[2ndbigbang]

I'm the opposite. Anything other than pure white on pure black for dark themes gives me eye strain. If you use the dark reader web extension you can adjust the brightness and contrast to your liking.

[dotancohen]

As it should be - the browser is termed a "user agent" for a reason. There should be browser settings for preferred dark (and light) colour schemes.

Actually - there are to a very small extent. But they are near useless, defining only the colours of uncoloured elements.