Yah , Opera takes up 3mb and FireFox takes up 7mb but what does it matter? If your computer has 20GB of space at its hands (which is what I have and most people have around there). There are about 1000mb in a GB so you have 20,000MB. Taking up 7 of them will not slow down your computer. I dont know.....its just a matter of preferences , depending on what you like. Firefox is my style because it has a good Download Manager that can handle my downloads neatly , has a wonderfuly organized way to veiw my history , and the endless possibilities of extintions that allow me to create my own features