Options in setting dialogs unreadable when mouse cursor hovers over them
When I open "Preferences" dialog and try to edit any options which are represented with checkboxes or radio buttons when I point mouse at them the text becomes the same color as the background so you can't read it. First I thought it had something to do with my gtk theme settings but other gtk programs show their dialogs fine, so it must be a firefox issue.
Are you using the Default Theme?
It appeared to be a faulty gtk theme engine after all :-( It mixed up background and text color in prelight mode. So it's not a firefox bug. Sorry to have bothered you, folks.