Version 9.0.0.5 (12-2007) is the final version of Netscape. It will remain 
now only as an add-in for Firefox to give you the old Netscape look and feel:

https://addons.mozilla.org/en-US/firefox/user/56836

Since Netscape 9 was just a base Firefox browser anyway this does not really
make that big if a difference any more.