The colors went wrong when Win8.1 installed and stayed wrong with a Firefox reinstall.
Background is black and text is mostly blue. This immediately occurred when I upgraded (?) to Win8.1 from Win8. I tried uninstalling Firefox and downloading and reinstalling and got identical results. I have disabled hardware acceleration in Settings. The machine is a 3 week old Gateway laptop "NE56R41u" cheapy from Walmart without screentouch. I just noticed that opening a link in a new tab no longer defaults to the new tab being on top. Note I can barely read this Support page as some of the blue on black highlights in the generally white text areas are unclear.
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Make sure that you haven't enabled an inverted High Contrast theme in the Windows Accessibility settings.
Make sure that you allow pages to choose their own colors.
- Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above"
Note that these settings affect background images.
See also: