Sidebery vs Tabmanager.io

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.

Tabmanager.io is a browser extension for organizing open tabs and windows. Users can search and filter by title or URL, sort tabs, group them by domain, suspend them, find tabs playing sound and remove duplicates. Window controls let users rename windows, move tabs between windows by drag and drop, open tabs in new windows and merge windows. Saved windows can be restored, and smart restore opens tabs suspended. Session History offers a timeline for restoring individual windows or tabs and can save snapshots automatically in case the browser crashes. Users can also create URLs to share windows. The extension runs on Chromium-based browsers, including Google Chrome, Microsoft Edge, Vivaldi and Opera. Its Free plan costs nothing and includes window and session management, saved sessions and windows, session history and basic support. Advanced costs $35.88 a year and includes Backup & Sync and priority support. Session history is saved on the local machine, not in the cloud.