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Tab Stash vs Tab Session Manager: catalog facts
Tab Stash	Tab Session Manager
Free Free and open source under the GPL.	Free Free and open source under the MPL.
Browser extension	Browser extension
Stashed tabs are plain bookmarks, so they sync and survive uninstalling One click clears a window without losing anything	Automatic periodic saves mean a crash or misclick costs nothing Optional Google Drive sync moves sessions between machines
Firefox only	Cloud sync depends on a Google account Very large session histories slow the interface
Browser extension	Browser extension
Open source	Open source
License: GPL-3.0	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 Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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