It was just a notice from my side "WHOOKIDSON".
You can always use sniffers like "URL snooper" and many others mentioned on this site to find the samme correct link as with the Firefox addins!, but I think your problems is more with your Internet network provider or there could be som virus or other things on your computer, causing it to hang. You can also try to delete your cache(clean your computer) with CCleaner before your try a few times more.
http://www.piriform.com/ccleaner/download