Tab Groups remains a good idea on paper but no one has done a useful implementation of it. I remember during the Firefox 4 Tab Group era I purposed that Tabs from site ( Say HN ) and any Tabs opened from that site, for example I have another tab from this submitted links bugzilla.mozilla.org. All To be moved together into a tab group instead of just moving site to a tab group.
It was rejected for whatever reason.
Now that Safari has them, I guess there’s pressure to have feature parity?
I'm also kinda disappointed they just copied the UI from Chrome instead of releasing a refreshed version of the previous implementation. Old Firefox tab groups were like Safari tab groups (or "workspaces" in Edge, Vivaldi, Zen and maybe others), and I think they are way better for organisation. Yeah, STG extension still exists, but having it built-in would be nice.
Assuming not, what’s the harm?
Tabs (including all kinds of groupings and UIs) were the best when they were dealt with in NPAPI plugins.
Mozilla foundation has been screwing them up ever since.
Of course, always for the betterment of humanity, totally not just because goggle told them to...
This feature is a must for me