Controller panel position is wrong often

[Dreamer8]

Position of the navigation panel / toolbar is wrong sometimes.

Epic Games Store (not always):

Reddit (always broken, it's twice in one window):

Youtube:

No problem, works good here.

Position is broken also with some other sites.

Video Speed Controller 0.6.3.3, Firefox 98.0.2 (64-bit), Windows 10 21H1 64-bit, no system zoom, no firefox zoom used.