Firefox provides the wonderful accessibility setting to override any website's css with custom colors and fonts, but this breaks some websites. I was wondering if there was any way (either by default, an add-on, or css-hack) to set custom colors and fonts per-website? Currently the only way to do this is to manually turn the settings off when you want to browse a website that it breaks - it would be very useful to have a website whitelist. At the very least it would be useful to have an "accessibility" button in the toolbar that turns on and off css overrides.

Thanks