Sidebery vs Tablerone

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.

Tablerone is a Chrome extension for saving browsing sessions, restoring tabs, and organizing bookmarks. It lets users separate accounts, projects, holidays, or research into workspaces and switch between sessions. Saved bookmarks can carry tags and notes, with screenshot previews to help identify pages. The extension can recover closed or crashed tabs and automatically discard idle tabs to free memory and CPU. Users can share multiple links through a single importable link or export tab URLs, titles, notes, and other data. The maker says its Mobile Sync feature syncs bookmarks across devices. Browsing history and saved collections are stored locally, according to the maker; selected links are uploaded only when users publish collections. Tablerone documents Google Drive backup and imports from OneTab and Session Buddy. It is available free of charge as donationware, with a free plan.