Microsoft says it has developed a browser who's security is better than today's browser generation, called Gazelle, that's suppose to act like an operating system with the browser kernel exclusively protecting resources and sharing across Web sites.
Gazelle is still a prototype and it is said it's slower and uses more resources than IE 7, but an OS-like browser sounds good to me, as my Firefox already is almost an OS itself.
"Our prototype implementation and evaluation experience indicates that it is realistic to turn an existing browser into a multi-principal OS that yields significantly stronger security and robustness with acceptable performance and backward compatibility," Microsoft Research said.
All this info was released in a paper, by Microsoft Research so that doesn't mean they will actually go through with this project, but it's good to know they try to make a browser better than IE.