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Many youtube videos will not play in Firefox - I get the error message - "no video with supported format and MIME type found"

Posted

this is a recent problem - the videos play in Chrome and Explorer, but not in Firefox

this is a recent problem - the videos play in Chrome and Explorer, but not in Firefox

Additional System Details

Installed Plug-ins

  • Adobe PDF Plug-In For Firefox and Netscape 11.0.10
  • Google Update
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 11.31.2 for Mozilla browsers
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers
  • The plugin allows you to have a better experience with Microsoft Lync
  • NVIDIA 3D Vision Streaming plugin for Mozilla browsers
  • NVIDIA 3D Vision plugin for Mozilla browsers
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Shockwave Flash 16.0 r0
  • Adobe Shockwave for Director Netscape plug-in, version 12.0.7.148
  • iTunes Detector Plug-in

Application

  • Firefox 35.0.1
  • User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0
  • Support URL: https://support.mozilla.org/1/firefox/35.0.1/WINNT/en-US/

Extensions

  • Multi YouTube mp3 1.1.3 (d.lehr@chello.at)
  • Youtube HTML5 Video Player 0.1.6 (youtube-video-player@lejenome.me)
  • Norton Toolbar 2014.7.10.16 ({2D3F3651-74B9-4795-BDEC-6DA2F431CB62}) (Inactive)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription: NVIDIA GeForce GT 620
  • adapterDescription2: Intel(R) HD Graphics
  • adapterDeviceID: 0x1049
  • adapterDeviceID2: 0x0152
  • adapterDrivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
  • adapterDrivers2: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
  • adapterRAM: 1024
  • adapterRAM2: Unknown
  • adapterSubsysID: 097710de
  • adapterSubsysID2: 0000000c
  • adapterVendorID: 0x10de
  • adapterVendorID2: 0x8086
  • direct2DEnabled: True
  • directWriteEnabled: True
  • directWriteVersion: 6.3.9600.17111
  • driverDate: 7-2-2014
  • driverDate2: 5-16-2014
  • driverVersion: 9.18.13.4052
  • driverVersion2: 10.18.10.3621
  • info: {u'AzureCanvasBackend': u'direct2d', u'AzureFallbackCanvasBackend': u'cairo', u'AzureContentBackend': u'direct2d', u'AzureSkiaAccelerated': 0}
  • isGPU2Active: False
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • webglRenderer: Google Inc. -- ANGLE (NVIDIA GeForce GT 620 Direct3D9Ex vs_3_0 ps_3_0)
  • windowLayerManagerRemote: True
  • windowLayerManagerType: Direct3D 11

Modified Preferences

Misc

  • User JS: No
  • Accessibility: No
philipp
  • Top 25 Contributor
  • Moderator
5289 solutions 23366 answers

hello, please try to refresh firefox and see if this can address the issue...

hello, please try to [[Reset Firefox – easily fix most problems|refresh firefox]] and see if this can address the issue...
FredMcD
  • Top 10 Contributor
4224 solutions 58943 answers
'''[https://www.adobe.com/software/flash/about/ Flash Player Test Page]''' '''[https://www.youtube.com/html5 YouTube HTML5 Test Page]'''
cor-el
  • Top 10 Contributor
  • Moderator
17415 solutions 157316 answers

This happens if Firefox uses the HTML5 media player and can't play the media file.

Detecting Playback (HTMLMediaElement.prototype.canPlayType):

This happens if Firefox uses the HTML5 media player and can't play the media file. Detecting Playback (HTMLMediaElement.prototype.canPlayType): *https://developer.mozilla.org/Apps/Build/Audio_and_video_delivery/H.264_support_in_Firefox