Sidebery review
A deep, free tab manager for Firefox users who want tree-based control.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Sidebery is a free, open-source Firefox extension for organizing tabs, bookmarks, and browsing history in customizable sidebar panels. It suits Firefox users who want more structure than a standard tab strip, especially people managing many related tabs across named groups or panels. Its core model supports tree or flat vertical layouts, tab search, session snapshots, containers, and rules based on URLs. Data is stored locally by default, and the add-on is distributed under the MIT License.
The standout feature is its depth of tree-based tab management. Users can arrange tabs in folded branches, named tab groups, and separate panels, then automatically unload tabs in folded branches or inactive panels. Sidebery also adds snapshots of open windows, panels, and tabs, alongside dedicated bookmarks and browsing-history panels. Customizable styles, context menus, mouse controls, and keyboard controls make the interface adaptable, but this breadth is aimed at users willing to shape the sidebar around their workflow rather than those seeking a minimal tab list.
Sidebery’s ecosystem fit is centered on Firefox. The published feature set includes Firefox Sync and Google Drive for optional synchronization, while the local-storage default gives the extension a local-first setup. Container configuration and URL-based tab rules add useful control for users who separate browsing contexts. Firefox users seeking tree layouts, workspace-style panels, search, unloading, and session recovery should find a strong match in Sidebery. Users who need broad browser coverage or a simpler, less configurable tab manager should consider a more narrowly focused alternative.
Sidebery pros and cons
- Where it wins
- Tree and flat vertical layouts with named groups and panels
- Search, snapshots, unloading, bookmarks, history, and containers
- Free, open-source add-on with extensive customization
- Where it doesn't
- Browser coverage is focused on Firefox
- Sync is optional rather than the default storage approach
- Extensive controls may be more than simple tab lists require
Sidebery fact sheet, pricing and score →
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