

Netscape Navigator was different software. It became the browser component of Netscape Communicator, then Mozilla Application Suite, then Mozilla Seamonkey, and has now been spun off from Mozilla and is just called Seamonkey.
Mozilla Phoenix/Firebird/Firefox was a from-scratch rewrite to make a minimalist standalone browser without the bloat of Mozilla Application Suite, where nonessential features could be added as extensions. (That’s why it was initially named “Phoenix”: because it was rising from the ashes of Navigator.)
(For the record, I am not so old as to have used Netscape 1.0.)
Please, oh please, fail to deposit my parents’ social security payment. I want to see the look on my dad’s face when he complains about it and then I ask him “so, is America great again yet?”