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facebook videos not playing in firefox. IE plays them fine, also no problem with youtube videos in firefox.

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Facebook videos are not playing in firefox, it plays youtube videos fine. The fb videos start to load and after that just a black screen remains.

No such issues in IE, I've no addons installed, flash player is latest, and tried by enabling/disabling the block popups option.

Thanks in advance.

Facebook videos are not playing in firefox, it plays youtube videos fine. The fb videos start to load and after that just a black screen remains. No such issues in IE, I've no addons installed, flash player is latest, and tried by enabling/disabling the block popups option. Thanks in advance.

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go to Help Menu -> select "Restart with Add-ons Disabled"

Firefox will close then it will open up with just basic Firefox. You can enable the Add-ons later. Check and tell if its working.

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Check if clearing the Cache helps:

  1. Go to Tools menu > Options > Advanced > Network.
  2. Under the Offline Storage section, click on the Clear Now button.

Otherwise, see the possible solutions in this article: Fix common audio and video issues.

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Ændret af Hasan den

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Thanks @dynamite and @mha007, but the problem still remains.

There were no conflicting plugins, vlc or any dlls.

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Valgt løsning

go to Help Menu -> select "Restart with Add-ons Disabled"

Firefox will close then it will open up with just basic Firefox. You can enable the Add-ons later. Check and tell if its working.

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You can try to disable the hardware acceleration in the Flash Player. See Flash videos won't play full screen

Flash "Display settings" window:


Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.

Update the Flash plugin to the latest version.

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Thanks @mha007, yes it worked for me.