Gary R
The address bar is screwed on this version (it "overlaps" any add-on icons that might be to the right of it), so I do not recommend people update to it until Mozilla have fixed this minor annoyance (or you're prepared to move your add-on icons to the left of the address bar).
Moving add-on icons to the left of the address bar makes the toolbar even worse.
My advice give this one a veto until they've developed it properly.
Gary R
Problem was resolved as soon as I reverted back to 54.0.1 so I can't see how it could be anything else. Could be the new version doesn't get along with one of my add-ons.
What I don't like in the more modern versions of Firefox, is your inability now to resize your address bar, which was possible in earlier versions, and which would have probably resolved this issue for me without the need to revert.
PS. Have tried both 32 bit and 64 bit versions of 55.0.2 and in both, the address bar superimposes itself over the first add-on icon to the right of it, irrespective of which add-on it is, or whether I remove icons from the toolbar to give it more space or not.
PSS. My Linux machine just updated to Firefox 55.0.2 and the toolbar on that is f****d as well. Haven't yet worked out how to revert to an earlier version of Firefox on that platform yet, so it's quite an annoyance.
Gary R
Good idea, I'll post something there tomorrow if I get the chance. I can't imagine I'm the only once that this has happened to, but maybe no one else has noticed that they have a problem yet.
Gary R
After a bit of investigation by me, it turns out the problem was caused by the theme I use, which doesn't appear to be compatible with 55.0.2.
Strange that it wasn't flagged during the update, since FF is supposed to check add-ons and themes for compatibility, and disable them if they're not compatible.
Don't like the default theme for 55.0.2 but at the moment there do not appear to be too many alternatives, and in any case all FF add-ons are going to change come FF57. So anything that's compatible now, won't be compatible then, which means that at present there's little or no point in searching for a theme that I get along with.
So I'll stick with FF54.0.1 on my Windows machines, and "live" with FF55.0.2 (and its appalling appearance) on my Linux machine.