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Tree Style Tab vs Sidebery: catalog facts
Tree Style Tab	Sidebery
Best for: Shows Firefox tabs as a vertical tree with parent and child relationships	Best for: Vertical tab tree and bookmarks sidebar with container support
Free Free and open source under the MPL.	Free Free and open source under the MIT licence.
Browser extension	Browser extension
Branches can be collapsed or closed as a unit, which tames deep research sessions Very configurable appearance and behaviour	Panels can be bound to containers, keeping work and personal tabs apart Built-in snapshots restore a previous tab layout
Firefox only Hiding the native tab strip requires editing userChrome.css	Firefox only The number of settings makes first setup slow
Browser extension	Browser extension
Open source	Open source
License: MPL-2.0	License: MIT
Not stated if an account is 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 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 Sidebery addons.mozilla.org/firefox/addon/sidebery github.com/mbnuqw/sidebery Catalog checked September 22, 2026

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