How To Disable Fullscreen warning message in Firefox

Like Chrome or Safari browser, whenever you play video on the whole screen or run anything which takes up your entire screen, Firefox warns about it. The message is shown for a few seconds before it disappears. If you find that annoying, then in this tutorial will share how to disable Fullscreen warning message in Firefox.

Youtube is now full screen

Youtube is now full screen

Why does Firefox display a fullscreen warning message?

You may receive a message like:

  • Youtube is now full screen
  • You are now fullscreen

The Fullscreen API is enabled to be activated when a use initiates it. It can either be with a mouse click or using the keyboard. The API enables the website to offer a different version of the website or the player which fits the full-screen way. This option can be used by a phishing website to automatically go full screen or provide an interface that may look similar to the real website.

See more: How to get out of Fullscreen on Chrome

This article is talking about video players or anything similar which goes full screen when you use the mouse or press a shortcut.

How to disable The “website is now full screen” warning in Firefox

First, you will need to access the Advanced Preferences Page. To do that, follow these steps:

1. Launch Firefox browser.

2. In the address bar, type “about:config” and then press Enter key.

3. A new page opens up. It will warn you about the result of changing the core preferences. Click on the “Accept the Risk and Continue” button

3. In the next screen, look for full-screen-api.warning.timeout in the search bar.

4. When it displays, click on the pencil icon next to the setting to change the value.

How To Disable Now Fullscreen warning message in Firefox

Disable Fullscreen warning message in Firefox

5. You can now set the value as 0 to disable it absolutely.

If you would like to go back to the same setting or revert, simply click on the reset arrow to revert to the default value.

You may also like: How To Enable Fullscreen notifications in Windows 10

VIDEO TUTORIAL: How to disable is now full screen notification in Firefox

Hope something helps you.

How To Disable Fullscreen warning message in Firefox
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