In a certan web page cannot open videos but sound available

after updating firefox the web page opens the video file dosen't open but sound works
when I open firefox on safe mode every thing works.
I deleted firefox and re installed the same no solution closed all apps did not change

If videos play in Safe Mode, it suggests that one of your extensions is causing the problem. You can review and disable any non-essential extensions here:
orange Firefox button ''or'' classic Tools menu > Add-ons > Extensions category
Any luck? If you want to post a list of your extensions for review, you can copy and paste them from this page:
Help > Troubleshooting Information

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