I am a PC to Mac convert. However, Macs are expensive. I work in human services so I don't have much money. I have to buy my macs used. I have an Imac G3 running Tiger at 400 MHZ and a clamshell laptop running Jaguar at 366 MHZ. Internet Explorer and Netscape Navigator are hell on the old OS and old macs. Even Safari 1.0 gives my clamshell a hard time. Not Firefox! It works well on my old macs. I can access Google docs and any site I like. I love Firefox. It is fast and trouble free!