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According to a white paper by Paypal, Safari lacks certain specific anti-phishing protections and EV SSL (Extended Validation Secure Sockets Layer) certificates. Paypal will in the first place just tell the users, that they are using those unsafe browsers. Later on Paypal will take steps to refuse access to Paypal at all, when users are still using those browsers. The main problem is, Safari is not safe from fishing attacks. According to MacNN Safari is the only browser to lag behind in comparison to other browsers like Firefox 2, Opera or Internet Explorer 7.
By the way: this article is written on the Mac version of Firefox…