Update 2022: The new default behavior is to show a menu popup when you click the addon button instead of the "manage groups" overview, and I cannot find a way to switch it back, making this addon much less useful to my workflow.

To the developer: It would be amazing if you could add a toggle in the settings that would make the addon button in the toolbar immediatly open the "manage groups" window instead of opening the popup.


2018: It works wonders, and is a great replacement for the pre-Quantum tab group add-on.

Looks great and works well. Thank you!

Changing groups just closes all your active tabs and opens the others. So when you switch back, all your tabs reload and you lose history (as in the back or forward button). Pretty pointless. It's about as useful as having a text file with links of your tabs, because you lose your history. This add on should take advantage of the new tabhide in the about:config and maybe that will help it work properly.
Also, even though I restore info from the old tab groups, it didnt bring the history so again i cannot hit back button. shame.

It does what I was looking for!

Дерьмо редкостное. Во всяком случае, с версией 60.0.2. Половина вкладок не загружается, добавляется в группы неизвестно что.

The interface, like many WebUI extensions, is pretty horrible. Notifications are extremely slow and take a long time to disappear. It’s almost impossible to move tabs from one group to another with accidentally loading the group. Similarly the group list has two sides: the left side will load the group; the right side will load a tab list of the group. This is not very clear as this behaviour isn’t normal for a drop-down menu.

Loading a group with a large number of tabs (despite the option to only load active tabs) will try to load ALL TABS, potentially freezing your computer. Firefox itself does not do this when loading tabs, so it’s a mystery why this extension does.

Finally the Manage Groups page shows nothing, so no managing is possible.

Addon crashes with Message: TypeError: t is null

Don't forget to implement a simple nullcheck. If(obj != null) very simple

Dear Drive4ik - when you gonna fix the bug - ??? it keeps on giving same "Tab error" still :(

Great add-on. However, there are some issues with it, that makes it very annoying for me. Not sure if it's related to other add-ons (such as Session Manager), but here they are:
- "Move tab to" menu is in a sub-menu (takes too much time and precise mouse accuracy)
- Does not accept local (non-internet) tabs. As a web designer, this really sucks.
- After switching group, all tabs are loaded. I don't want that.
- Tabs disappear sometimes (not a lot and not sure when)
- It forgets a lot in which tab group you were last time and you end up with a copy of all your tabs in a non-group tab. (Probably after restarting Firefox, not sure)
To the developer: I appreciate your efforts! I really do. The rating just reflects my "annoyment" and is no reflection to you or your efforts.

Terrible. Lost all my important tabs. Burn in hell

Messed up all my tabs only get cryptic symbols for my 140 tabs
example of tab url:

moz-extension://47d18f13-11b1-42af-a084-593b87913208/replaced/replaced.html?state=redirect&title=Newegg.com%20-%20Newegg%20shopping%20upgraded%20%E2%84%A2&url=https%3A//secure.newegg.com/NewMyAccount/AccountLogin.aspx%3Ftojump%3D0%26nextpage%3Dhttps%253a%252f%252fsecure.newegg.com%252fNewMyAccount%252fOrderHistory.aspx%253fRandomID%253d44983722522043620180414112356&favIconUrl=https%3A//c1.neweggimages.com/WebResource/Themes/2005/Nest/Newegg.ico

Tiene todo lo mejor de su predecesor además de funcionalidades nuevas y es muy rapido.

I love this extension; Groups are one of the most important features and you've implemented them beautifully. However, I have a question (and forgive me if this is the wrong place to ask, but I couldn't find anyplace else).

Are all my groups in memory all the time? Or only the active group? That's important for resource management.

Thanks!

This is the best that ever came after Firefox killed the integrated TabGroup feature. Just wondering if there could be the option to set a shortcut key for backuping your tab goups to a json file?

I appreciate this add-on but I won't use it anylonger because the current version gives it permission to "Access your data for all websites".

Just amazing. Simply amazing. It moves my "Personal" tabs automatically to group.
There are few small things that can help like sync and hiding (instead reloading when switch)(And this is coming in next FF version so it will be implemented in new version of addon)

Thank you for reviving this add-on!! Works GREAT, almost better than the old original. Just one request: I'm losing my tab groups after I shut down FF. I thought that did not happen before, but not sure. Would it be possible to add an autosave / auto backup / auto start option?

But above all: thank you guys for the excellent work in making Firefox great again.

Lost all my tabs with this add on, I hate the new Firefox and this add-on don't help me to stay .

I can live with the clunky UI, but not with data loss. After a short time it began to pop up nonsensical error messages ("Not one tab was not synchronized" or something). At some point it never finished loading, and all my saved tabs were lost. Avoid.

It's the closest thing to the original Tab Groups that I've yet seen.
Pluses: CLEAN and neat interface. Great Layout idea. Easy to shuffle things around by Drag and Drop.

Very awesome! Brings back one of my favorite features that was removed from Firefox.

All good but would like the ability to leave tabs loaded when switching groups. Would save a lot of logging in and out. As someone else said, if the memory gets out of hand, closing and re-opening is easy. Yes, that also means losing logins, but it's the difference b/t logging in and out of sites several times a day (current) and re-logging-in to sites after a week or more when it's time to restart. A lot of people wouldn't need it, but the option would be great.

Very promising Tab Groups successor.
Edit:
After 3 years this had become one of the most irreplaceable must-have extensions for me, and I have to commend the developer for still maintaining it. I'm still baffled why such useful functionality (Panorama) was removed from FF in the first place.

This is a great addon, but I'm sticking with an older version because the current version gives it permission to "Access your data for all websites".

I realize that this permission is being used to create site thumbnails, but would it be possible to create a version that doesn't include thumbnails so that such a broad level of access isn't required?