Using Gentoo with KDE Plasma 6.1.4 with wayland and Firefox 130
I rebuilt Firefox disabling wayland support ( for Firefox only and this will force Firefox to use Xwayland ) and the high CPU usage problem is massively reduced or gone
I’ve also noticed the bouncy, overscrolling thing in Firefox is disabled ( good, I don’t like it )
I think it’s a bug in Firefox when it’s using wayland