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Youtube videos freeze in fullscreen with Firefox, but not other browsers.

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New User

Youtube videos freeze in fullscreen with Firefox, but not other browsers.

I have been having trouble watching YouTube videos in Firefox over the last few weeks. Basically, the video will start up and if i keep it in the small video player mode it works fine. But if I click full screen the video will stop for several seconds, then catch up and repeat this to the end of the video. However the sound always plays continually throughout the video, even while the picture is frozen. I do not have this issue in Internet Explorer or Google Chrome, and it is only happening on one of three computers that I use Firefox on. I have run full scans in Malwarebytes Anti Malware, Kaspersky Internet Security, and Windows Defender, so i am fairly certain that it is not malware or a virus that is causing the problem. I have also tried the following solutions to no avail: Reset Firefox, Run Firefox in safe mode with no addons, Reinstall Firefox (plus another clean reinstall), Reinstall Flash player

I just can't seem to figure out what is wrong, and Firefox is my favorite browser so any help would be much appreciated.

1 ACCEPTED SOLUTION

Accepted Solutions
New User

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Before restarting my OS in safe mode I checked to see if I was still having the problem and now it is magically gone. I have made no changes at all since yesterday when it was not working properly and now it's fine. Kind of strange. Anyways thanks for all your help, this is why I love Mozilla so much.

8 REPLIES
Mozilla Support Contributor

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Some problems with Flash video playback can be resolved by disabling hardware acceleration in your Flash Player settings. (See this article for more information on using the Flash plugin in Firefox).

To disable hardware acceleration in Flash Player:

  1. Go to this Adobe Flash Player Help page.
  2. Right-click on the Flash Player logo on that page.
  3. Click on Settings in the context menu. The Adobe Flash Player Settings screen will open.
  4. Click on the icon at the bottom-left of the Adobe Flash Player Settings window to open the Display panel.

    fpSettings1.PNG
  5. Remove the check mark from Enable hardware acceleration.
  6. Click Close to close the Adobe Flash Player Settings Window.
  7. Restart Firefox.

This Flash Player Help - Display Settings page has more information on Flash Player hardware acceleration, if you're interested.

Does this solve the problem? Let us know.

New User

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Thanks for the reply ComputerWhiz. I tried that and it did not solve the problem.

Mozilla Support Contributor

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

Then perform these steps:

  • Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
  • In the Firefox options window click the Advanced tab, then select "General".
  • In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
  • Now, restart Firefox and see if the problems persist.

Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:

Did this fix your problems? Please report back soon.

Mozilla Support Contributor

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

  • On Windows you can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
  • On Mac you can open Firefox 4.0+ in Safe Mode by holding the option key while starting Firefox.
  • On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
  • Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

FirefoxSafeMode

Once you get the pop-up, just select "'Start in Safe Mode" Safe Mode Fx 15 - Win

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Please report back soon.

New User

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Sorry I couldn't reply the last few days. I tried those solutions and the problem is still present.

Mozilla Support Contributor

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

No problem.
Can you please try your operating system in safe mode?

To do so, please follow these steps:

  1. Ensure that your computer is shut down completely
  2. Press the power button
  3. Tap the F8 key repeatedly before the Windows logo and startup screen is displayed
  4. Select Safe Mode With Networking for the advanced startup options list

Please report back soon.


WARNING: Running your operating system with disable all security software (firewall, antivirus, etc.). Please only visit trusted sites while in safe mode.

New User

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

Before restarting my OS in safe mode I checked to see if I was still having the problem and now it is magically gone. I have made no changes at all since yesterday when it was not working properly and now it's fine. Kind of strange. Anyways thanks for all your help, this is why I love Mozilla so much.

Mozilla Support Contributor

Re: Youtube videos freeze in fullscreen with Firefox, but not other browsers.

I'm glad to help you (sort of).
If the issue starts again, please be sure to post on this thread.

Thank you for using Mozilla.