Since updating to Firefox 5 I can no longer play Youtube videos. I get a black box with no audio or video. Youtube does work on Safari. I've updated Adobe Flash, with no improvement.
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In your Tools > Add-ons (or Firefox > Add-ons) do you have RealPlayer Browser Record or do you use any other similar tools that download videos from the web?
If so, can you disable them and restart Firefox to see if that helps. If not, try disabling Protected Mode in Flash with the following steps: http://forums.adobe.com/thread/1018071?tstart=0
We are working with Adobe right now to find out what exactly is happening.
Please read the article linked below for more info on this problem:
Flash 11.3 doesn't load video in Firefox
I was having this problem too. It is simple for Mac - clear the cache. Go to Firefox preferences, network and clear the cache. It should work then...it did for me.
I am getting a black box on Youtube and I am getting nothing at all with videos embedded on Facebook. It just goes white. I kind of regret updating Firefox now. :/
It was not the Firefox update as some 3.6.* users experiend it on Youtube also.
Try clearing the Cache in Firefox.
Tools-> Clear Recent History -> [v] Cache
or Tools->Options->Advanced->Network -> Offline storage -> [Clear Now]
Clear the Youtube cookie if above does not do it and reload the page. And if the video still by chance still does not load then try making the url in Location (address) bar start with https://
Youtube may have made some changes recently.
James says the truth, I've update firefox with the new 3.6 and youtube didn't work anymore. But the embed works.. And I notice now on youtube appears the avatars in the comments. Some big changes...
Btw, I've try to clear everything and still not working... [sorry for my bad grammar]
It may be a issue with Youtube as people with other browsers are getting the same. http://www.google.com/support/forum/p/youtube/thre
I think it's the flash player in general as I get problems on other sites, and it's only when flash is involved. Strangely on youtube i get no problems in 720p and 1080p, if I'm watching something in 480p or less and I change something on the player, like pause etc, it will just hang. The sound will continue but the video will freeze. It will also completely lock up Firefox until the video ends. This happened soon after I updated to FF5. I'm betting Adobe is to blame. Chrome works fine, downloading the videos and watching them in something like VLC is fine. What gets me is that it seems everyone is getting different problems. I'm not getting this black box problem.
This started happening to me just today! IE, Flash won't play with Firefox 5. It starts for a microsecond, then black video area expands and stays black; no video, no nothing. Was fine until today! [ I would like to know before Firefox upgrades itself; especially if changes not tested.] Grrr. I have Windows7; none of the suggestions worked [eg, turning off Adobe 'hardware acceleration', installing an older version of Adobe Flash, blah blah blah. Nothing works!] All is fine in Safari. Aggravating... :-(
I can download videos from youtube, using a firefox addon. But, I cannot view the videos on Youtube.com or on any other website if it is hosted at Youtube.