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OneTab vs Tab Session Manager: catalog facts
OneTab	Tab Session Manager
Free Free to use. The software is closed source.	Free Free and open source under the MPL.
Browser extension	Browser extension
One click clears a runaway tab bar without losing anything Lists can be named, locked and shared	Automatic periodic saves mean a crash or misclick costs nothing Optional Google Drive sync moves sessions between machines
Closed source, and the shared-list feature uploads your URLs to their server Restoring a large list reopens everything at once	Cloud sync depends on a Google account Very large session histories slow the interface
Browser extension	Browser extension
Closed source	Open source
License not stated	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.