NetSpell is not working on FireFox

I followed the instruction I found on, http://nlakkakula.wordpress.com/2008/06 ... fckeditor/, and I was able to get NetSpell to work with FCKEditor on IE 7.0. When I open the app on FireFox 3.0.1, a popup comes up and embedded in it the SpellCheck.aspx page. There is a cancel button on the popup and it works. All controls on the SpellCheck.aspx page are disabled except the cancel button on that page, which does not work. There are no suggestions loaded into the SpellCheck.aspx page for FireFox. Is there some additional work needed before FireFox will display the SpellCheck.aspx page correctly and without being embedded in the popup, and work correctly?

Thanks