Most Youtube videos have an error

This started a few days ago, I have no idea how it started. Basically very many Youtube videos don't start in Firefox. They work fine in Chrome (although they don't seem to load instantly, takes a while to start). Here's a screenshot: http://i.imgur.com/z5XP0zU.png
What I've tried:
Reinstall Firefox
Reinstall Flash
Clear cache in both Firefox and Flash
New profile in Firefox
Change to HTML5 on Youtube (and turn off Flash in plug-ins)
The Youtube HTML5 page (https://www.youtube.com/html5) looks like this http://i.imgur.com/KlOSgOR.png. In Chrome it's all green.
Please help.

If I set media.mediasource.enabled = true, Youtube stops working completely if I have enabled html5. There's a never-ending loading screen on the flash player. The other combinations of html5 on and off and this true or false appear to be the same (error).
Yes I have cleared both cookies and cache, browser and flash.

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Firefox no longer plays embedded YouTube videos - message "An error occured, please try later"

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Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
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* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
In Firefox 4 you can use one of these to start in [[Safe mode]]:
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I use https and youtube videos show "an error occured, try again", i try clearing the cache and cokies, i try uncheck the hardware acceleration but no result

also i try set the security.ssl.allow to true but no result.
everything right with IE but problem only with firefox :(
please help me

Hi,
Does this happen in Safe Mode or with extensions/plugins disabled? [[Troubleshoot Firefox issues using Safe Mode]]
[Try the add on HTTPS Everywhere and disable youtube.com in the HTTPS Everywhere rules and I can watch YouTube videos in this Firefox profile as long as it's not over SSL]
In youtube you can also try to change the video quality or disable hardware acceleration.
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To disable hardware acceleration in Flash Player:
#Go to this [http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues Adobe Flash Player Help page].
#Right-click on the Flash Player logo on that page.
#Click on '''Settings''' in the context menu. The Adobe Flash Player Settings screen will open.
# Click on the icon at the bottom-left of the Adobe Flash Player Settings window to open the Display panel. [[Image:fpSettings1.PNG]] 
# Remove the check mark from '''Enable hardware acceleration'''.
# Click '''Close''' to close the Adobe Flash Player Settings Window.
# Restart Firefox.
This [http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html Flash Player Help - Display Settings page] has more information on Flash Player hardware acceleration, if you're interested.
Does this solve the problem? Let us know.

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When I attempt play most youtube videos, I get red hand and a message that states there is an error with playing this video. This has been going on every since Verizon has introduced this feature. I ignored it thinking they were trying to work out all of the bugs. So today December 28, 2010 decided to give the widget another try, still the same problem. Even when one video did play, the choppiness of the video was so bad, it was unviewable. Has anyone else experienced this problem and does someone at Verizon have a solution?

also if you are wireless on your pc and doing youtube, - then that may be a contributing factor.
if you're wireless on that pc that is doing media manager and youtube then try changing the channels of the wireless signal. you can do that in the router.   open a browser, and go to http://192.168.1.1
user name is admin. and the password is most likely the serial number found on the service tag of your VZ router unless you changed it.
Once you login succesfully, go to the top and hit wireless, then on the left basic security.   then go to option 3 which is channel
1, 6 and 11 and are the only channels you should try.
So it will likely be set to auto, change it to 11 and put the check for keep settings even after reboot (Directly under the channel) and then hit apply.,
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Also take a look at page 2 of Actiontec's Wireless PDF File. It gives you some idea's with regards to position and orientation of where the router sits and how it can best be positioned for maximum coverage.
http://support.actiontec.com/doc_files/MI424WR_Rev(all)_Wireless_Networking_Guide.pdf

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Maybe not as many people reply as you think should because this site doesn't freaking work either!
Took me ten minutes to log in! Kept getting stupid error messages telling me this site is undergoing maintenance. Whatever.
Same exact problem here, but Chrome DOES NOT work. Changing DNS servers DOES NOT work either. It doesn't work for a lot of people.
https://productforums.google.com/forum/#!topic/youtube/axsb7XPieK0
EDIT**
WTF this site is more broken than youtube! Constant errors and constantly unresponsive with "greyed out" buttons!
Is there any competent people left on the planet to fix this crap!?

HI! I have problem! When i install firefox buffering youtube videos going goood an next time two weeks later this video buffering have very big problem!

Hi!
I have problem with my firefox! This problem is buffering youtube videos. When i remove and next time install firefox youtube video going perfectly or for two weeks later youtube videos have big problem big big problem with buffering!
Thanks for help

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode

Most Youtube videos have an error

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