gozilla is generally installed as a component of freeware programs such as kazaa. I will generally do research to find out what spybot software is being included with a program before I install. Mozilla has none that I could find, however, I did not install chatzilla, email and the other options available in the custom setup window. I also keep zone alarm running to alert me of any attempts to access the internet by my programs. If they try to access the internet without me being there, then they are immediately unloaded. I also regularly check my startup menu and registry for autoload programs, although I still have yet to disable messenger from starting everytime I start my email program.