This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Full screen video doesn't take up the entire screen on MacOS 12.5 unless Firefox is in full screen mode

  • 2 replies
  • 1 has this problem
  • 31 views
  • Last reply by Hami

more options

When expanding any video to full screen mode, the video does not occupy the entire screen. However, if Firefox itself is in full screen mode, then the video will occupy the full screen.

I tested this on YouTube and another website's video player and was able to consistently replicate the issue.

See image to view the bug in action.

When expanding any video to full screen mode, the video does not occupy the entire screen. However, if Firefox itself is in full screen mode, then the video will occupy the full screen. I tested this on YouTube and another website's video player and was able to consistently replicate the issue. See image to view the bug in action.
Attached screenshots

Modified by Hami

Chosen solution

Found a fix from someone on Reddit.

Go to about:config and change "full-screen-api.macos-native-full-screen" to True.

Works perfectly.

Read this answer in context 👍 1

All Replies (2)

more options

Looks that Firefox adds a rounded border to make the player look nicer when you maximize the window and do not actually use full screen mode on Mac.

more options

Chosen Solution

Found a fix from someone on Reddit.

Go to about:config and change "full-screen-api.macos-native-full-screen" to True.

Works perfectly.