mousebutton.4th.enabled and mousebutton.5th.enabled are enabled (True)
Using Mozilla Mouse Event buttons page, shows as buttons 8 and 16 matching the Mozilla button Value as defined in below link. But FF should intercept these and not allow the 'Mouse Event Test Page' to even see these clicks (when compared to a working version of FF 101.0.1(64bit)).
https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons
