I don't subscribe to the dogma about tools. You should use what ever gets the job done. I personally use Firefox for debugging (I love FireBug). I use Safari for general browsing, mostly because of the integration of Bookmarks and Reading Lists over iCloud. And I dabble in Chrome when I'm using a non-apple machine. I think all tools are good and bad, and picking one side just limits your options for productivity. My 2 cents.