Very recently, I upgraded to Firefox 4.0. That's why I was surprised when I began getting bugged to upgrade to Firefox 5.0. Wait, huh? Did someone fat-finger the subversion commit? It seemed to me like it was time for a minor version release, especially considering some of my favorite plugins have not been upgraded for 4.0 yet.
Apparently, I'm not alone.
I went ahead and updated. I'm composing this post using Firefox 5.0. I am interested in some of the new features, like the Awesome Bar. At any rate, I still love my Firefox.
While I was at it, I went ahead and installed the PDF Browser Plugin for Mac (free for non-commercial use) so I could again open PDFs in my browser rather than always having to choose to download or open externally.