I am currently running Firefox 3.0.5 as my default browser. Ever since I installed Norton Internet Security 2009, Firefox crashes and closes about once every 15-20 minutes. I never had a problem with Firefox until I installed NIS. There is no such problem with IE 7, but I just don't like using it. Has anyone else had this problem? Could it be the Phishing filter NIS installs? As an aside, is Trend Micro Internet Security as bad in detection as most tests seem to indicate? I had thought of switching to it if my Firefox crashing continues with NIS.