diff --git a/README.md b/README.md
index ebf60914..5425198a 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 ## About
 
-Sidebery combines vertical layout of tabs with Firefox's containers to provide the more convenient way of working with a big amount of open pages. It aims to be fast and beautiful and gives a lot of options for customizing. Some of the key features:
+Sidebery provides the list of tabs structured in a tree and bookmarks within the customizable panels. It aims to be fast, beautiful* and configurable. Some of the key features:
 
 ### Vertical tabs layout (flat or tree)
 
@@ -13,19 +13,19 @@ You can use a simple flat list of tabs or tree structure. Tree layout allows you
 
 ### Bookmarks panel
 
-Simple catalogs of your bookmarks. You can drag and drop links or tabs to create bookmarks and vice-versa. Basic operations: open in new window / create / edit / delete.
+Simple catalogs of your bookmarks. You can drag and drop links or tabs to create bookmarks and vice-versa. Basic operations: open in new window / sort / create / edit / delete.
 
 Other bookmarks features: 
 - Automatically delete an open bookmark from "Other Bookmarks" folder.
 - Highlight open bookmarks and activate its tab instead of opening new on clicking.
 
-### Advanced containers management
+### Tabs panels
 
-Isolate your internet activity with Firefox's containers. Sidebery separates containered tabs by panels and allows you to switch between them with the mouse or keyboard shortcuts.
+Configurable panels will help you sort your tabs.
 
-### Containers proxy, include and exclude rules
+### Containers management
 
-With this addon, you also can set proxy for different containers, use "include" and "exclude" rules to control what page should be open in which container.
+You can set "Include" and "Exclude" url-rules, proxy config and UserAgent header for each container.
 
 ### Customizable context menu
 
@@ -40,8 +40,18 @@ Also, you can use ctrl+click/shift+click method or use keyboard shortcuts.
 
 ### Customizable styles
 
-Sidebery provides full control of styles for sidebar and group page via variables and custom CSS.  
-`note: css selectors can be changed in the next version`
+Sidebery provides full control of styles for sidebar and group page via variables and custom CSS.
+
+> NOTE: To get currently available css-selectors use debugger:
+>   - Enter "about:debugging" in the URL bar
+>   - In the left-hand menu, click This Firefox (or This Nightly)
+>   - Click Inspect next to Sidebery extension
+>   - Select frame to inspect
+>     - Click on the rectangular icon (with three sections) in top-right area of the debugger page
+>     - Select "/sidebar/index.html" for sidebar frame
+>     - Select "/group/group.html" for group page frame
+>   - Browse "Inspector" tab
+
 
 ### Snapshots
 
diff --git a/addon/manifest.json b/addon/manifest.json
index c74c80b3..15431b27 100644
--- a/addon/manifest.json
+++ b/addon/manifest.json
@@ -8,7 +8,7 @@
   },
   "author": "mbnuqw",
   "name": "__MSG_ExtName__",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "default_locale": "en",
   "description": "__MSG_ExtDesc__",
   "homepage_url": "https://github.com/mbnuqw/sidebery",
diff --git a/package.json b/package.json
index 4396a3ee..ab3a56b6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sidebery",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "description": "Manage your tabs and bookmarks in sidebar",
   "main": "index.js",
   "scripts": {
diff --git a/src/sidebar/actions/tabs.js b/src/sidebar/actions/tabs.js
index 2a76d331..bbd60e6c 100644
--- a/src/sidebar/actions/tabs.js
+++ b/src/sidebar/actions/tabs.js
@@ -118,11 +118,13 @@ async function loadTabsFromGlobalStorage() {
   // Switch to panel with active tab
   let activePanelIsTabs = activePanel.type === 'tabs' || activePanel.type === 'default'
   let activePanelIsOk = activeTab.panelId === activePanel.id
+  if (activePanelIsOk) activePanel.lastActiveTab = activeTab.id
   if (!activeTab.pinned && activePanelIsTabs && !activePanelIsOk) {
     let panel = this.state.panelsMap[activeTab.panelId]
     if (panel) {
       this.state.panelIndex = panel.index
       this.state.lastPanelIndex = panel.index
+      panel.lastActiveTab = activeTab.id
     }
   }
 
@@ -229,11 +231,13 @@ async function loadTabsFromSessionStorage() {
   // Switch to panel with active tab
   let activePanelIsTabs = activePanel.type === 'tabs' || activePanel.type === 'default'
   let activePanelIsOk = activeTab.panelId === activePanel.id
+  if (activePanelIsOk) activePanel.lastActiveTab = activeTab.id
   if (!activeTab.pinned && activePanelIsTabs && !activePanelIsOk) {
     let panel = this.state.panelsMap[activeTab.panelId]
     if (panel) {
       this.state.panelIndex = panel.index
       this.state.lastPanelIndex = panel.index
+      panel.lastActiveTab = activeTab.id
     }
   }
 
diff --git a/src/styles/themes/default/styles-editor.styl b/src/styles/themes/default/styles-editor.styl
index 5dd65138..adccaecc 100644
--- a/src/styles/themes/default/styles-editor.styl
+++ b/src/styles/themes/default/styles-editor.styl
@@ -140,7 +140,9 @@
   transition: opacity var(--d-fast)
 
   &[data-hidden]
+    transition: opacity var(--d-fast), z-index var(--d-fast) var(--d-fast)
     opacity: 0
+    z-index: -1
   
 .StylesEditor .editor-box > .placeholder-note
   top: 50px