I suppose there are browsers like Brave that would be in the position to implement Chrome features, which I guess happens by default. But let's just say in the situation where Chrome implements something that doesn't show up downstream in Chromium; Brave's interests might not be in competing directly with Chrome but focusing efforts on BAT/crypto and replacing ads.
Firefox has the Simple Tab Groups extension, which works with containers. Chrome not only doesn't have containers, but its tab grouping is clunky and featureless in comparison.
???
Vivaldi is the king of features. Too bad it is so slow.
Firefox has extensions for all you need. Vertical tabs, tab groups etc
There were thousands before and what, a handful now? Firefox jumped the shark years ago, and I loved it from day 1.
I use FF/brave but no browsers make me happy any longer.
I'd pay good money to have FF back before the bean counters killed it.
Now I just see FF as something google pays to make sure barely works so they can point and say there are other browsers.