Yea, I'm a loyal Firefox fan as well. It's familiar and it works w/o too many drastic changes. However, I only use 1-2 plugins (at the most) and I don't keep a facebook (or any other social media) tabs or sites open in a browser. I use Empathy for Google Talk, Skype, Facebook, and all my other chat & video protocols. (yes, Facebook is just another chat protocol to me). Web apps are kind of a joke to me as well, as is the "Cloud."
**LINUX**
On a side note, for any Gnome users out there, give the newer releases of Opera a try. I know it's not F/LOSS, but it has used GTK+ for the past several releases and integrates well. I avoid QT libraries as much as possible, that is why I mention this.
**LINUX**