Safari bug is the first interesting browser bug on my list. The bug was fixed in January 2010, fixed in Safari 4.1 and 5.0 (APPLE-SA-2010-06-07-1) Bug is caused by a loophole in the URL parsing algorithm specified 16 years ago in RFC 1630. When you open two windows in Safari – one pointing to http:hairy-spiders.com, and the other pointing tohttp:fuzzy-bunnies.com – the attack will only work as expected if the windows are opened by hand.”]
Source: http://lcamtuf.blogspot.com/2010/06/safari-tale-of-betrayal-and-revenge.html