Windows 7 - Firefox 10 stops resonding when starting a youtube clip.

So i've got a huge problem when it comes to my webbrower which have worked fine up until now. When i'm surfing the web it's all good times and no problems accure but when i enter Youtube and i start to watch any clip there it plays the first 2-5 secounds of video and sound then the movie freezes and the sound keeps on going normal for 5-10 secounds then that freezes as well and i can not close the webbrower during this at all. I have to ctrl alt del and close the Firefox proccess.

I have tried downgrading the client to Firefox 9.0, I have attempted to clear my cache and cookies but that did not help either. Have also dubble check so i have the latest Flash Player and i do.

The videos works just fine in google chrome.

Try Updating your Flash Player:
Adobe - Install Adobe Flash Player

Because Chrome has Flash Player built in.

Additionally reading Post #7 from this thread may help.

Please, Read before posting so i don't have to repeat my self.

Also making anew profile did not help in any way shape or form.

Try reading these 2 sites:

How-to fix the video lag in Firefox! | The Don's Craptastic World
How to Fix Annoying YouTube Jumpiness in Firefox

You could also see if it is the internet itself or contact your ISP.

It can not be the internet it self since it works on Chrome and Opera.

try updating to version 10.

Why are you not reading?
The topic clearly states I'm using version 10.

Try adjusting the Local Storage by right clicking on the video and choosing Settings.
You can also try disabling hardware acceleration.

I can not do that since the webbrowser is lockin down before i can get that far.

There has been an update.

Mozilla Firefox (v10) for Windows 10.0.1 - 2/10/12

Get More From Your Firefox — Mobile, Add-ons & Other Stuff

Update via Help > About Firefox > Check for Updates