The safari browser is chock full of security holes... just one new vulnerability after another. I advise uninstalling. You can always use one of the Firefox safari themes to make it look the same.
Read this for a few details on just one of the current holes:
http://blogs.zdnet.com/security/?p=1212
Plus, Safari is pathetic. If you want a speedy browser that still has lots of features, Opera is the way to go.

