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media.windows-media-foundation.enabled option not in about:config after upgrade

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videos play fine in firefox 35.0 but not in any upgrade version since(including 42.0) troubleshooting between the 35.0 and 42.0 , i noticed the media.windows-media-foundation.enabled option is not in the about:config list when i upgrade from 35.0 to anything newer if i roll back to 35.0 , media.windows options are in the about:config again no luck when i toggle the plugins.addons,enable as suggested in support solutions

videos play fine in firefox 35.0 but not in any upgrade version since(including 42.0) troubleshooting between the 35.0 and 42.0 , i noticed the media.windows-media-foundation.enabled option is not in the about:config list when i upgrade from 35.0 to anything newer if i roll back to 35.0 , media.windows options are in the about:config again no luck when i toggle the plugins.addons,enable as suggested in support solutions

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I do not know if the compatibility or code was removed, but you can try to add the entry back by right clicking on the about:config page and adding a new entry.