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I have a suggestion! Make a skin instead. You can have it set to dark colors and you shouldn’t ever get that flash :)
or use the reversi skin, it’s one of the pre-made site skins and is basically dark mode
100% vouch for the Reversi skin. I've had it for years + if I ever see a white background it lets me know that i got logged out LOL
I do use that skin but I think it’s just my browser 😞😞😞 Sometimes in between page loads I’ll get flash banged