Hmm, well, looks like me normal testing profile is screwed up. On a new profile, default, light and dark themes are there. They also seem to work with the patch for main window, address book window and message stand-alone window. The only thing that doesn't quite work it the compose window. So security error anywhere to be seen. On the compose window the menu and toolbar are also dark, the addressing widget isn't dark. So it must have loaded some CSS, no?
Bug 1543815 Comment 13 Edit History
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Hmm, well, looks like me normal testing profile is screwed up. On a new profile, default, light and dark themes are there. They also seem to work with the patch for main window, address book window and message stand-alone window. The only thing that doesn't quite work it the compose window. (Edit) NO security error anywhere to be seen. On the compose window the menu and toolbar are also dark, the addressing widget isn't dark. So it must have loaded some CSS, no?