Mac comes with Safari much like Internet Explorer is built in Windows. However, it does not mean that a user should use the default browser given with a particular operating system. There are a lot of alternatives available for a user regardless of the operating system he or she uses. The same goes to the Mac Lion X.
Here are some browsers that are worth noting:
A name that might ring a bell to those using previous version of Mac OS, Camino is specially optimized for Mac OS X including Lion. A feature worth noting includes Keychain support along with all the other standard features that comes with a typical web browser.
Chrome is a favorite amongst PC and Mac users alike. Being one of the speediest and lightweight browsers has its advantage with all the other browsers. New features are also being implemented such as full screen as an API for this feature has been released along with Lion X
Being one of the oldest web browsers, Opera has a browser for almost all platforms. Improvements have been made on Opera Desktop for Mac. Like Chrome, it also took advantage of the new APIs inside Lion X. It also looks better than the previous versions as certain modification have been made to its styling.
New Lion X users should not hesitate in using any of these web browsers as an alternate to Safari. In fact, some of these even perform better than the latter.
I would not recommend Firefox for Mac Lion X because it is kind of buggy, most of the people who used it had some problems. So, until they will make an update I suggest staying away.