Don’t see what you mean, maybe changing your appearance or theme in control panel. I also have Firefox and mine is just fine, did you change your theme in Firefox?
That's definitely not the default theme/persona. It may be a problem with the theme or persona that you are using. BTW, I don't see it in your screen shot either.
OK, now I see what you mean. I have that as well on both Firefox and Thunderbird. I do have Aero on, so it actually helps to see the text. This is probably by design. I don't know of a way of removing it, but there might be a userChrome edit that you could use. Post over in Firefox Support at Index page • mozillaZine Forums and one of the experts in modding Firefox can probably help you remove it.
Or you could try asking for something to put in the userChrome file at the forum I mentioned. The guys who play with this really enjoy figuring out how to do these mods.
Huh!!! What happened to the firefox icon and title?
Anyway, that's the titlebar that's white and that has to be changed in the Windows display properties.
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