I loved this extension, it did exactly what I needed it to, but the "open" button has suddenly stopped working. I tried removing and reinstalling the extension but I have no way of opening sessions anymore. I can only click on each link one by one. If this is fixed, I'll revise my review.

Documentation / Readme is insufficient. Cannot see what the Tab Session Manager is actually supposed to do and how to use it. What makes it worse, is the author's poor command of the English language. In Settings, file paths are not shown, and apparently cannot be set. All in all the whole thing seems too complicated to me. On top, when experimenting to make sense of the extension, it repeatedly crashes and takes the browser with it. A waste of time.

Does not even appear on the toolbar or anywhere else - so no idea if it actually works or not. About to uninstall and find something else.

I had been using it for a long time without issues, it saved me 2-3 times; but yesterday my computer crashed. My waterfox session file must have been corrupted and it restored it from the recovery one (previous.json) that is somehow 2 months old (thank you mozilla for not updating it more frequently). I immediately went to tab session manager to restore; but surprise surprise, all the backups are gone. At some point it seems the automatic backup feature stopped working and somehow even the older sessions disappeared. Idk if it was a browser update, error or that they were older than X and automatically deleted.
TLDR, even having this extension enabled to prevent the loss of my session, I still lost my session. I will either look for an alternative extension and/or start backuping the session file manually.

Would be nice to be able to save Tab Groups also.

all tabs re-opened, but tab groups are destroyed

Did not save my fucking tabs.

20250607 It does the job as it should! No complaint, till today that it double saves my open tabs. For example, if i have 2 windows and 50 tabs on each, it saves and opens 4x windows and 200 tabs. I use this extension for a long time now (years), without complaint. I don't know if it's firefox's fault or the extension (probably a firefox thing). Please take a look at this Sienori, thank you!

### 20250608 EDIT: I don't know what happened yesterday, but today it seems to be working fine as always, as it should, so i came back to edit the review, because, again, you've done an Awesome work sienori! You 've saved us many hours from being lost! Thanks, and please keep it up!! :-)

I tried Tab Manager Plus but found it USELESS. It doesnt save sessions like it says it does but this one I installed and BOOM, So easy to click on it and choose save session, thank you!

Destroying my tab groups every launch. All Tab Groups need to be recreated, all tabs need to be readded to their groups. Disabled until this is supported.

The only problem that I have with TSM is that it does not play nicely with Simple Tab Groups at the moment. I use STG all the time, so unfortunately until this bug is sorted, TSM is a non-starter for me. Which is unfortunate because it is highly recommended and I would like to use it. (P.S.: I run a Mac using Monterey so quite old, nevertheless, this post is accurate as at 2025-05-08.)

Works really well. I would like functionality to name windows and have that title persisting after saving and restoring a window or session. I'm using extension Window Titler that prefixes the name of the window with [MyTitle], followed by the name of whatever tab is currently open (so window title changes dynamically). That functionality is perfect, but that title is obviously lost when window is saved.

I have a problem: TSM doesn't save tab groups after I reopen Firefox. It opens all the previously opened tabs, but not in groups.

This is an excellent and convenient extension that I've used for years. It has saved me many times when I would have otherwise lost all my tabs. I love that I can create manual and automatic saved sessions and even back up to the cloud or export to a local file.

If possible, I would really love the ability to backup up tab groups. I know that it is a really new feature and I don't know if extensions have the ability to do that, but it would be very helpful.

I think that it would also be nice to have a feature to pin some sessions to the top of the list to make them easily accessible.