This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox cannot play Facebook and Youtube Videos

  • 3 replies
  • 2 have this problem
  • 3 views
  • Last reply by thsecmaniac

more options

My Firefox 44.0.2 cannot play Facebook and Youtube Videos after I open Firefox for a while. I try to reopen Firefox but it's still not work. I need to restart my computer to make it work. This issue occur after I update Firefox to 43. Please help me

My Firefox 44.0.2 cannot play Facebook and Youtube Videos after I open Firefox for a while. I try to reopen Firefox but it's still not work. I need to restart my computer to make it work. This issue occur after I update Firefox to 43. Please help me

All Replies (3)

more options

The new Firefox uses ffmpeg by default, instead of gstreamer. To fix it, set `media.fragmented-mp4.gmp.enabled` to `false`. It works for some other people but do it on your own risk.

Modified by Ananyo

more options

@Ananyo:

Note that GStreamer only applies to the Linux platform and the OP is on Windows 10, so this doesn't apply.

Anyway the media.fragmented-* prefs have been replaced in Firefox 44 by plain media prefs.

  • media.fragmented-mp4.gmp.enabled -> media.gmp.decoder.enabled
  • media.fragmented-mp4.enabled -> media.mp4.enabled

Hi thsecmaniac

Are you playing the videos from start to end or are you stopping videos before they have finished?

more options

Ananyo said

The new Firefox uses ffmpeg by default, instead of gstreamer. To fix it, set `media.fragmented-mp4.gmp.enabled` to `false`. It works for some other people but do it on your own risk.

cor-el said

@Ananyo: Note that GStreamer only applies to the Linux platform and the OP is on Windows 10, so this doesn't apply. Anyway the media.fragmented-* prefs have been replaced in Firefox 44 by plain media prefs.
  • media.fragmented-mp4.gmp.enabled -> media.gmp.decoder.enabled
  • media.fragmented-mp4.enabled -> media.mp4.enabled

Hi thsecmaniac

Are you playing the videos from start to end or are you stopping videos before they have finished?

cor-el is right. I didn't see the "media.fragmented-mp4.gmp.enabled" option but I saw the "media.gmp.decoder.enabled" and " media.mp4.enabled" option. However, When I change the value of "media.fragmented-mp4.gmp.enabled" from false to true, It affect the sound in Facebook videos. So, I change the value back and then its sound is back to be good as usual.