Sidebery vs TabTabTab

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.

TabTabTab is a free Chrome extension for organising browser tabs across windows. It presents pinned, grouped, and standalone tabs in one list and lets you rearrange them by drag and drop. Tab groups and entire window sessions can be saved and restored, while automatic grouping works by domain or subdomain. The extension can alert you to duplicate tabs, merge windows, track tab access time, copy URLs, capture screenshots, search tabs, and clean up automatically. A side-panel overview and dark mode are included. The Chrome Web Store lists the extension with 3,000 users. The project’s public GitHub repository uses the MIT license, and the developer says the extension will not collect or use user data. Support information points to a desktop-browser support page and GitHub Discussions for questions, suggestions, and bug reports. The listed Free plan costs nothing, with no paid tiers or usage limits stated.