Package: firefox Version: 49.0-5 Followup-For: Bug #842952 > 1) Parts of the UI have gained ugly heavy black borders. This seems to > be fixed upstream for a future release: > https://bug98304.bugzilla.mozilla.org/show_bug.cgi?id=1266914
I was able to work around this issue by adding the following to
~/.config/gtk-3.0/gtk.css (taken from the bug you mentioned):
```
frame { border-color: #a2a2a1; }
separator { color: #a2a2a1; }
```
Best regards,
George
