 'object');
+                    this.appOptions.canBrandingExt = params.asc_getCanBranding() && (typeof this.editorConfig.customization == 'object' || this.editorConfig.plugins);
+                    if (this.appOptions.canBrandingExt)
+                        this.updatePlugins(this.plugins, true);
 
                     params.asc_getTrial() && this.headerView.setDeveloperMode(true);
                     this.appOptions.canRename && this.headerView.setCanRename(true);
@@ -1325,13 +1332,15 @@ define([
             },
 
             hidePreloader: function() {
-                if (!!this.appOptions.customization && !this.appOptions.customization.done) {
-                    this.appOptions.customization.done = true;
-                    if (!this.appOptions.isDesktopApp)
+                if (!this._state.customizationDone) {
+                    this._state.customizationDone = true;
+                    if (this.appOptions.customization && !this.appOptions.isDesktopApp)
                         this.appOptions.customization.about = true;
                     Common.Utils.applyCustomization(this.appOptions.customization, mapCustomizationElements);
-                    if (this.appOptions.canBrandingExt)
+                    if (this.appOptions.canBrandingExt) {
                         Common.Utils.applyCustomization(this.appOptions.customization, mapCustomizationExtElements);
+                        Common.Utils.applyCustomizationPlugins(this.UICustomizePlugins);
+                    }
                 }
                 
                 this.stackLongActions.pop({id: InitApplication, type: Asc.c_oAscAsyncActionType.BlockInteraction});
@@ -1773,8 +1782,11 @@ define([
                 if (url) this.iframePrint.src = url;
             },
 
-            updatePlugins: function(plugins) { // plugins from config
-                if (!plugins || !plugins.pluginsData || plugins.pluginsData.length<1) return;
+            updatePlugins: function(plugins, uiCustomize) { // plugins from config
+                if (!plugins) return;
+
+                var pluginsData = (uiCustomize) ? plugins.UIpluginsData : plugins.pluginsData;
+                if (!pluginsData || pluginsData.length<1) return;
 
                 var _createXMLHTTPObject = function() {
                     var xmlhttp;
@@ -1812,7 +1824,7 @@ define([
 
                 var arr = [],
                     baseUrl = plugins.url;
-                plugins.pluginsData.forEach(function(item){
+                pluginsData.forEach(function(item){
                     var url = item;
                     if (!/(^https?:\/\/)/i.test(url) && !/(^www.)/i.test(item))
                         url = baseUrl + item;
@@ -1825,14 +1837,14 @@ define([
                         autoStartGuid: plugins.autoStartGuid,
                         url: plugins.url,
                         pluginsData: arr
-                    });
+                    }, !!uiCustomize);
             },
 
-            updatePluginsList: function(plugins) {
+            updatePluginsList: function(plugins, uiCustomize) {
                 var pluginStore = this.getApplication().getCollection('Common.Collections.Plugins'),
                     isEdit = this.appOptions.isEdit;
-                if (pluginStore && plugins) {
-                    var arr = [];
+                if (plugins) {
+                    var arr = [], arrUI = [];
                     plugins.pluginsData.forEach(function(item){
                         var variations = item.variations,
                             variationsArr = [];
@@ -1843,7 +1855,9 @@ define([
                                     isSupported = true; break;
                                 }
                             }
-                            if (isSupported && (isEdit || itemVar.isViewer))
+                            if (isSupported && (isEdit || itemVar.isViewer)) {
+                                var isRelativeUrl = !(/(^https?:\/\/)/i.test(itemVar.url) || /(^www.)/i.test(itemVar.url));
+                                item.isUICustomizer ? arrUI.push((isRelativeUrl) ? ((item.baseUrl ? item.baseUrl : plugins.url) + itemVar.url) : itemVar.url) :
                                 variationsArr.push(new Common.Models.PluginVariation({
                                     description: itemVar.description,
                                     index: variationsArr.length,
@@ -1860,10 +1874,11 @@ define([
                                     buttons: itemVar.buttons,
                                     size: itemVar.size,
                                     initOnSelectionChanged: itemVar.initOnSelectionChanged,
-                                    isRelativeUrl: !(/(^https?:\/\/)/i.test(itemVar.url) || /(^www.)/i.test(itemVar.url))
+                                    isRelativeUrl: isRelativeUrl
                                 }));
+                            }
                         });
-                        if (variationsArr.length>0)
+                        if (variationsArr.length>0 && !item.isUICustomizer)
                             arr.push(new Common.Models.Plugin({
                                 name : item.name,
                                 guid: item.guid,
@@ -1873,11 +1888,15 @@ define([
                             }));
                     });
 
-                    pluginStore.reset(arr);
+                    if (uiCustomize!==false)  // from ui customizer in editor config or desktop event
+                        this.UICustomizePlugins = arrUI;
 
-                    this.appOptions.pluginsPath = (plugins.url);
-                    this.appOptions.canPlugins = (arr.length>0);
-                } else {
+                    if (!uiCustomize) {
+                        if (pluginStore) pluginStore.reset(arr);
+                        this.appOptions.pluginsPath = (plugins.url);
+                        this.appOptions.canPlugins = (arr.length>0);
+                    }
+                } else if (!uiCustomize){
                     this.appOptions.pluginsPath = '';
                     this.appOptions.canPlugins = false;
                 }
@@ -1886,7 +1905,7 @@ define([
                     if (plugins.autoStartGuid)
                         this.api.asc_pluginRun(plugins.autoStartGuid, 0, '');
                 }
-                this.getApplication().getController('LeftMenu').enablePlugins();
+                if (!uiCustomize) this.getApplication().getController('LeftMenu').enablePlugins();
             },
             
             leavePageText: 'You have unsaved changes in this document. Click \'Stay on this Page\' then \'Save\' to save them. Click \'Leave this Page\' to discard all the unsaved changes.',