I use Firefox as my regular browser, but that may be changing very soon. I recently discovered the web developer tools available for Safari and other WebKit browsers like Google Chrome. These features are almost identical to Firebug for Firefox, and that’s a HUGE plus for me.
To enable the developer extension, type the following into Terminal:
defaults write com.apple.Safari WebKitDeveloperExtras -bool true
Once you restart Safari, you should see an “Inspect Element” option if you right-click anywhere on a web page. So far, I am very impressed with the interface and debugging options it provides, along with the overall speed of WebKit browsers.