It hangs at ak.static.facebook

it hangs at ak.static.facebook as well as ebaystatic, and other websites with either 'ak' or 'static' in the redirect bar. I've deleted and redownloaded my browser, tried to delete the cache and temp files (never know if that works, or if it stores regardless of deleting attempts), disabled and uninstalled add-ons that could be interfering (such as adblock plus), deleted the actual profile folder in windows explorer (start menu), reset the router and modem and rebooted my computer multiple times, tried internet explorer instead of firefox, ran antivirus and antispyware software (spybot found no infections, neither did McAfee), and I used the cleaner and defrag multiple times to make sure my computer wasn't running slow for a silly reason. The websites that I know about (and frequent) are facebook, myspace, and ebay. All of the other websites seem to be fine (of course I don't know of every single one out there)... I fix this problem temporarily, but it always comes back within 30 minutes of either disabling an add-on or downloading the browser fresh. What's my problem?!!!