In its heyday back in the 1990s, Netscape Navigator was probably the best web browser available and, as a mainly Mac user, I used to prefer Netscape Navigator and Communicator over the alternative Microsoft Internet Explorer before we were introduced to the likes of Safari, Mozilla and Camino, etc. It'll be sad to see it die off completely but it had been pretty awful as a browser since the diabolically bad version 6 and had only recently been rebuilt using the Firefox source code.
It's gone kind of full circle really since it gave birth to the Mozilla foundation when the Netscape code was released to the Open Source community. I suppose you could Firefox and Thunderbird are its progeny and with those as successfull as they are, it can now pass away quietly into history - R.I.P. Netscape!