Hide 'Firefox View' in CSS for current Firefox (can't be hidden in about:config on Firefox 123)
While this is hidden on ESR via about:config, on FF 123, toggling all the options related to Firefox View in about:config does not hide these successfully in my testing. This CSS fix does this "the hard way".
This is mainly relevant for people on "current" Firefox. (Remember: Some distributions do not ship Firefox ESR (Arch Linux ARM))