What I really wish, is that Tab Grouping takes into account of Links opened from the Group. Example, if it collect all Hackernews into a group, I also want to option for all Tabs opened from Hackernews, in this case a Tab opened on the article "Firefox is Brining in Tab Grouping Feature" would also moved to the new group, preferably sitting next this Hackernews Tab or stayed in the order the tabs aligned in the new Tab Group.

Most of the Tab Group, AFAIK dont offer this feature. And I have to manually do it. Which isn't possible if you have lots of tabs.

>there was a feature on Firefox called “Panorama” which was ahead of its time if you ask me.

I remember Panorama being very very slow. It looks nice but not practical enough. I remember at the time requesting for List of Tabs with close button and search, precisely what is on offer now on Firefox but was rejected.