[red-tea]

Firefox has the option to set default colours based on your theme, so mine are set to dark colours. However, I find that many sites become unusable because they assumed the user defaults would be black text on white background. I use Stylus to override things which sometimes works but not always. Is there actually a way to fix this?

[saagarjha]

This API, presumably, once websites adopt it and actually add CSS to support darker themes.

[red-tea]

No. This is a different thing. The problem is when people haven't coded their CSS correctly and assume default background is white and then set a non default foreground of black or something. Those sites will still break for dark themes even with this API.

In fact, if people actually understood the first C in CSS, this thing wouldn't even be necessary.

[leppr]

Dunno why you're being downvoted. This indeed is a very widespread problem. Even some Google services (like Google Docs) have it.

[mixmastamyk]

It generally happens when the site specifies the forgeround or background color but not both, leading to very low contrast.

[dao-]

> Is there actually a way to fix this?

In the color preferences, set "Override the colors specified by the page with your selections above" to "Always". By default Firefox does this automatically when the OS is in high contrast mode.