The speed of a browser? lolz. If I could select all, I would. They each have their own uses. Each one having its own advantage. It's great to see that you have much time in your life to test browser speeds! Also, IE 9 is in beta.
FF -or any other browser for that matter- doesn't include any plugins, you still have to get them yourself. Chrome can be faster, but on ancient machine in my sig it tends to be more sluggish than Firefox.Nah nah chrome is "the fastest" as it's lightweight and doesn't include plugins or add-ons or any other data adding programs inbuilt into the browser to essentially slow it down.