Internet Browser: IE vs Firefox

As we know, Microsoft monopolize many software such as IE, OFFICE, FRONTPAGE... Because most of computers use windows operating system. So customers will default to use the softwares which with this operating system. After customers learn how to use these softwares and can use them easily, they may not want to use others softwares which are have the same fuction. Google has itself Internet Browser firefox. So how google break this monopoly and replace IE?
I've got some ideas, or some ideas which google is trying to do.
1.Make Browser more convenient and more easy to use. As the developing of technology, computer have more and more functions. But customers want it more easy to use and more simple.
2.Make it more safer. Virus is one of the biggest problems of computer, and most of virus are come through Browser. And also can protect customers password. So make it more safer, custumers will more likely to use it.
3.Cooperate with other websites and softwares. If firefox is better than IE, how customers know that? They can Cooperate with other websites and softwares. e.g. In some websites if people want to watch some videos or read something, it must use firefox to read it. In software, they can put firefox and popular software together, after people fix one software, it will ask if they want to fix firefox as well?
4.Advertising. I think advertising is easier for google. Google itself is a big website and it's a good place to advertising, so it have lower cost to advertising.