I have several Linux machines running Firefox, some of them run ver. 1.0.7 and some 1.0.8, but the newer ones are running the newest version. So, I am wondering why I can't upgrade. When I download ver. 184.108.40.206 to the desktop, and double click on it to extract files, I don't know what happens. It seems to go away. I guess I need a real basic instruction.