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Sidebery
What it is
Sidebery is a Firefox extension for managing tabs and bookmarks from a sidebar. Customizable panels can display tabs, bookmarks, and browsing history. Tabs can appear in a flat list or tree, use custom group names and colors, and be sorted; tabs in folded branches or inactive panels can unload automatically. Container features can bind containers to tabs panels, reopen tabs in a target container by URL, and set proxy and User-Agent configurations for container tabs. Users can adjust context menus, mouse and keyboard controls, drag-and-drop behavior, and sidebar and group-page styles with variables or custom CSS. Snapshots can save information about open windows and tabs. Sidebery stores data locally by default, with optional sync through Firefox Sync or Google Drive; users choose which settings and selected tab data to synchronize. The extension is free and licensed under MIT. Its maker warns that add-ons that reposition, move, or sort tabs may conflict with it. Firefox also does not allow extensions to hide the native horizontal tab bar; the project points to userChrome.css workarounds.
For and against
For
- Panels can show tabs, bookmarks, and browsing history.
- Tabs can use tree layouts and custom groups.
- Container tabs support proxy and User-Agent settings.
- Optional sync uses Firefox Sync or Google Drive.
- Data is stored locally by default.
Against
- Available as a Firefox extension only.
- Other tab-moving or sorting add-ons may conflict.
- Firefox extensions cannot hide the native tab bar.
The verdict
Sidebery offers extensive sidebar organization and customization, including optional synchronization and container controls. Users should account for potential conflicts with other tab-management add-ons and Firefox's native tab bar limitation.
Who it suits
Sidebery suits Firefox users who want to organize tabs, bookmarks, and browsing history in customizable sidebar panels. It may be less suitable alongside add-ons that reposition or sort tabs.
Plans and prices
Sidebery
Firefox extension · donations accepted
Read 4 Oct 2026 · github.com
On the record
- Compatibility limit
- The project warns Sidebery may conflict with add-ons that position, move, or sort tabs, potentially causing unexpected behavior or broken tab state at initialization.github.com · read 4 Oct 2026
- Containers
- Container features include binding a container to a tabs panel, reopening tabs in a target container by URL, and setting proxy and User-Agent configuration for container tabs.addons.mozilla.org · read 4 Oct 2026
- Customization
- Users can customize the context menu, mouse and keyboard controls, drag-and-drop behavior, and sidebar and group-page styles with variables and custom CSS.addons.mozilla.org · read 4 Oct 2026
- License
- The repository identifies the project license as MIT.github.com · read 4 Oct 2026
- Native tabs limit
- The add-on page says Firefox does not allow extensions to hide the native horizontal tab bar and points users to userChrome.css workarounds.addons.mozilla.org · read 4 Oct 2026
- Panels
- It provides customizable panels for tabs, bookmarks, and browsing history.addons.mozilla.org · read 4 Oct 2026
- Permissions
- Required permissions are access to recently closed tabs and browser tabs; additional permissions are optional and support features such as bookmarks, history, proxy settings, and snapshot export.addons.mozilla.org · read 4 Oct 2026
- Privacy
- The privacy policy says Sidebery does not engage in ad targeting or data collection, stores data locally by default, and sends data only when sync is enabled and only to the selected provider.github.com · read 4 Oct 2026
- Purpose
- Sidebery is a Firefox extension for managing tabs and bookmarks in a sidebar.github.com · read 4 Oct 2026
- Security reporting
- The security policy supports the latest version published on addons.mozilla.org and directs vulnerability reports to [email protected].github.com · read 4 Oct 2026
- Snapshots
- Snapshots can be configured to save information about open windows and tabs.addons.mozilla.org · read 4 Oct 2026
- Support
- The maker invites users to create a GitHub Discussion or email the developer with questions about the privacy policy; the add-on lists [email protected] as its support email.github.com · read 4 Oct 2026
- Sync data
- Users can choose which settings, context-menu configuration, keybindings, custom styles, and selected tab data are synchronized.github.com · read 4 Oct 2026
- Synchronization
- Optional sync providers named in the privacy policy are Firefox Sync and Google Drive.github.com · read 4 Oct 2026
- Tab layouts
- Tabs can be shown as a flat list or a tree, grouped with custom names, colored, sorted, and automatically unloaded in folded branches or inactive panels.addons.mozilla.org · read 4 Oct 2026
