1) Download the certificate by right-clicking this link and selecting Save Link As
2a) In FireFox, click Tools -> Options
2b) In Netscape/Mozilla, click Edit -> Preferences
3) Go to the Advanced option
4) Select the Certificates subsection
5) Click Manage Certificates
6) Click the Authorities tab
7) Click Import
8) Select Files of Type: All Files
9) Browse to where you saved the certificate, select it and click OK
10) Check all 3 boxes when it asks Do you want to trust "alonsystems.com" for the following purposes?
11) Click OK 3 times to close all the dialogs
12) Close your browser and re-open it.