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Ouch, that extension is really broken (it makes tons of invasive changes to every site you visit, I'd be surprised if it didn't break lots of sites). Thanks, I'll detect it and show a message to let anyone else using it know.
black screen + fix.
so I had a black screen whenever i visited pixiv with ppixiv on, now i thought what could be the problem on my end.
it was a browser extension called "Dark Reader", after disabling it, ppixiv works as usual. I should have thought about this earlier...