I've lost all my tabs! fack you!
A temporary solution for windows: go to C:\Users\XXXX(Username)\AppData\Roaming\Mozilla\Firefox\Profiles\2vl8majd.default\extensions and open extension@one-tab.com.xpi with firefox. Then reload the tab.

tmd,This rubbish, I have lost all my labels

1.36 on FF 80.0.01 lost all tab after restar,tested in two pc ，don't upgrade.This is the second time I have lost all tab, I will not use this plugin again

After the latest update you have to remove the extension and add it again to make one tab work again in firefox. But you will lose all your stored tabs in the past.

I created the account specifically to write this review. I downloaded OneTab to get rid of old and redundant tabs that I had left open. After it succesfully merged them all in one tab, I proceeded to delete the unused ones. After restoring the session my firefox froze and when I opened it up again literally all my tabs were gone.
For many years a lot of people were telling me that I would be better off using using bookmarks more and I think OneTab is all I needed to make me switch.

>>> UPDATE REQUIRED TO FIX FIREFOX ISSUE ON ANDROID!!! <<< ### DO NOT INSTALL!!! UPDATED JULY 2019!!! ###

Do not use on Android! Removed all my tabs.

Every time I open Firefox on Android it duplicates the Onetab tab. Half my tabs are Onetabs. I love it on the PC, but it's God awful on mobile.

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~When I am researching something, I tend to open a lot of tabs. It gets chaotic and then, at the end of the day, I just don't want to see them any more. One Tab takes care of it, like a good housekeeper. Wonderful!~
Well that was from while ago. After a recent update, we went from 5 to 0 stars but 1 will have to do. No One Tab, it completely disappeared and with it, my tabs (obviously).

FINGER WEG!!!
Ein Klick auf Speichern hat bei mir sämtliche Tabs geschlossen, ohne eine Liste zu erzeugen. Alle Tabs waren somit weg. Die App sollte eher TrashTab heißen.

Not compatible with Panorama Tab Groups, Panorama View

Like many others I tried it but it's disappointing.
My 100+ tabs are lost.
It seems that on Android there are two types of tabs, recently open (the one open on the current session maybe?) and older one (from previous sessions). The older one are not recognize by onetab, thus not recorded.

This extension just took 100 open tabs and saved only one! 😠 Those were important. I like OneTab for PC, but this mobile extension makes you guys pure trash.

First time I tried to use it, it closed all my tabs (nearly a hundred that I'd kept open across crashes, reboots and FF updates for months) and gave me a list of only the most recent two. I think this is probably the first time in my life I really feel like I could murder someone. I'm sure it will pass but it won't stop me hoping the developer gets hit by a bus.

Does not respect hidden tabs, therefore cannot be used with Simple Tab Groups or other tab managers. Completely useless in it's current form.

I've used this extension religiously for years on my desktop and I love it. However, I just installed it on my Android phone and upon using it, it deleted ALL of my tabs and didn't even save them!! I had over 100 tabs open and now they are gone! I am EXTREMELY disappointed.

Used OneTab for desktop Firefox forever, I installed it to use on my Android phone and it deleted ALL of my tabs which are now unrecoverable!!! DO NOT USE OR YOU WILL LOSE YOUR DATA!

Like many others said, saved like two tabs and deleted dozens of others. DON'T DO IT. Send your mobile tabs to Firefox desktop and use onetab there.

Deleted hundreds of tabs on mobile despite showing as working in the mobile store. Only saved on unimportant tab. Don't trust it!!

Пользовался расширением много лет, никаких сбоев не было. И тут внезапно перестал открываться. Потерял пару сотен ссылок.