nsIHttpProtocolHandler in Firefox 3.0

 Get the application name.

 @return The name of this application (eg. "Mozilla").

 Get the application version string.

 @return The complete version (major and minor) string. (eg. "5.0")

 Get the translation of the application. The value for language
 is usually a 2-letter code such as "en" and occasionally a 
 five-character code to indicate a language subtype, such as "zh_CN". 

 Get/Set the application comment misc portion.

 Get the current oscpu.

 @return The oscpu this application is running on

 Get the current platform.

 @return The platform this application is running on
		   (eg. "Windows", "Macintosh", "X11")

 @return The product name.

 @return A product comment.

 @return A product sub string.

 Get the HTTP advertised user agent string.

 @return The vendor name.

 @return The vendor comment.

 @return The vendor sub string.