Best extension hands down. Recent update did remove on of the (imo) best features, ability to drag stashed tabs to a different folder.

An irreplaceable extension. The only two things I wish Tab Stash had are 1) the ability to pin groups to the top of the Tab Stash page and 2) the ability to collapse/expand all the folders in a group with one button. Those are tiny nitpicks, though.

This is the cleanest looking tab stash addon I know. It stays out of the way. You can get all tabs open with one click. One issue though, the new update added a lot of boxes to the tab UI "to make it match Firefox's style"?, and it looks too busy now. The older UI looked better. 5*

Extremely good and powerful. I am using it as complimentary add-on for in-built bookmarks system and it has already considered many possible use cases like de-duplication, close stashed/saved tabs, highlight opened tabs, and it even updates order of bookmarks if the actual tabs are re-arranged before saving! I also recommend setting this extension page as homepage so all links are neatly organized and accessible. This wouldn't be possible without this add-on, anyone used to papaly will know exactly how useful this is. Also you can import links and file structure from copied list of bookmarks.

works as a Side Bar in LM22.2

If the "Save all tabs" option is selected, empty open tabs (without an active domain) are not saved, only tabs with an active domain are saved.
Slow to save 1960 open tabs, no language available support (Italian)

Great app and EXACTLY what I needed as other tab management apps couldn't deliver in terms of management, separation and stability. That being said, I would really love it if there was another way to rescan for titles and headers AFTER importing tabs from URLs. Some of them seem to have failed as I was moving them and the only option to retry the scan is just to retrieve the icons (which it already has so the button does nothing.) Unfortunately, I don't have a github account to reach out with this complaint.

The name of this extensions is not wrong, It stash's tabs. Out of all the extensions I tried (and I tried alot) this does it the best. Yes the setup is a wee bit confusing but once that was sorted I managed to get it working exactly how I wanted it too. This should be a base firefox feature, Idk why it is not already (needs to be part of firefox view).

The only one thing I would like to see (other then it being part of firefox view) is the ability to select multiple tabs in a stash and export them to a file (for sharing else where)

Edit: the dev responded and I am embarrased I missed the setting to import and export, It literally is the exact addon I was looking for. Now my firefox actualy loads fast.

It is processing tabs, one by one. So when stashing tabs it takes ages.
Firefox allocated 8GB of RAM and crashed (I have few thousands tabs opened).

It is storing "stashes" in a bookmarks which is good.

When tabs are finally stashed, then it is using about 500MB of RAM just to show a list of "stashes".

I'm in love with this extension! Would love to see it on Chrome based browsers too (please port it, I desperately need it lol)

best tabs add-on I have used so far.

非常好用

Be ye forewarned... do not jump right into this or any other open tab manager if you have a lot of currently opened tabs that you expect the extension to help you sort out.
My fault really, but intending to just look around, I hovered & then clicked to stash on a filtered selection. Not seeing a way to pause, cancel or undo; I could only let it run. How bad could it be?
It not only "stashed" the ~500 tabs from the filtered selection, but threw the other 3200 tabs in with. Then to my horror found that it put every single one of the 3700 tabs into "hidden tabs".
I only learned of this after a frantic race to shut down every other process & service on the machine to free up as much of the 32GB as possible, praying that Fx wouldn't crash.
It finally ended, and after wasting a bunch of time trying to find a solution, have now resolved to spending more time cleaning up the resulting mess than it would have taken without the help of the extension.
Badly needs an Undo. Badly needs Select/Unselect All on filtered lists. There's not even the ability to Tap-Space to keep selecting in a list, it's a slog of one-click-at-a-time. Badly needs a setting to only affect what is selected and don't mess with anything else.