(In reply to Marco Bonardo [:mak] from comment #5)
(In reply to Dão Gottwald [::dao] from comment #2)
Turns out we tried 390 (non-Mac) / 425 (Mac) before and there was backlash.
Could you please point out which kind of negative feedback that brought, and how much time ago? I'm not sure which important use-cases it would break, and we should still report reasons when we pick a direction.
Bug 897160 comment 21 and below, six years ago. I think it was mainly people quickly testing responsive design without wanting to go through devtools responsive design mode. I expect people still to that today.
I think we should stick to UX requirements and evaluate fresh feedback on it, we have time for that.
What are the requirements? What specific bugs do we want to solve here? 400 seems to address this particular bug which I though was a requirement. With the two-line layout we also show more characters in the results than without the megabar, which I thought was our other goal.
While your screenshot is usable, one can easily have 3 or 4 action buttons active in the urlbar and those do not collapse (maybe they should!)
Yeah, collapsing seems like a smarter way to address that. Otherwise, even just with the zoom button and reader mode, it's just too easy to get into a situation where even 500 won't help.