How does this work for you? The only thing I miss about Chrome is it's default exposure of the bookmarks bar on new tab page.
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...
I think I'm using a tweaked version of this one:
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.
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.