[capitol_]

This can be fixed with some user css.

/* Put the content below into your <firefox profile>/chrome/userChrome.css */ .browserContainer { background-color: #000000 !important; }

[dorgo]

Nice one! I had to create the folder "chrome" and the file userChrome.css and restart firefox. How to find the profile-folder: https://support.mozilla.org/en-US/kb/profiles-where-firefox-...