Ulf's post highlights the two preferences being vocalized; having FF's default active tab highlight, or not. When a theme is using the FF default doesn't blend very well, as in Ulf's case. This leads to my suggestion to use the 'Highlight the active tab' CT option to allows users to select their preference. Or have a new option, etc... 🙂 Well, and some don't like the square tabs (or tab coloring, as the mouse hover shows that the tab itself is still rounded, its the color application that isn't).