Thank you, that definitely helped. Now if I could just find a way to change the text and background colors in tabs so the text is more readable. A lot of people seem to be asking this on the web, but the only things suggested as maybe fixes involve grubbing down into firefox innards, which is beyond me.
Doing the display preferences classic did change the File Edit line to white on dark blue which is an improvement and okay as I don't use it often (although I see the pulldown menus are dark grey on medium grey gahh), but for the tabs that's a fail since I use them a lot and also the color scheme hides some icons. For example, the New York Times one which I remember from XP as a black T is invisible on the dark blue. All the tabs on my XP firefox have white backgrounds, which seems fine for icons, and black text.