I am running Safari 5.0.1 on both my MacPro (OS 10.5.11) and my new MacBook Pro (new 2010 model w/ OS 10.6.4). Both Safari's have extensions loaded: MacPro: Reload Button, Amazon Search Bar, PageSaver, The New York Times MacBookPro: Reload Button, Amazon Search Bar Safari on my MacPro seems to be running fine. On my MacBookPro, I am experiencing slow downs, automatic quits and crashes. I will be in Yahoo mail for example, and some of the links to check for mail will not be active, which is a clue that it either will quit on me, or need to be reloaded several times before it responds. Most often, however, Safari quits. Has anyone experienced this with Snow Leopard? I've searched Apple's site and this, but have not found any relevant info. Thanks.