Hello, could you sign your add-on, because this add-ons is no more available since Forefox has desactivated every add-ons non signed. Thank you.
https://developer.mozilla.org/en/docs/Mozilla/Add-ons/Distribution

A well-designed and multi-featured add-on.

Update: Sorry, I missed that option. Well, that settles the only complaint I had about the add-on. Thank you.

Very good plugin, but today it appeared "unknownError unrelated to the database" error, and all hidden tabs pop up to my browser, and the plugin keeping no work.

It keeps duplicating tabs in groups. randomly, in random groups. Aftrer closing and re-opening firefox suddenly I have 10, 15 tabs more then before. Some of them are just copy of another

I found this plugin really awesome and can't live without it. But apparently, with the latest version 3.4.4 (firefox quantum 66.0.5), it no longer works. I can not change the tab group anymore and all tabs of other groups are accessible only via the hidden tab :-(. Many thanks for the support

Довго шукав заміну для застарілого додатка, це найкращий додаток на даний момент, що дозволяє групувати вкладки

Awesome Add-On, I cannot live without it. However, it seems that with latest Firefox update it got disabled (Add-On needs to be signed) any ETA for it ?

Very good extension, thanks a lot !

Takes a significant amount of time to restore a lot of tabs (Win 64, FF dev), but otherwise a handy extension.

Thanks. Does what I needed, however, I can't figure out why when I delete a tab from the tab bar, it deletes it from the Tab Group. This defeats the purpose of the addon. Am I doing something wrong...? Am I missing something...? Please advise. Thx again.

I am using Firefox 66.0.3, addon version 3.4.3, Windows 7 64bit.
I forgot to mention that it happens not every time.
You can contact me at alexjzx (@) gmail.com.
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Add-on is really cool and it does the job well, but:
1) It takes too much time to load tabs, about 2-3 mins for ~60 tabs
2) Until it is loaded, you re not gonna to do anything to your tabs, because it will load tabs state in 3 mins and will erase all your progress(e.g. newly opened tabs)
3) Thus, it slows down starting your work with the browser.
For the rest, this addon is great and highly usable.

Updating from old Firefox, great replacement for the old tab groups addon,

Quick question - in the old add on when restoring tabs it would restore the tab including its history (the previous & newer webpages loaded by each tab), is that still the case ?

Also, encountered an issue/bug where the addon reorganises the order the tabs are shown from the last time you shut down pc to when booting it the next day - sometimes moving them to a different group (so far this only happens on tabs on the same webpage - the homepage - google )

Absolutely fantastic add-on! Great for organizing many open tabs and windows. Note one thing that was not very clear early on for me is that each group is associated with only one window. So you cannot have multiple windows associated with a single group. Although I did not expect this at first, this approach gives a very fluid user experience. I cannot recommend this extension enough if you are like me and tend to keep many tabs and windows open for an absurd amount of time and return to them later.

One slight annoyance is how, from what I can tell, there is no easy way to convert a window that is not associated with a group to be a new group. If you select ALL open tabs in a window, use "Move tab to group" to a new group, it closes the window you were just on, changes the current window to another one, and changes that window to the newly created group. Expected behavior is to keep the window open when creating a new group for all tabs on the the current window.

Found a very unpleasant bug. When you switch to a group of tabs, they all start to load. No settings to change the behavior found.
UPD:
In the new version, the error is not fixed.