Just done that test and my results are

Downstream actual= 927 Kbps (115.9 KB/sec) true= 1001 Kbps (inc. overheads)
Upstream actual= 243 Kbps (30.4 KB/sec) true= 262 Kbps (inc. overheads)

''FireFox is inherently more secure than IE. However, more secure is not equivalent to perfect. You have to understand that any code, no matter how secure, will contain bugs that need to be fixed. The fact that FireFox takes days to fix the problem (compared to weeks or months for IE) makes a huge difference when it comes to ongoing quality of security.''