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Tab Session Manager vs Tab Manager Plus: catalog facts
Tab Session Manager	Tab Manager Plus
Free Free and open source under the MPL.	Free Free, with source code published on GitHub.
Browser extension	Browser extension
Automatic periodic saves mean a crash or misclick costs nothing Optional Google Drive sync moves sessions between machines	Overview of all tabs across windows Search to find a tab quickly
Cloud sync depends on a Google account Very large session histories slow the interface	Small project maintained mainly by one developer
Browser extension	Browser extension
Open source	Closed source
License: MPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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