Reviews of Tab Session Manager

By: sienori Add-on

List of user reviews and ratings for Tab Session Manager

Total ratings

4.16 (Rating count: 1,232)

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Review summary

Users praise the add-on for saving/restoring very large tab sessions and preventing loss after crashes, plus good customization and a manual export option. However, reliability issues recur: sessions can be deleted by bugs, auto-save can fail, and backups may be outdated. It also fails to preserve tab groups/Tree Style Tab state and per-tab history. Open/restore can be flaky, and delete actions lack confirmation, sometimes causing duplicates and memory bloat. Overall, strong concept, with fragile execution.

Pros

Saves and restores large tab sessions and thousands of tabs after crashes or closures.
Keeps sessions across multiple windows and helps prevent lost work.
Highly customizable and flexible workflow.
Supports manual export of saved sessions.
Has saved users from major losses by restoring many tabs quickly.

Cons

Bugs can delete all sessions and auto-save can fail, leading to data loss or stale backups.
Does not preserve tab groups or Tree Style Tab state, nor per-tab browsing history on restore.
Open/restore actions can misfire (Open button may not work, startup window shifts) and can create duplicate windows, increasing memory usage.
Delete button is too close to Open and often lacks a confirmation, risking accidental deletions.
Behavior varies across Firefox updates and some users report memory bloat from duplicated tabs.

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User Reviews

Recent rating average: 3.50

All time rating average: 4.16

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15% (89)

Date	Author	Comment
2026-08-13	Th*****

2026-07-21	OM*****	Very High CPU usage on many tabs. Other wise is amazing tools i am using all the time. because of this issue i have to disable it and enable all the time to avoid my CPU fan go crazy.
Very High CPU usage on many tabs. Other wise is amazing tools i am using all the time. because of this issue i have to disable it and enable all the time to avoid my CPU fan go crazy.
2026-07-19	Fi*****	Garbage extension. Can not find specific previous session. UI absolutely terrible. I can not emphasize how much I hate this PoS software. Uninstalling.
Garbage extension. Can not find specific previous session. UI absolutely terrible. I can not emphasize how much I hate this PoS software. Uninstalling.
2026-07-17	Be*****

2026-07-17	M・*****	神です。ありがとうございます。無いと困ります。
神です。ありがとうございます。無いと困ります。
2026-07-15	Fi*****	Cloud sync is broken, infinite loading (Same thing like GitHub issue 1451). Suggested fix to delete all data does not work. May work well for local-only use. But extension explicitly advertises cloud sync feature.
Cloud sync is broken, infinite loading (Same thing like GitHub issue 1451). Suggested fix to delete all data does not work. May work well for local-only use. But extension explicitly advertises cloud sync feature.
2026-07-13	Fi*****	Do not use this on browsers with multiple workspaces like Floorp - it moves all the tabs to one workspace, rendering the extension worse than useless.
Do not use this on browsers with multiple workspaces like Floorp - it moves all the tabs to one workspace, rendering the extension worse than useless.
2026-07-07	jo*****

2026-07-02	Al*****	The addon is not bad, at first glance. He copes with the assigned tasks, BUT very frequent begging for money (donations) is very annoying. I even started writing down the dates when the internal "thank the author" timer went off. 07 06 2026, 15 06 2026, 29 06 2026, 02 07 2026 And I was just opening a window to clear saved sessions.
The addon is not bad, at first glance. He copes with the assigned tasks, BUT very frequent begging for money (donations) is very annoying. I even started writing down the dates when the internal "thank the author" timer went off. 07 06 2026, 15 06 2026, 29 06 2026, 02 07 2026 And I was just opening a window to clear saved sessions.
2026-06-29	Fi*****