[Timshel]

I mean in term of user facing change. Vertical tabs is still presented as an innovation ...

Tabs groups are barely explored, and let's not dream too much of isolation Firefox containers are probably over ten years old and still almost unused :(.

More recently Arc and Zen are trying to innovate (I’m not using either), but they probably have almost no chance as long Chrome stay as dominant and financed by ad tracking.

Using Firefox on linux I’m facing more and more capchas and broken or innacessible websites. Ladybird is making great progress but unless they start posing as chrome they’ll face the same challenges :(.

Edit: > churning out more or less useful Web API implementations

Probably part of the problem since it makes maintaining a browser engine absurdly expensive and out of reach for almost everyone ...