Tab Groups isn't in v56 either. What you're looking for is actually there, at least most of it:

> More Extension APIs: Firefox extensions will become more capable with additional features for tab management and organization, including a full implementation of Tab Hiding (61)

Once you can hide tabs, you can basically have tab groups.

You're probably better off with v52ESR, it's at least getting maintained with security patches for another few months. FF61 should enable the Tab Groups addon to return in June (release of the tab hiding API), v52 is maintained until August.

I use to try everything available to group tabs regardless of browser. They all had their issues.

Eventually I just went with keeping things in their own browser window. With multiple monitors or a screen big enough to have separate windows the dragging and dropping of tabs works fine.

Then the issue becomes that you cant save tab groups :(

You can even use multiple browsers if they do something useful for a type of group. History and bookmarking becomes even more mysterious that way.

The extensions I used to save groups are all broken atm.

This dropped recently. Needs a config to be set in about:config, but besides that, works just as well

https://addons.mozilla.org/en-US/firefox/addon/panorama-view...