There's a fair few spyware / browser hijacking combos that work by intercepting javascript calls (logging form submissions, etc.)
Recent alterations to firefox have closed off this avenue, and forbid the redirection of javascript calls (unfortunately, pages don't timeout - but seem to just hang)
Can I suggest you scan for spyware (spybot S&D)
Additionally, there's been a few sites cropping up recently that intentionally fail to operate if they detect the browser is blocking ads (The ad serves an advertisment and in addition some vital piece of operational code - blocking the ad renders the page non-functional - seen this on crappy sites, haven't heard of any reputable sites doing this)
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