Eriisa:

I use Fasterfox... yes, it does as it says but one thing to keep in mind, Its taking bandwidth from your local ISP.

U have some options in fasterfox, make sure you check them out..
(Default, Curteous, Optimized, Turbo Charged And Custom)

If you use Turbo Charged 24/7 your ISP will be charging you extra for the bandwidth LOL