Good idea but a major showstopper flaw. WHen you click the ontab icon it sends ALL tabs to onetab. Rarely does one want that. The default should be to send the current tab to oneTab. I have made this mistake several time. Even on the dropdown menu "send this tab" should be the first option. ALso no way to create a new grouping in the onetab page so that you can move closed tabs to a new group.

10/10/25 Mozilla can't handle the heat from all the incompetent add on "developers" so they are now trying to censor users by requiring and email address to login. One tab is a classic example of a Mozilla "recommended" add-on that is just no damn good.

Can't deal with long tab lists and
reduces your system to a crawl by eating up memory to produce the list. One example of many mozilla add-ons that need to be sold to someone who actually knows what they are doing. Slow to load very slow to import export which has to be done manually. Another junk Mozilla "Recommended" add-on
Now let's see if Mozilla deletes this review or my account.
Mozilla going the way of GMAIL. God help us.

Worked for bringing over a thousand tabs over from Chrome because google insists on trying to kill adblock.
My only real complaint is the layout is infinitely better on Chrome than Firefox, the Firefox layout is just a basic list broken down by window while Chromes is an actual usable program you can organize things in, it's basically the same layout as the bookmark manager in Firefox. The Firefox version is also missing over half the options page from the Chrome version.
In my opinion, it's useful as a way to move tabs over from Chrome when swapping browsers but not as an actual tool for use with Firefox, unless you're swapping to Firefox permanently don't bother with it and just get the Chrome version. Particularly since it hasn't been updated in over two years at this point and the Chrome version was just updated less than a month ago.

great addon love it the best

The extension consumes all RAM and makes PC unusable. With 100 tabs on the list (closed) and 2 open tabs it eats all 8GB and all disk swap. Giving the fact the goal of extension is to save RAM, this makes no-sense.

Have been a onetab user for years at this point, and will be for years to come! :D

Great addion :)

Great features, easy to use, simple and effective

ممتاااز جدا

It is restoring tabs, one by one, so when I had 5600 tabs, it was trying to restore (open) a 5600 tabs one by one.
Browser of course crashed, so I was not able to open my tabs.
It is not possible to make "auto groups" based on domain or regular expression.

Some people here are idiotic (the ones who store 10 years long tabs history and never backup it). This extension is holy grail. IT WORKS GOOD. AND HAS NO ADS. FOR YEARS. Princesses who can't backup your sh#t once in a month are meant to suffer in this society. Thx mr developer. The only suggestion is to add star icon for bookmark saving in the tabs list

I exported my tabs from the Brave extension to come to Firefox (well, Zen), and it didn't export the names of my groups. This isn't a big deal for me, except sometimes I've put videos in their with the tab name as the timestamp, so of course that's gone. It's not like,,, horribly confusing or whatever, just extremely limited I guess. And I also lose the add date of the info.

DANGER. The app slows down the system a lot. And if you use groups for tabs, it deletes them!

ОПАСНО. Приложение сильно тормозит систему. А если вы используете группы для вкладок, то она их удаляет!