Barely, if any at all. I'm not entirely sure though. Web browsers use about 40mbs of RAM.
If you have a desktop, and you're that desperate for RAM, you can get 1GB for less than $20: http://www.newegg.com/Product/Produc...82E16820161675
Although that is slow RAM, and it would slow down your preexisting RAM if it were faster. But you can still get faster RAM for fairly cheap.