Earlier quoted context omitted.
I don’t know whether FF lacks these features, but I’m using: - webpage splits - search by image - go to non- url in bg tab - open in new tab in a virtual sub group rather than just to the right or at the end - tabs retain width on close until mouse goes away (helps with closing series of tabs) - bookmarks open in new tab by default - last tab doesn’t close the browser - gestures and toolbar customization That’s in Vi…
most people don't use those it would be silly to add them to firefox unless it was an extension.
Half of it is ergonomics so basic, that people wouldn’t even mention as a feature.
With this reasoning you could remove tab rearrangement, open in new window and similar “most don’t use” features.