Works with an annoying popup for 5 seconds, please delete it.

It's really frustrating that an extension like this is the answer to a basic problem that firefox should solve by default. As others have said, it works, but the toolbar doesn't show up when you move your mouse to the top of the screen, and half the time the keyboard shortcut itself doesn't seem to work for unknown reasons. Giving 2 stars because it is useful in a pinch, but jeez.

I'm afraid I've had the same problem, ctrl+shift+F doesn't work. Using Quantum - 57.0

*Update*: Can't work out how to reply to my own comment. Yes, I needed it for a presentation which I was doing in reveal.js

Didn't work for me. Full screen still had tabs and bar on FF 57 and macOS 10.13.1. Same experience on FF 68 and macOS 10.14.5. Cmd+Shift+F and Cmd+Ctrl+F switches to full screen. Ctrl+Shift+F has no effect.