Yes, I have finally gone mad. After trying this way and that installing java into the Firefox, I had unwisely pressed cancel/stop in the middle of a (supposedly right way to install) installation of java. Now, everytime i start Firefox, there is the "Finishing Extension Installation" message coming up. After hours of tweaking my reformatted computer to perfection (the way I want it to be), and making it look nice as well with the UXtheme, I've completely gone despondent and MAD with this stupid error. I've uninstalled the firefox and java, deleted every possible registry key I can relate to to Mozilla or java, and even got to the point of resorting to the system restore point before I installed the java applet. The java is still there. That halfway installed extension is still there. Yes, this is a rant, a complaint, and expression of total frustration. But ultimately, this rant begs for advice on how to fix this problem. If anyone out there knows how to fix this, help me.