Sidebery provides the list of tabs structured in a tree, bookmarks and history within the customizable panels. It aims to be fast and configurable. Notice: Sidebery may conflict with addons that handle position of new tabs (e.g. Tree Style Tabs) or addons that move/sort tabs, which may result in unexpected behavior or broken tabs state at initialization. To avoid potential issues, please, disable such addons in Add-ons Manager page (about:addons). Some of the key features:

- Tabs

- Simple flat list or tree with the option to set tree limit. - Group tabs (aka folders) with a custom name helps organize open pages. - Tabs colorization: Automatic per-domain/URL or manual. - Tabs sorting: by title, url or access time - Automatic unloading of tabs in a folded branch / inactive panel. - Customizable tab title. - ...

- Bookmarks

- Tree or chronological view. - Sort by name, URL or creation time - Basic operations: open in... / create / edit / delete. - Ability to highlight open bookmarks and activate the corresponding tab instead of opening a new one when clicked. - Automatically delete a bookmark on opening from "Other Bookmarks" folder or configured bookmarks panel. - ...

- Tabs / Bookmarks panels

- Organize your browsing with panels of tabs/bookmarks. - Convert open tabs in the panel to bookmarks and vice versa. - Automatically move tabs by URL to configured panel. - ...

- Containers

- Bind container to the tabs panel. - Automatically reopen tab in the target container by URL. - Setup proxy config and UserAgent header for tabs in a container. - ...

- Customizable context menu

Sidebery allows you to change the context menu for tabs and bookmarks. You can enable/disable/move options, create sub-menus/separators.

- Customizable mouse/keyboard controls

- Option to switch tabs with mouse-wheel. - Configurable drag and drop behavior. - A growing list of available actions for mouse/keyboard bindings.

- Customizable styles

Sidebery provides full control of styles for sidebar and group page via variables and custom CSS.

- Snapshots

You can setup auto snapshots that will keep info about open windows and tabs.

Privacy policy

https://github.com/mbnuqw/sidebery/blob/v5/PRIVACY.md

Source code

https://github.com/mbnuqw/sidebery

Permissions

- "Access recently closed tabs" - needed for the "Undo close tab" function. - "Access browser tabs" - needed to get info and control tabs. - "Store unlimited amount of client-side data" - needed to store favicons cache and snapshots. Optional permissions

Required for the next features: - Context menu option for cleaning cookies - Proxy and url rules of containers - Page-screenshots for the group page and windows selection panel - Changing the User-Agent per container

Required for the next features: - Hiding tabs on inactive panels - Hiding folded tabs

Notes

userChrome.css hacks

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More info you can find here

Developer response