Can't play videos youtube in HD since the upgrade to 24.0 FF

Hi, since I upgraded FF 23.0 to 24.0 FF, I am unable to change the video quality in Youtube in HD. The video plays on the low quality default setting, but if I change to 720 p or 1080 p, a black screen appears and it will not play. When I hover over the PlayBar at the bottom of the image, I see live still frames from the video.

Things that I've done or determined so far:

(1) the problem started with 24 FF. Who had the same addons before the problem started.

(3) started Firefox in safe mode with all the addons disabled. Problem is still present.

(2) open the same videos in Internet Explorer 10 and I am able to play the videos very well in any setting Hi-def available. So I think it means, it is not a Flash problem or computer problem.

(3) update the flash of shock to the 11.9.900.117 (after stage 2) Version. The problem is still present.

Any help would be appreciated.

Clear the cache and cookies only from Web sites that are causing problems.

"Clear the Cache":

  • Firefox/tools > Options > advanced > network > content caching Web: 'clear now '.

'Delete Cookies' sites causing problems:

  • Firefox/tools > Options > privacy > Cookies: "show the Cookies".

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem (switch to the DEFAULT theme: Firefox/Firefox/tools > Modules > appearance).

  • Do NOT click on the reset button on the startup window Mode without failure.

Tags: Firefox

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