Compare software

Sidebery vs Tree Style Tab: catalog facts
Sidebery	Tree Style Tab
Best for: Vertical tab tree and bookmarks sidebar with container support	Best for: Shows Firefox tabs as a vertical tree with parent and child relationships
Free Free and open source under the MIT licence.	Free Free and open source under the MPL.
Browser extension	Browser extension
Panels can be bound to containers, keeping work and personal tabs apart Built-in snapshots restore a previous tab layout	Branches can be collapsed or closed as a unit, which tames deep research sessions Very configurable appearance and behaviour
Firefox only The number of settings makes first setup slow	Firefox only Hiding the native tab strip requires editing userChrome.css
Browser extension	Browser extension
Open source	Open source
License: MIT	License: MPL-2.0
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 Sidebery addons.mozilla.org/firefox/addon/sidebery github.com/mbnuqw/sidebery Catalog checked September 22, 2026	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

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