Opera Browser

[Grim]

Using Opera us just kinda like Firefox with some extensions already installed though.

Yeah, my point exactly. Opera is pretty robust in its own right, but it doesn't sacrifice other features so it could keep its small memory footprint... although after looking at that link I'm inclined to try K-Meleon on Windows. I've used Galeon for Ubuntu and I can vouch for it's speed and (too much) simplicity.

EDIT: Tried out K-Meleon. It is fast. Happy Mix.

EDIT2: Although I'll still be developing sites in Firefox. And in Linux. ;P