As others have mentioned, you must go to about:config and search for 'full-screen-api.allow-trusted-requests-only' and double click to change it to false. I needed to restart Firefox afterwards, but once I did the plugin started working as advertised. Very happy with this plugin, I now no longer have migraines when working in full-screen from the constant toolbar pop-ups!

this is best for me

Working for me, macOS Monterey. You have to click the content of the page first!

unsure about all the bad reviews, worked out of the box on macos mojave in firefox stable build

As previous reviews pointed out, you need to set 'full-screen-api.allow-trusted-requests-only' to false in about:config.

I love it! With THIS hint it works perfectly on my Mac: "type "about:config" in your Firefox address bar (like going to a website), click "accept the risk and continue". then search for "full-screen-api.allow-trusted-requests-only" and change it to false."

Brilliant! This works on Firefox when other options failed to hide the nav bar and tabs. 1st Tap the window so the top bar isn't activated. Press Ctrl+Shift+F. Easy! Using a keyboard shortcut doesn't add an icon to a crowded address/search bar. Press Esc to return. Now I can view online tutorials that show videos on their webpage without the distracting top bars. The window gets bigger, so it's easier to see details. Thank you Trishul~!!!

works as advertised! some advise for the (mac) users that don't get it to work tho: type "about:config" in your firefox adress bar (like going to a website), click "accept the risk and continue". then search for "full-screen-api.allow-trusted-requests-only" and change it to false. your firefox browser now stops blocking fullscreen plus.

1 little annoyance:

I often have to execute the shortcut 3 times or so before it works... bug?

(macOS)

Wonderful!

Awesome! Thought it didn't work at first because it doesn't work on mozzilla firefox pages and you might have to restart firefox. Thanks a lot

Does what it's supposed to, using the full screen Web API to also remove the title URL bar. Thanks.

1 thing: you might want to add the add-on icon to be a toggle for fullscreen?

Works flawlessly for me! (as of Feb 2019, FF 65.0)

I don't get what some of the other reviews are complaining about, because I'm really glad to finally have true fullscreen again in Firefox.

One limitation is indeed that you can't change the keyboard shortcut in the addon settings, but I solved it by using an external tool (Karabiner), mapped the standard cmd-shift-f to the addon's ctrl-shift-f shortcut.

Summary: Get this addon if you want real fullscreen back! And, thanks a lot Trishul for this addon.