How does Firefox work as a Web-Client Browser?

How does Firefox work as a Web-Client Browser?

Hi,
I recently installed the ZenOn Web-Server, and make it work properly with IE browser as a Web-Client.
But when I try it with Firefox browser, an error dialog is shown : " Please INSTALL_NPMOZAX ".
Although I tried to search the "NPMOZAX" on internet, now I have no idea what it is or how to install it.
Could you help me about it, in order to make my Firefox work for the Web-Client?

This is a migrated post! Originally posted on 02.06.2009 by user lephis. Please be aware that information can be outdated.