I originally posted this in the main Chyoa Forums, but I thought it'd be best to put it here. I am having issues with colors on the main site. Everything which was blue has become orange, everything which was black has become grey, except for body text which has become white, which would be fine, if the background weren't also white. Physically highlighting an item can help me see the text, but is difficult to read due to the orange coloring. Only happens when I log in (site is normal when I don't), doesn't happen with the mobile site. Currently using Firefox Nightly 35.0a1.
I'm using Firefox 32.0.3, which is the latest stable version and the site is ok here. Maybe reverting your Firefox version can fix the issue.
I just encountered this same issue tonight. Blue had become orange, some fields and mouse cursor highlighting was black, and the text was light on a light background. I'm uncertain which version of Firefox I'm currently using. My settings were set to the "Inverted" theme in hopes that its less glaring, more soothing darkness will one day be implemented for my browser of choice. I changed this option back to Standard and the issue corrected itself. When I switched back to Inverted, it returned. Keeping the theme set to Standard appears to circumvent this issue, although I've had mine set to Inverted for some time without this experience.