1. Mozilla is an open-source web browser, designed for standards compliance, performance and portability. From Mandrake 9.0 RPM

2. Mozilla was the code-name behind the original version of the Netscape web-browser, which itself was essentially a re-write of the popular Mosaic web-browser. Netscape later created an open-source version of their source base called Mozilla. Netscape version 6 is based upon this newer Mozilla. Point: Both Netscape and Microsoft web-browsers identify themselves as being "Mozilla" in the User-Agent: field. When Netscape officially created the name "Navigator" for their web-browser, the engineers didn't bother changing this field. When Microsoft came out with version 3.0 of their "Internet Explorer", they attempted to emulate all the features of Navigator. In order to take advantage of web-sites that provided richer multimedia content based upon whether Mozilla was running, Microsoft put "Mozilla" as the version of their browser, with additional content identifying itself as "MSIE". From Hacking-Lexicon