I don't know what this exists for. What I do know is that it is not a fork of Mozilla Firefox; the Netscape browser entity is Chromium. There is a "Download Browser" link in the footer in https://isp.netscape.com/ . Click on it to download.

do not click auto download, no prompt or webpage pop-up.

For that reason I have flagged this post.

How can I flag this post?

You need 31 karma to flag and 51 to downvote. Here you got 1! Use the flag and downvote wisely when you get them.

More info in the unoficial collection by minimaxir https://github.com/minimaxir/hacker-news-undocumented

Thanks man!