Whenever we enable full-screen video in Firefox, a message appears at the top of the screen that the website is now in full-screen mode. Exit full-screen (Esc), i.e. press Esc. And after a few seconds, this warning disappears from the screen.Esc key (Escape) – a key designed to return to the previous state (menu, screen) or exit the application or program (if the output in this way in this interpretation is provided by the application). The keyboard is usually located in the upper left corner.
Below I will tell you how to get rid of this annoying message, I’m sure it does not like the vast majority of users.
1. Open a new Firefox tab. In the address bar, type аbout:config, and then press Enter, and then click I accept the risk.
2. When the settings page opens, search for: full-screen-api.warning.timeout and double click on the number 3000.
3. In the additional window, set the value to 0 (zero) and click OK.
You can now close the settings tab. And you will no longer be concerned about this warning.
Note. This manual also applies to the Pale Moon browser, as it runs on the Firefox engine.
May the Force be with you,