Google Docs is using the same shortcut. Could you consider adding an option to change the shortcut? Thanks!

For some reason it didn't work until I restarted Firefox, but now it works flawlessly. I use this add-on to remove distractions so I can concentrate on my work. Thank you whoever built this!

Superb. Works a treat and it does it quickly and looks absolutely perfect. Pressing ESC gets me back to the normal browser view, which is intuitive. There are many times, particularly, when I am writing or designing, that I like to go into total full screen mode (i.e. without the tabs and all the other clutter) and this does exactly that and does it more elegantly than anything else I have come across. Thank you for clearing up my screen so well :-)

UPDATE 2021-08-22:
Les Merlotta's trick for Mac from 2020-10 is still working on Firefox 91.0.1 Mac:
"Type "about:config" in your Firefox address bar (like going to a website), click "Accept the risk and continue". Then copy/ paste "full-screen-api.allow-trusted-requests-only" and change it to false."

OLDER COMMENT:
Thank you Trishul, good job. Running fine in macOS 10.10.13 High Sierra with Ctrl+Shift+F. I like that Cmd+Shift+F remains for the default full-screen behavior.

Just one request: please add an option page where to toggle if FS mode shall be left or kept when clicking onto a link (and maybe another option when leaving a domain).

As of 15 January 2018, this is the only add-on that will allow fullscreen functionality with no menu/nav bars on OSX 10.12.6 (FF 57.0.4). The browser.fullscreen.autohide function is broken for this machine configuration.

Feature request for this add-on: please add an icon that can be added to the menu bar that does the CTRL+SHIFT+F shortcut with one click.