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.

Solution 1:

Unfortunately, that's not currently implemented in Firefox (see Bug 1403085).

As a workaround, consider putting Firefox itself into fullscreen mode by clicking the green button in the title bar before making a video fullscreen.

Solution 2:

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.