Google’s Browser Sync has made me switch to Firefox. Having cross-platform bookmarks has proven to be very useful. That said, I still miss the Cocoalicious goodness of an application written in Cocoa for Mac OS X and have been considering going back to Safari for OS X.
However, I found two extensions over the weekend that are keeping me interested in Firefox: Fission, which re-creates Safari’s progress bar inside the address bar (I don’t use the Staus Bar in Firefox. The Status Bar is disabled by default in Safari and I’ve gotten used to the extra 1/4″ of screen real estate). The other is Stop-or-Reload button. Again, this mimics the two-in-one simplicity that Apple brings you.
If you’re using Firefox and are a previous Safari junkie, I would recommend you grab these two extensions.