premise: Netscape Navigator was a web browser.
hypothesis: Netscape Navigator is a discontinued proprietary web browser , and the original browser of the Netscape line , from versions 1 to 4.08 , and 9.x . It was the flagship product of the Netscape Communications Corp and was the dominant web browser in terms of usage share in the 1990s , but by 2002 its usage had almost disappeared . This was primarily due to the increased usage of Microsoft 's Internet Explorer web browser software , and partly because the Netscape Corporation ( later purchased by AOL ) did not sustain Netscape Navigator 's technical innovation after the late 1990s . The decision came too late for Netscape , however , as Internet Explorer had by then become the dominant web browser in Windows . AOL maintains the Netscape website as an Internet portal .