About this extension

Simple Tab Groups works across browser instances/windows too. If you select a group in another window, the selected window will jump to the foreground with the chosen group selected. You can even select the specific tab within that group in background browser windows. GIF example

Functionality / development notes:

New design implementation
Dark theme added
Added colored group icon
Added the ability to import the backup groups of the old extension Tab Groups
Added support of the Mozilla extension Firefox Multi-Account Containers
Now fully supports multiple windows
Saves last active tab after change group
Show currently used group in icon (see screenshot)
NOT supported: Private (Incognito) Mode
Added ‘close tab’ by middle-mouse click
Added simple switching between groups and tabs in search mode using the up, down, right, and left keys
"Manage groups" functionality
Added Drag&Drop support for tabs and groups in popup window
Added support sorting groups (context menu in popup window)
Added field for search/filter tabs in "Manage Groups"
Added support to Backup/Restore tabs, groups and settings to/from json file
Custom group icons, set group icon from tab icon (by context menu)
Added Undo Remove group by context menu browser button (see screenshot)
Added support for catch tabs by containers (#76)
Added dark theme
Added support SideBar

REQUIRED for dark theme: Set svg.context-properties.content.enabled to true in about:config page. How to do this.

Permissions used:

tabs: for tab management
tabHide: for hide tabs
contextualIdentities & cookies: to integrate with Firefox Multi-Account Containers
notifications: for notification on move tab to group etc.
menus: for creating tabs context menus
sessions: for save session data (last used group, etc.)
downloads: for creating auto backups
storage: for saving groups locally
unlimitedStorage: restore tabs after close window, there can be a lot of tabs
<all_urls>(Access your data for all websites): for tab thumbnails and catch/move/reopen tabs in needed containers/groups
webRequest & webRequestBlocking: for catch/move/reopen tabs in needed containers/groups
(optional) bookmarks: access for create bookmarks

How to integrate with the Gesturefy extension
You have to input the following into Gesturefy:
Add-on ID: simple-tab-groups@drive4ik
Parse message: On
Supported actions:

{"action":"add-new-group"}
{"action":"load-next-group"}
{"action":"load-prev-group"}
{"action":"load-next-unloaded-group"}
{"action":"load-prev-unloaded-group"}
{"action":"load-history-next-group"}
{"action":"load-history-prev-group"}
{"action":"load-first-group"}
{"action":"load-last-group"}
{"action":"load-custom-group"}
{"action":"delete-current-group"}
{"action":"open-manage-groups"}
{"action":"move-active-tab-to-custom-group"}
{"action":"discard-group"}
{"action":"discard-other-groups"}
{"action":"reload-all-tabs-in-current-group"}

This extension may conflict with other programs similar in functionality.
Conflicted extensions include, but may not be limited to:

Tab Open/Close Control
Panorama View

Please — help me translate this extension into your language!

This extension also has these plugins:

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Release notes for 4.5.1

v4.5.1

added Manage groups & Settings buttons to sidebar, #575
now you can exclude some containers in group options
added option to change temporary container title, #476
allow mute/unmute tab/group (only popup and sidebar)
added browser action new context item "Reopen tabs with temporary containers in new"
hide archived group from list move tab to
tab positions don't match real tab positions, #580
hide group option "Don't discard tabs into this group after hide" if has enabled global option "Discard tabs after hide (this will save the RAM)"
fix create temporary container
fix hide tabs when open browser with new tabs by desktop shortcut
fix bug on duplicate tabs after window close, but I find another bug: in some cases, FF does not save the container of the newly opened tab (new) after restarting the browser. I need to make a bug in bugzilla
update fr translation, thanks for klint
update cs_CZ translation, thanks for Diomed
update it translation
bugfixes, some improvements

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