I've used a CAC card for logging in to military sites for six years, but in Firefox 7.0.1, I can't. I've tried in internet explorer 9, and chrome, and it works fine. I checked drivers, and they're up to date. I never had a problem with previous versions of Firefox working with my CAC card, and reader, but now it won't. Installing the DOD certificates is another ball of wax. Firefox won't take them. The other browsers have no problems with the DOD certificates.