With a fully up to date system, I am getting graphical corruption in firefox using a 9070 xt. Firefox is version 154.0-1 and mesa is 26.1.7-1. Sometimes youtube messes up, but it’s not just video websites. For example if I browse this site long enough it might happen. It did seem to go away downgrading firefox, but that’s not a long term solution.
Go to Display Configuration settings and change the Adaptive Sync to Automatic. Reboot and report back if the corruption is resolved.
What DE is used?
Package versions do not matter much on a rolling release latest is always latest.
You can check versions over https://archlinux.org/packages/ to sleep if system is partly updated.. but if update was running without error..