Terrible UI, terrible UX, just a terrible extension all in all. Firefox devs should implement its own native tab grouping solution so users don't have to resort to using garbage.

This extension sends you annoying Windows notifications every time you move a tab to another group. And no, you can't turn this off. It also automatically downloads files and saves them in your Downloads directory without your permission.

There's nothing "simple" about this extension. It's complex and mostly confusing. Here are a few suggestions:
- Have default groups coincide with native multi-account containers.
- Clean the dropdown menu to choose group. It's so busy it's not usable.
- Create sane defaults and avoid three pages of settings at all costs.

In other words: design the UX yourself, don't defer this design to users putting every imaginable option under the sun everywhere.

Extension closed all tabs except few I put in a group, so I must find other tabs in history. I couldn't find a way to restore closed tabs. Thanks, but no thanks...

Horrible. I created a new group and it closed all my existing tabs. Originally, I thought I did something wrong, but many other reviewers had the same experienc. An add-on shouldn't be doing surprises like that.

I tried numerous suggestions but could not even get this to work so uninstalling

I thought I could use it to organize hundreds of opened tabs. Not only did it it fail to do that, it also irrevertebly closed all tabs when I was trying something out. That sucks hard!

As far as I can see, this is just a glorified bookmarks tool (which we already have). Why bother to install an add on for something we already have? I hope someone designs a tab groups tool like the one in Chrome.

Upon clicking a tab group it opened a new window and closed the old, deleting all open tabs without a warning or a chance to restore them.

Then suddenly the created group was empty too.

Really unprofessional and annoying. Just stick to established UI-norms, what's so hard?
Drive4ik can't be voted down enough.

Became spyware. Asked to track extension usage after the recent update.

Works only for less number of tabs. If the numbers increases, it fails and all you work gets damaged. Using for around 1 year now, it crashed multiple times, but I continued using it, since I did not find anything as useful as it was. But now, I don't think it deserves my time. Productive people should avoid using it as one cannot have any idea when it is going to crash, mix few tabs from two different groups, delete few tabs, delete few groups, ruin all your work, add same tabs in a single group for multiple times and the list goes on.

Nothing simple about this extension, it sounds like feature other browsers has, but really it takes just as long to navigate through shitty design that this extension has as if to sort through that 100 tabs you expected to organize.

non-working for my FF, lost of time

If you are an avid collector of tabs DO NOT INSTALL THIS EXTENSION!

As soon as I created my first tab group it instantly an irreversibly deleted all my 100+ tabs -- no option to recover them. This extension was a serious disruption to my workflow and it will take a long time to recover from this incident.

Was hoping for something similar to Chrome's tab groups. App was clunky, difficult to navigate, and slow to use.

It had an error and I lost all the groups I had created. Waste of time, not reliable at all.

Terrible add-on. Used it for just 2 days. On 3rd day, all my saved tabs were gone. Missing. Poof. No explanation. Not simple at all. More like complicated. Avoid at all cost.

After year of ordinary usage just wiped all my tabs and backups too!

Worst. Extension. Ever. Arbitrarily deletes tabs with no warning and no option for recovery.

100% CPU usage

It's good extension but when it has big bug: sometimes tabs in one of the group are duplicated during browser restart.
Update: very stupid and annoying bug, I did reopened the browser 6-7 times and now I have 100 tabs in my Work group. It's so buggy. Can't use it anymore.