And who knows, maybe Mozilla is right—but I wonder if they've actually done large-scale feedback gathering. This isn't the sort of thing you can suss out just from looking at analytics.
> Firefox simply wanted it to be more obvious that the address bar is in focus the moment you open a new tab.
Is that it? Because I'm still trying to figure this out! I'm just really surprised that this was a problem for a substantial number of users—the address bar already had a very prominent focus state with its thick blue outline.
I'd even argue that indifference should be the goal when making design changes; make subtle changes over time instead of the complete overhauls that are common today.
Either I never noticed or that very prominent focus state was invisible in the theme I installed. So yes, it was definitely one of the most regular issues I had with Firefox and now it's fixed. Not in the most elegant way but it works for me.
Indifference among people already using Firefox is a good outcome if it is viewed favorably by people new to Firefox, which is who I would guess these kinds of changes are aimed at.
Let me know if I've got the issue wrong.