I'd recommend Firefox but each to his own. When I changed to Apple three years ago I abandoned Firefox and IE and became a true Apple Safari monk, but I've been back to using Firefox this last week and what do you know.. it's great..
Absolutely Bob.... If you had a 27 inch iMac skating accross the screen to open tabs is painful. On my Macbook Air I did not "upgrade" to Safari 6 and I still use it. If I could roll back on the iMac I would but Firefox is good.
Well, you can use ⌘+W to close active tab and ⌘+T to open new tabs. I know it takes some time to get accustomed to, but once you get used to using it, you won't use your mouse, cause it's faster and easier.