Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

When exiting fullscreen videos, Firefox's window size changes to maximixed even if it was smaller pre-fullscreen

  • 5 cavab
  • 1 has this problem
  • 12 views
  • Last reply by jonzn4SUSE

more options

When I click the fullscreen button on a video, such as YouTube or Netflix, I find that upon exiting the fullscreen video and going back to normal screen, Firefox's window size is now maximized, when it was a smaller window before clicking the fullscreen button.

I am running Ubuntu 21.10 and I don't recall having the issue in previous versions.

When I click the fullscreen button on a video, such as YouTube or Netflix, I find that upon exiting the fullscreen video and going back to normal screen, Firefox's window size is now maximized, when it was a smaller window before clicking the fullscreen button. I am running Ubuntu 21.10 and I don't recall having the issue in previous versions.

All Replies (5)

more options

Hello,

I could reproduce this bug on 21.10 with Firefox beta 95.0b7.

This seems to be a known and unfixed bug. If you would like, you can post on its bug page so that someone is notified that people still have this issue.

https://bugzilla.mozilla.org/show_bug.cgi?id=1602713

more options

Try to rename/remove xulstore.json in the Firefox profile folder with Firefox closed.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).


You can try Firefox from the official Mozilla server if you currently use a version from the repositories of your Linux distribution to see if it behaves differently.

more options

I can confirm that an official build, from the Mozilla repos did not help, but renaming xulstore.json and restarting did.

Thank you cor-el (even though I never really noticed or cared about this bug lol)

Modified by Amelia

more options

cor-el said

Try to rename/remove xulstore.json in the Firefox profile folder with Firefox closed. You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

You can try Firefox from the official Mozilla server if you currently use a version from the repositories of your Linux distribution to see if it behaves differently.

Hi, Thank you for this quick response and helpful links. Renaming/removing xulstore.json didn't solve the issue for me and downloading from the official Mozilla server didn't change anything either. I'm going to keep researching and if I find anything that works for me, I'll share it here.

more options

I'm not able to reproduce in any version of Firefox. How about creating a short video showing the issue.