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Sidebery vs Tab Manager Plus: catalog facts
Sidebery	Tab Manager Plus
Best for: Vertical tab tree and bookmarks sidebar with container support	Best for: People who keep dozens of tabs open across several windows
Free Free and open source under the MIT licence.	Free Free, with source code published on GitHub.
Browser extension	Browser extension
Panels can be bound to containers, keeping work and personal tabs apart Built-in snapshots restore a previous tab layout	Overview of all tabs across windows Search to find a tab quickly All 3 strengths for Tab Manager Plus Overview of all tabs across windows Search to find a tab quickly Available for both Chrome and Firefox
Firefox only The number of settings makes first setup slow	Small project maintained mainly by one developer
Browser extension	Browser extension
Open source	Not open source
License: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Sidebery addons.mozilla.org/firefox/addon/sidebery github.com/mbnuqw/sidebery Catalog checked September 22, 2026	Official website Full listing and sources Sources for Tab Manager Plus github.com/stefanXO/Tab-Manager-Plus Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.