"Bookmark toolbar items are harder to touch in the new megabar redesign"
It's a bummer that Firefox is not respecting its own compact layout by needlessly enlarging the address bar while on focus, but the shadow dropped from the new monstrosity obscures the bookmarks toolbar in my desktop with default layout, too, and that's a real usability concern.
Until FF 72, adding the following to userchrome worked fine to mimic this behavior, but now it is broken:
https://github.com/Timvde/UserChrome-Tweaks/blob/master/tool...
https://github.com/MrOtherGuy/firefox-csshacks/blob/master/c...
I changed it into "transform 125ms linear 43ms" and removed the "transition-delay" lines because it felt too slow.
FF 74 didn't use to do this, neither does Chrome for me.
You've done everything except provide an actual argument in favor of why Mozilla should introduce this new UI behavior that breaks existing conventions and interferes with other features in ways that are as-yet unresolved.
And you're doing similar stuff elsewhere in the thread about other questionable Mozilla UI decisions.
Open new tab -> Click on one of the links in the Bookmarks Bar [1]
But now, when I open a new tab, the address bar is expanded and partially hides the Bookmarks Bar. So it's hard to click on my favourites. Needless to say, I disabled the new address bar straight away.
[1] I'm pretty sure that I do this more often compared to typing something in the address bar.