The Book of Mozilla is a computer Easter egg found in the Netscape and Mozilla series of web browsers which is viewable by typing "about:mozilla" into the browser's address bar.

There is no real book entitled The Book of Mozilla. However, apparent quotations hidden in Netscape and Mozilla give this impression by revealing passages in the style of apocalyptic literature, such as the Book of Revelation in the Bible. When about:mozilla is typed into the location bar, various versions of these browsers display a cryptic message in white text on a maroon background in the browser window.