'''Firefox''' (not the fungus Foxfire) is a web browser and makes use of whatever internet connection you have that is provided by your Internet Service Provider. If you want to make Firefox be the default browser then in Firefox "Tools -> Options -> Advanced -> General / System Defaults -> (checkmark) Always check to see if Firefox is the default browser on startup -> Check Now" http://kb.mozillazine.org/Default_browser http://en.wikipedia.org/wiki/Internet_service_provider http://en.wikipedia.org/wiki/Web_browser