Because mono cultures are not good. Because all platform controlled by one tech giant is not good. Because otherwise all sites will "build for IE6", ohh sorry,

Because mono cultures are not good. Because all platform controlled by one tech giant is not good. Because otherwise all sites will "build for IE6", ohh sorry, "build for Chrome". Because Mozilla is a non-profit and is more interested in protecting your privacy than Google who monetizes your lack of privacy.