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Tab Manager Plus vs Tree Style Tab: catalog facts
Tab Manager Plus	Tree Style Tab
Free Free, with source code published on GitHub.	Free Free and open source under the MPL.
Browser extension	Browser extension
Overview of all tabs across windows Search to find a tab quickly	Branches can be collapsed or closed as a unit, which tames deep research sessions Very configurable appearance and behaviour
Small project maintained mainly by one developer	Firefox only Hiding the native tab strip requires editing userChrome.css
Browser extension	Browser extension
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.