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Why are the 720p and higher resolution options no longer available for Youtube videos?

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  • 1 has this problem
  • Last reply by philipp

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I recently changed to Mac OS X Version 10.9.5 and came with it Firefox 33.1.1. Now the 720p and higher resolution options are no longer available for Youtube videos. What should I do to access those options?

(Meanwhile, the Safari Version 7.1.7 (9537.85.16.12) on the machine has all the options.)

I'd appreciate it if you'd kindly tell what I should do.

Thank you,


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hi, please update firefox to the latest version (39.0.3 at the moment, firefox 40 is due to be released next week) as they contain support for "media source extensions" which is a prerequisite on youtube to play-back html5 videos in higher resolutions.

Update Firefox to the latest release