"Consider the question of video codecs. The idea of an open
source codec would not be open if Firefox were not such a player in
browsers. Since it is a player its support of Ogg Theora matters,
while Microsoft's decision to go only with H.264 matters less.
"Or consider mobile. Here the game is the same. Apple supports
Sproutcore for mobile web apps. But the force is strong with
Google, and its support of Flash means Apple can't have it all its
"Or consider security. Explorer's reported interference with
Firefox would be Mozilla's problem if Microsoft market share were
closer to 90%. Now disgruntled users have a viable option, and the
problem of blocking .exe files is in Redmond's lap."