Many versions of web browsers have come and gone, but the features we associate with modern web browsers are from Netscape Navigator, which was built on the foundations of Mosaic. While it wasn't the very first, Netscape was the earliest widely-used browser, setting an industry standard.

What was the very first Web browser?

The WorldWideWeb browser. The first web browser - or browser-editor rather - was called WorldWideWeb as, after all, when it was written in 1990 it was the only way to see the web.

Is Netscape still a browser?

The original browser was once the dominant browser in terms of usage share, but as a result of the first browser war, it lost virtually all of its share to Internet Explorer. Netscape was discontinued and support for all Netscape browsers and client products was terminated on March 1, 2008.