You are running a rather old version of avast!, so it is probably worthwhile to upgrade to the latest release 5.1.889. By abort, do you mean from Webshield? Have you done a reboot? Sounds like something has crashed.
Sorry I should have told you, but I am running 5.1.889, on the Dell.
Yes, Web Shield is responsible for these Aborts.
I cleared my cache and restarted Firefox, but did not reboot my system.
I rebooted my system, allowed the pages to reload in Firefox, and it is still aborting almost every page on that search. They are all different websites, so I feel avast somehow screwed up with it's last update.