Firefox on macOS: Use native fullscreen on videos Is there a way to make Firefox use Mac's native fullscreen when watching a video (e.g. on Netflix)? The browser does go fullscreen, but it's not on it's own space on macOS.

I'm currently using Firefox 57 and macOS 10.13.1.
This is now supported in modern builds of Firefox (appears to be implemented since version 70). However, it is not enabled by default. Go into about:config and set full-screen-api.macos-native-full-screen to true.