I checked even in the mozilla "about:Config" web site, after a few lenghty readings, but still no answer, I re-downloaded nightly yesterday, I just give up, the hover color is white and the font is grey throughout different web sites. :( Even on the tabs on fire fox nightly. I am just wondering about moving to the plain firefox to see if that problem presists. Anyone can bail me out on my tired 42 years old eyes?!