Started to flicker block on the website in FF, what's the problem?

Started to flicker block on the website in FF, what's the problem? Helps disable smooth scroll or safe mode, but a few hours ago everything worked fine, what could be the problem? sevstud.ru/chat here a site, what my friends like, and does not flicker on the laptop (where ubuntu) too, all right.
September 19th 19 at 13:20
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