I was just looking at the IE vulnerabilities vis-a-vis Firefox compiled by Secunia. Before going further you have to understand that IE has been much longer than Firefox and hence have been more extensively looked at for vulnerabilities.

Contents NailGun Introduction Rationale for Porting Compiler choice: MinGW versus CygWin Mini Porting guide from Linux to Windows (networking focussed) Testing Code & Executable Download Suggestions for improving NailGun