Firefox freezes when I go to Youtube videos

As of yesterday, I cannot visit any Youtube video pages. The home page is fine, but whenever I try to go to any page with a video, Firefox freezes completely. I have Flashblock installed, but that doesn't seem to make any difference. I've tried uninstalling Flash and reinstalling to 10.3 - no difference. I'm running WIndows XP, FF 18.0.2. Does anyone know why this might be happening? I don't have this problem with any other browser, only FF.

I just removed [https://addons.mozilla.org/en-US/firefox/addon/video-downloadhelper/ Video DownloadHelper 4.9.15] add-on and voila, Firefox doesn't freeze anymore. If you have it you better remove it. It worked for me maybe it will work for you!
I think you know how to remove an add-on but if you don't, read below:
*In order to uninstall a possibly unwanted extension, please do the following:
#From the Firefox window click the Firefox button at the top left and select ''Add-ons'', or, if the Firefox button is not shown, click the ''Tools'' menu and click ''Add-ons''.
#Once the Add-on Manager has opened in a new tab, click the ''Extensions'' button on the left side of the window.
#You should now see a list of your installed extensions on the right side together with buttons on the right side of each extension.
#To remove an extension from Firefox, simply click the ''Remove'' button. You should see a message that informs you about the successful removal of the add-on.
#Note that some add-ons require a Firefox restart to be removed completely. To perform a Firefox restart after the add-on removal, click the ''Restart now'' link in the message.
*You can find further information about uninstalling extensions in the following articles: [[Disable or remove Add-ons]]

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