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Tree Style Tab vs Simple Tab Groups: catalog facts
Tree Style Tab	Simple Tab Groups
Best for: Shows Firefox tabs as a vertical tree with parent and child relationships	Best for: Firefox users juggling many tabs across separate projects
Free Free and open source under the MPL.	Free Free open-source extension.
Browser extension	Browser extension
Branches can be collapsed or closed as a unit, which tames deep research sessions Very configurable appearance and behaviour	Keeps many tabs organised into switchable groups Actively maintained with frequent updates All 3 strengths for Simple Tab Groups Keeps many tabs organised into switchable groups Actively maintained with frequent updates Translated interface
Firefox only Hiding the native tab strip requires editing userChrome.css	Firefox only Extra complexity compared with Firefox's built-in tab handling
Browser extension	Browser extension
Open source	Open source
License: MPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Tree Style Tab addons.mozilla.org/firefox/addon/tree-style-tab github.com/piroor/treestyletab Catalog checked September 22, 2026	Official website Full listing and sources Sources for Simple Tab Groups github.com/drive4ik/simple-tab-groups Catalog checked October 2, 2026

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