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Can't play some Youtube-Videos / Twitter "Your browser does not currently recognize any of the video formats available"

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Hello Everyone

I'm having troubles with playing some Youtube-Videos and Twitter Videos. I had to re-install my Windows 10 (64 Bit) due to some hardware-issues which are not related, and I'm having this issue since then. Here are the steps that I already did:

-Removing all Add-Ons -Starting in Safe mode - Deinstalling and reinstalling Firefox, then starting in safe Mode -Deinstalling Firefox with a tool that also deletes all Firefox-Related Registry Keys and App-Data Files and reinstalling it to a different path (other HD) -Disabling add-ons - Disabling Open264 Videocodec and widevine content decryption module (more just because of frustration^^, but I was then able to play some Youtube videos after this one) - mediasource.enabled is active (and all the other ones as well) -Installed addons (even though it didn't work with them disabled as well): NOscript( youtube videos are allowed, some of the are working), Ublock Origin, Video Download Helper, HTTPS Everyhwere, Tree Style Tab, Limit distracting sites - Updating to the newest Firefox-Version (which came out today)

Btw: on it tells me that everything works fine and I have of course the newest Firefox-Version installed.

Do you guys may have any other ideas?

Thank you for your help.

Kind regards,


Athraithe ag mcbob ar

Réiteach roghnaithe

If you have Windows 10 N or KN then you may not have the Media Feature Pack installed.

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Réiteach Roghnaithe

If you have Windows 10 N or KN then you may not have the Media Feature Pack installed.

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Thanks man, that helped! Guess i shouldn't have used the N-Version^^ (why would they not activate this...?)

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Glad to help. Safe Surfing.

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I have the same problem I do not play videos from youtube, twitter, twitch and Amazon's primevideo, they do not play me, primevideo mentions that the digital rights component is missing, tells me how to verify the widevine module, if it is active or update it, but everything it's okay; with another browser like Edge it works, Opera has the same problem as firefox,