Sidebery is a Firefox extension for managing tabs and bookmarks in a sidebar panel.
The extension addresses the problem of tab and bookmark organization in Firefox by providing a highly configurable sidebar that displays tabs in either tree or flat layout, alongside dedicated panels for bookmarks, history, and search functionality. Users can customize the context menu and visual styles to suit their workflow, and the tool includes a snapshots feature for saving window, panel, and tab states.
Sidebery suits developers and power users who work with many tabs and want fine-grained control over their organization without relying on Firefox's native tab bar. The extension is particularly valuable for those who prefer vertical tab layouts and need to manage complex tab hierarchies. The README notes that Sidebery may conflict with other addons that handle tab positioning or movement, such as Tree Style Tabs, so users should disable such extensions to avoid unexpected behavior or broken tab state. The tool provides multiple installation options, including stable releases through Mozilla's addon store and nightly builds for testing new features.
Development activity shows consistent maintenance with regular updates addressing user needs. The project maintains both stable and nightly release channels, with nightly builds signed and configured for automatic updates to facilitate testing. The maintainer actively manages compatibility issues, documenting known conflicts with other addons and providing detailed guidance for users attempting to hide native tabs through various Firefox configuration methods.
