According to a BBC story:
“After 1 February, there will be no more active product support for Navigator nine, or any previous Netscape Navigator browser,” wrote Mr Drapeau.
“We feel it’s the right time to end development of Netscape branded browsers, hand the reins fully to Mozilla and encourage Netscape users to adopt Firefox,” he said.
I remember thinking Netscape Navigator was pretty cool when it first came out. That coolness has since evaporated along with floppy disks and dial-up modems.