Hi Alan, I think what you are seeing is the standard Windows XP title bar color expanded to twice the height. That white-on-blue theme may be disturbingly vibrant. (I always preferred the Silver theme on Windows XP, but that's neither here nor there.)

Many aspects of Firefox's interface can be changed using custom style rules, or themes, or extensions. I'm not sure which are best for Windows XP, so hopefully others will jump in. I could look at XP on an old computer this evening if it isn't solved by then.

Alan

what I did in windows XP, since I had the same problem you have. start > settings > control panel > display > appearance > color scheme as the first person suggested I chose silver.

I hope this helps  ! (my first ever contribution !!) Roberto

That was an easy fix because you explained it without a lot of clutter. Thank you Roberto

Alan