I gave up trying to use dark themes in the browser due to the 'white flash' bug in chrome thats happened on and off for years.

here's a bug report about the issue from 2008 [0] and video of it happening from 2020 [1]. it's intolerable with dark theme stuff.

[0] https://bugs.chromium.org/p/chromium/issues/detail?id=311

[1] https://www.youtube.com/watch?v=e5sRlVwvQDE