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16 Dec 2011  
Bongo

Microsoft Community Contributor Award Recipient

Win 7 Pro x64 / Win 10 Pro
 
 

You may want to create a new profile to see if there is a problem with your profile or some extensions you can do this to test for problems.
Click on the Start Button and if you have it on the right side of the start menu click on Run if it is not there type "run" without quote marks in the search box and choose Run.
Can't seems to play videos from YouTube in Firefox.-1.pngCan't seems to play videos from YouTube in Firefox.-2.png


In the Run box type "firefox.exe -ProfileManager" without quote marks and click OK
Can't seems to play videos from YouTube in Firefox.-3.png


Click on Create Profile you can also uncheck don't ask at startup now.
Can't seems to play videos from YouTube in Firefox.-4.png


Follow the Wizard and click Next.
Can't seems to play videos from YouTube in Firefox.-5.png


Enter new profile name and click Finish.
Can't seems to play videos from YouTube in Firefox.-6.png


Make sure that you have unchecked don't ask at startup and select your new profile and click on Start Firefox. This profile manager box will open each time you start Firefox until you check the Don't ask at startup box again.
Can't seems to play videos from YouTube in Firefox.-7.png


After you have tested your new profile you can check the don't ask at startup box again and you will not get the profile manager starting each time you start Firefox.
Jerry


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