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FF56. Youtube at 60fps drops the majority of the frames.

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After updating to FF56, youtube videos playing at 60fps no longer works properly. It drops most of the frames and the video is very jittery. It was not a problem prior to this update. I tested by starting FF in Safe Mode and the problem went away. I have 2 extensions, Greasemonkey and Ublock Origin. I restarted FF normally and disabled Greasemonkey and the problem happened again. I disabled Ublock and the problem continued.

What else is disabled in Safe Mode that could be causing this issue to occur? I have 3 plugins and they were all enabled even in Safe Mode. I tried enabling/disabling "use recommended performance settings" and nothing changed.

After updating to FF56, youtube videos playing at 60fps no longer works properly. It drops most of the frames and the video is very jittery. It was not a problem prior to this update. I tested by starting FF in Safe Mode and the problem went away. I have 2 extensions, Greasemonkey and Ublock Origin. I restarted FF normally and disabled Greasemonkey and the problem happened again. I disabled Ublock and the problem continued. What else is disabled in Safe Mode that could be causing this issue to occur? I have 3 plugins and they were all enabled even in Safe Mode. I tried enabling/disabling "use recommended performance settings" and nothing changed.
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 27.0 r0

Application

  • Firefox 56.0
  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:56.0) Gecko/20100101 Firefox/56.0
  • Support URL: https://support.mozilla.org/1/firefox/56.0/WINNT/en-US/

Extensions

  • Greasemonkey 3.17 ({e4a8a97b-f2ed-450b-b12d-ee082ba24781})
  • uBlock Origin 1.14.10 (uBlock0@raymondhill.net)

Javascript

  • incrementalGCEnabled: True

Graphics

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  • adapterRAM: Unknown
  • adapterRAM2: 1024
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  • adapterSubsysID2: 046e1028
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  • directWriteVersion: 6.2.9200.22164
  • driverDate: 7-28-2010
  • driverDate2: 1-9-2015
  • driverVersion: 8.15.10.2189
  • driverVersion2: 9.18.13.4725
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  • webgl1Version: OpenGL ES 2.0 (ANGLE 2.1.0.dec065540d5f)
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  • webgl2DriverExtensions: -
  • webgl2Extensions: -
  • webgl2Renderer: WebGL creation failed: * Error during ANGLE OpenGL init. * Error during ANGLE OpenGL init. * Error during ANGLE OpenGL init. * Error during ANGLE OpenGL init. * Error during ANGLE OpenGL init. * Exhausted GL driver caps.
  • webgl2Version: -
  • webgl2WSIInfo: -
  • windowLayerManagerRemote: True
  • windowLayerManagerType: Direct3D 11
  • windowUsingAdvancedLayers: False

Modified Preferences

Misc

  • User JS: No
  • Accessibility: No

Question owner

SOLVED: It was hardware acceleration. I disabled it and it fixed the problem. Previously I only unchecked use recommended performance settings.

SOLVED: It was hardware acceleration. I disabled it and it fixed the problem. Previously I only unchecked use recommended performance settings.
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