I recently got a macbook and the first app I installed was Firefox. Unfortunately, I had to switch to Safari because of a bug that causes two windows of Firefox to open when opening external links. I could live with it at first, but it really gets annoying if you use your computer a lot. So what I'm asking from you is to check out the Bugzilla page and vote for this bug to get more attention. Also, if you're a guru, you might be able to help those nice Firefox people fix this quicker. Thanks!!

Bugzilla page: https://bugzilla.mozilla.org/show_bug.cgi?id=531552