So you’ve gone to the trouble of buying and installing an SSL certificate. How do know you installed it properly? Some would just test the site by trying it with their browser. The problem is that Internet Explorer and Firefox validate the certificate path differently. Firefox will install an intermediate certificate while IE doesn’t. IE validates the shortest path, while Firefox validates the full path. There are other desktop browsers such as Opera, Safari, and Chrome and then the mobile browsers. The best thing to do is to use an OpenSSL based tool to do your checking.