 and conditions apply all right whether you have a pc or mac it has a built-in firewall but how do you know if it's really working well here's the million dollar question you want to go to a free browser test called shields up it's going to tell you the answer for free once again that's shields up it's at grc.com once again grc.com hey stay right where you are we have more of your phone calls coming up you don't want to miss