Yes. Safari and, I believe, Firefox, will not run on OS 8 or 9. They both require 10 to my knowledge. Regards, Ron Ron Pringle Web Developer MIS, City of Aurora > Thank you all for your suggestions. One common suggestion is > to be sure > that the MAC is running OS 10. What would be the limitation > of running a > G3 with Mac OS 8.6 with regards to client side web site testing? > > Does the OS version effect which version of Safari, FireFox > and IE which can > be run?