This doesn't look right with the dark reader extension in firefox. I would expect a website that's compatible with dark mode to work with dark reader (I.e. I would expect dark reader to not influence the CSS in that case)
I would never expect a browser extension to work flawlessly with every possible site out there.
You are the user of the extension. Does it break a site? Submit a patch to the extension! Certainly don't complain to the website author who has no control over what extensions you personally use.
Oh wow, wanted to write "that does not exist", but finally found it unexpectedly under "configure website toggling". Thanks, that will remove a big annoyance if it works :D