This extension makes tab management super easy. I have had all my tab links disappear before, but they have always shown up again with a refresh or a browser restart. To be safe though, I do export my tabs occasionally.
I especially like:
- ability to name tab groups
- ability to lock tab groups
- ability to quickly reopen a tab group
- when my tabs get out of control, I send them all to OneTab where they are much easier to pick and choose the keepers and then sort them
The only thing that is mildly annoying for me is that I will occasionally hit the OneTab icon in my toolbar by mistake and send all my tabs to OneTab. This is a very minor inconvenience though because I can restore all the tabs almost as quickly.

it's great and I've been using it for years, but it is missing a merge function whereby i can merge a list with another one

DO NOT INSTALL THIS. It will delete all of your tabs, with no way to recover them. Check the other reviews, this is happening to everyone.

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it's a very good add-on, one tab is essential for me

it's good, but you won't love it any more once you lose the tabs stashed

Mobile version review: I was pleased to find that there was a mobile version of OneTab, and it has many of the same functions, but a major downside in my usecase is that I can't practically add more than 10-15 tabs into OneTab at a time. I have to swipe through my tabs to load them, which will present them as able for OneTab to see and save. If I'm... not careful, or not quick enough, or TOO quick(?????), a tab will unload and I will have to go back and reopen it to make it able to be OneTab'ed.

This mobile version would be massively improved by the ability to just save all tabs all at once. I feel like the fact it's not here may mean there's something about Firefox mobile that keeps it from having that function, but if that's not the case, please add "send all tabs to OneTab".

Very Helpful. Series of Tabs/Screens that need to be opened daily - makes this quick & easy. I also lost all tabs - a years worth! Reached out to OneTab Support. With their suggestions & some creativity - I did not give up - took a bit of work but was able to restore ALL. I have since learned to use Export to back up my list - not ideal but better than gone. I now DISABLE OneTab BEFORE ALL FIREFOX UPDATES - so far this has resolved the loss issue [also not ideal but for me worth it] Looking thru some other reviews most of the issues I see are easily resolved. [For the record - I am not great with Tech by any definition - but can follow instruction if motivated]

Don't use it, it's very great at first and then it will lose all your tabs. Twice.