Try Nvidia vaapi driver! On arch you gotta make sure you setup hardware acceleration no matter what hardware your rocking.

I think Firefox defaults to Wayland now but you can check by going to about:support in Firefox and seeing if it’s running in Wayland or XWayland. Hardware video acceleration isn’t supported in XWayland as far as I can tell. I don’t know about chrome you’ll just half to look that up your self.