I see from previous threads some have had the same problem as me, firefox crashing due to AVG8 safe search add on which must have come in one of the updates. If you click on a link in Google before AVG has finished checking all the links Ffox freezes and crashes etc. To resolve just disable the add on in Firefox/tools/add ons/ extensions. You don't then get the error (!) on the AVG icon and AVG8 carries on happily...so far anyway.... Hope that's helped.