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I can't play video on Youtube after macOS wake up

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Hello, I have problem witch my firefox app on macOS. My Firefox app and MacOS is updated to nevest versions. When i run first time firefox app everything works ok, i can open youtube and play any video. After while when i snoze my system and again wakeup (i didn't turn off firefox app) i can't play any video on youtube. I wait a lot of time wich loading symbol. All other content on my page is loaded correctly. When i change a time of video, the video clip is changing but video is still freezed. I have none voice and none movie.

Thank you for your help in advance.

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I found the solution!

All I did was delete all the files in the temp folder.

Do the window's key + r and put this in it "%temp%"

After that you do ctrl + a (if mac then command + a) and right click and then press delete. Dump them away from the recycle bin and then that's it! I just figured it out after 4 minutes of my last post! :D

You could also uninstall Firefox then restart your computer then Reinstall Firefox and It should start working :)