Are the instructions to add a trusted site based on instructions for Internet Explorer? As far as I know, Firefox does not have the same concept of different "zones" as Internet Explorer. Could you describe the problem you're having with the site?

I have a secure site that requires specific settings. It wants me to allow ActiveX and add it to my trusted sites.

This is a site that I use for work. Normally I use IE at the office but I have been told that it should work with firefox as well.

Active X is only available on Windows computers.