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Simple Tab Groups vs Tree Style Tab: catalog facts
Simple Tab Groups	Tree Style Tab
Free Free open-source extension.	Free Free and open source under the MPL.
Browser extension	Browser extension
Keeps many tabs organised into switchable groups Actively maintained with frequent updates	Branches can be collapsed or closed as a unit, which tames deep research sessions Very configurable appearance and behaviour
Firefox only Extra complexity compared with Firefox's built-in tab handling	Firefox only Hiding the native tab strip requires editing userChrome.css
Browser extension	Browser extension
Open source	Open source
License not stated	License: MPL-2.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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