I took note that karen1573 feels that,

Netscape isn't supported by the FCK editor.

I don't know where you heard that ... I urge you to visit the FCK Editor home page.

On the right side of that page, you will see a section headed, "Compatibility"

... when you roll your cursor over the Netscape icon, you will learn that Netscape 7.1
(and subsequent releases) are supported.  ... When you roll your cursor over the OS
choices on the lower row of icons, you will learn that Netscape is supported in all
3 listed OS. 

--
Martin