I remember using Mosaic on Silicon Graohics machines back in the early ‘90s. It’s was fab for the time.

And yes, Mosaic became Netscape, became Firefox. From the wiki page at https://en.m.wikipedia.org/wiki/Netscape_Navigator

The business demise of Netscape was a central premise of Microsoft's antitrust trial, wherein the Court ruled that Microsoft's bundling of Internet Explorer with the Windows operating system was a monopolistic and illegal business practice. The decision came too late for Netscape, however, as Internet Explorer had by then become the dominant web browser in Windows. The Netscape Navigator web browser was succeeded by the Netscape Communicator suite in 1997. Netscape Communicator's 4.x source code was the base for the Netscape-developed Mozilla Application Suite, which was later renamed SeaMonkey.[4] Netscape's Mozilla Suite also served as the base for a browser-only spinoff called Mozilla Firefox.