BOOYA! I've been going round and round with this issue all week, but tonight... SUCCESS! First, go into the device manager where you've been trying to create modules and unload anything you've recently created. There will probably only be 2 left: NSS Internal PKCS #11 Module and Builtin Roots Module (at least those are the only other two I have). You're insuring that no module is already trying to govern CAC access. Next, if you're a neat freak like me, go under your user folder and get rid of that 'usr' folder that CoolKey probably created (although I'm sure it's not hurting anything if you're afraid of deleting something important). Now, the new library you're looking for is called CACKey. A quick Google search should find it. Unfortunately, you may need a CAC to even access it, so you may have to download at work and email the .tar or .pkg file to yourself. But if you've been messing around with this stuff then that shouldn't be too complex. Once you have that file (for me, I just downloaded the Snow Leopard version), it's cream cheese: open the file, it'll run an installer and put the files in one of two places (which it tells you before the install, and you can always re-open the package to re-read the locations). Now back into Firefox, load a module the way you've been trying, and, hopefully, you're in. Hope this helps! P.S. I'm on Mac OS 10.6.8 and Firefox 5.0.