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You seriously have to ask? Pop-up blockers were invented for a reason. Things that jump out and demand your attention are annoying, period.

Thank you for your feedback. I have removed the pop-up for now. No warning about the ugly readability experience in dark mode.

if you really care about it, can already detect it, and show a pop-up, surely it'd also be doable to show a header or something?

as others have said, the pop-up is really the issue here.