This site appears to use a scroll-linked positioning effect. This may not work well with asynchronous panning; see https://firefox-source-docs.mozilla.org/performance/scroll-linked_effects.html for further details and to join the discussion on related tools and features!
Zda se, až sedło wužywa pozicioněrowański efekt, kótaryž jo z kulanim zwězany. To njefunkcioněrujo snaź pórědnje z asynchronym pśesuwanim; glejśo https://firefox-source-docs.mozilla.org/performance/scroll-linked_effects.html za dalšne drobnostki a aby se diskusiji wó pódobnych rědach a funkcijach pśizamknuł!