Whenever I typed something in the location bar, the drop-down box of suggestions appeared, but entirely covering the location bar instead of appearing just below as usual. This was particularly annoying because this happened at the same time I was editing the URL, which made this nearly impossible. This problem was always reproducible, until I restarted Firefox. I don't know how to reproduce it after the restart.
And also in safe mode?
I couldn't reproduce the bug yet. Until I find a way to reproduce, I won't be able to tell whether it can also happen in safe mode.
Perhaps another gtk issue? Was it really version 39 you were running?
(In reply to Wayne Mery (:wsmwk, use Needinfo for questions) from comment #3) > Was it really version 39 you were running? I think so.