OneTab vs Sidebery

OneTab turns open browser tabs into a saved list that users can restore one at a time or all at once. It works with Chrome, Firefox, Edge, Safari, and other browsers, and is listed for macOS and Windows. The maker says reducing open tabs can save up to 95% of memory. Saved tabs can be organized into folders, reordered, merged, or managed with quick lists, search, tasks, and stars. Users can import and export tab lists or share a list as a web page. OneTab is free, with no signup required for tab saving and organization. Its optional Backup & Sync encrypts data on the device before upload and uses end-to-end AES-256 encryption, according to the maker. Sync covers saved tabs and settings, not browsing history or currently open tabs. OneTab remains accessible offline, and changes made offline sync when the user is online again. A single Backup & Sync license covers multiple computers, browsers, and profiles, up to 100.

Sidebery is a free Firefox extension for managing tabs and bookmarks in a sidebar. Its panels can display tabs, bookmarks, and browsing history, with tabs shown as a flat list or tree. Users can group tabs under custom names, color and sort them, and automatically unload folded branches or inactive panels. Container features bind containers to panels, reopen URLs in selected containers, and set proxy or User-Agent settings. The extension also supports tab search, session restore, suspension, workspaces, snapshots, and optional cross-device synchronization. Context menus, mouse and keyboard controls, drag-and-drop behavior, and sidebar styles can be customized with variables and CSS. Data is stored locally by default; Firefox Sync or Google Drive can sync selected settings and tab data. The project is MIT-licensed. Firefox does not permit hiding the native horizontal tab bar, and some tab-moving add-ons may conflict.