I just upgraded to Firefox 20.0. Now, the theme (default or others) do not seem to apply on the navigation bar and the menu bar. It's just black background. Theme applies correctly on the rest of the browser.
Are your themes compatible with Firefox 20.0 Beta?
Theme developers don't always update their products for beta versions of Firefox.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
In Firefox Safe mode these changes are effective:
Try a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
I lost my theme as well upon updating. I checked the current themes available in the Firefox add on network (Add-ons for Firefox -> Themes) and if you try and preview any available theme none work. Not even the freshest theme available as of today. Not sure what has changed with the code in this latest release.
Previewing a lightweight theme (persona) only works on sites that are white-listed via an allow exception, so make sure to have an allow exception for the www.getpersonas.com domain if you still use that site and not the add-ons site. You can see the permissions for the domain in the current tab in:
Make sure that you do not use Clear (Recent) History to clear the "Site Preferences".
Sorry, I'm not following the solution. The theme has been successfully installed and it reflects on the browser. The only problem is that the navigation bar and the menu bar don't reflect the theme.
Is this an acknowledged problem? I see atleast 7 people have isse. As of 3/4, my browser is up to date and the issue still persists.
Additonal details. I'm permanently on Private browsing mode. When I get off the private browsing mode, the problem is fixed.
But obviously, that's not the solution. Now, you guys can atleast re-create the problem.