ⓘ The Book of Mozilla


ⓘ The Book of Mozilla

The Book of Mozilla is a computer Easter egg found in the Netscape and Mozilla series of web browsers. It is viewed by directing the browser to about:mozilla.

There is no real book titled 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.

There are seven official verses of The Book of Mozilla which have been included in shipping releases, although various unofficial verses can be found on the Internet. All seven official verses have scriptural chapter and verse references, although these are actually references to important dates in the history of Netscape and Mozilla.

The seven verses all refer to the activities of a fearsome-sounding "beast". In its early days, Netscape Communications had a green fire-breathing dragon-like lizard mascot, known as Mozilla after the code name for Netscape Navigator 1.0. From this, it can be conjectured that the "beast" referred to in The Book of Mozilla is a type of fire-breathing lizard, which can be viewed as a metaphor for, or personification of Netscape.

While part of the appeal of The Book of Mozilla comes from the mysterious nature, a knowledge of the history of Netscape and Mozilla can be used to extract some meaning from the verses. Furthermore, the Book of Mozilla page has annotations for each of the first, second, third and fifth verses hidden as comments in its HTML source code. These comments were written by Valerio Capello in May 2004 and were added to the Mozilla Foundation site by Nicholas Bebout in October that year. Neither Capello nor Bebout are core Mozilla decision-makers; and there is no evidence that Capellos interpretations received any high-level approval from the senior management of the Mozilla Foundation.


1. The Book of Mozilla, 12:10

The Book of Mozilla first appeared in Netscape 1.1 released in 1995 and can be found in every subsequent 1.x, 2.x, 3.x and 4.x version. The following "prophecy" was displayed:

The chapter and verse number 12:10 refers to December 10, 1994, the date that Netscape Navigator 1.0 was released.

The Book of Mozilla page, which includes four of the verses from The Book of Mozilla, contains the following explanation in its HTML source code:

The "beast" is a metaphor for Netscape. The punishments threatened towards the "unbelievers" most likely users who didnt conform to standards are traditionally biblical but with the strange threat that their "tags shall blink until the end of days". This is a reference to a feature in early versions of Netscape that would make bad tags blink, as seen in the source code comments from the Book of Mozilla.


2. The Book of Mozilla, 3:31

On May 10, 1998, Jamie "JWZ" Zawinski changed The Book of Mozilla verse to reference the fact that Netscape had released its code as open source and started the Mozilla project. This verse was included in all Mozilla builds until October 1998, when a rewrite of much of the Mozilla code meant that the Easter egg was lost. On February 5, 2000, Ben Goodger, then working for Netscape, copied The Book of Mozilla verse across to the new code base. It was included in all subsequent Mozilla builds until the introduction of the 7:15 verse, Netscape versions 6 to 7.1 and Beonex Communicator; it still appears in Classilla due to that browsers unusual history.

The verse states:

The chapter and verse number 3:31 refers to March 31, 1998, when Netscape released its source code.

The Book of Mozilla page has the following comment in its HTML source about this passage:

Again, the "beast" is Netscape. The text probably refers to Netscapes hope that, by opening its source, they could attract a "legion" of developers all across the world, who would help improve the software with the "din of a million keyboards". The "legion" is actually a reference to the biblical quote Mark 5:9 in the King James Version KJV bible, since The Book of Mozilla is presented as a sort of "computer bible" with prophecies. "Mammon" refers to Microsoft, whose Internet Explorer browser was Netscapes chief competition. The word "mammon," in various Semitic languages, is related to money and riches; it appears in English translations of the Bible, and is sometimes used as the name of a demon of avarice. It may therefore imply not only that Microsoft has vastly greater funds to draw on, but that it has greedily abused that fact to further its own position in the marketplace; it also highlights the difference between the purely commercial development of Internet Explorer, and the new community-driven development of Netscape/Mozilla. "Red Letter Edition" may be a reference to so-called Red Letter Editions of the Bible, which print quotations by Jesus in red ink. It could also be a reference to a fact that March 31, 1998 was a red-letter day for the Mozilla project.


3. The Book of Mozilla, 7:15

The next installment of The Book of Mozilla was written by Neil Deakin. It is included in all versions of Mozilla released from September 2003 to July 2008 Mozilla 1.5 – Mozilla Firefox 3.0 Beta 2, all versions of Camino, all versions of the Mozilla Thunderbird email client until, all versions of the SeaMonkey application suite until 1.1.19, the Epiphany web browser version 1.8.0, the Minimo Pocket PC web browser, and all Netscape versions from 7.2 to 8.1.3 except some Netscape Browser prototype releases:

The 7:15 chapter and verse notation refers to July 15, 2003, the day when America Online shut down its Netscape browser division and the Mozilla Foundation was launched.

In the HTML source of Book of Mozilla page, this verse is accompanied by the following annotation:

The "beast" falling refers to Netscape being closed down by its now parent company AOL. The "great bird" that rises from the ash is the Mozilla Foundation, which was established to continue Mozilla development. The bird rises from the ash like a phoenix – a reference to the original name of the Mozilla Firefox browser known as Firebird at the time this verse was written. The bird casts down "fire" and "thunder" on the "unbelievers", which is a direct reference to the Mozilla Firebird now Firefox and Mozilla Thunderbird products, which became the main focus of Mozilla development a few months before the events of July 15. The fact that the beast has been "reborn" indicates that the spirit of Netscape will live on through the Foundation which is made up mostly of ex-Netscape employees and its strength has been "renewed" as the foundation is less reliant on AOL who many feel neglected Netscape. Again, "Mammon" is Microsoft, Mozillas main commercial competitor.


4. The Book of Mozilla, 8:20

Netscapes Lead browser engineer Christopher Finke contributed the next verse of The Book of Mozilla. It was first made public in the June 5, 2007 release of Netscape Navigator 9.0b1. The verse was included in all subsequent versions of Netscape, until the final discontinuation of the browser Netscape Navigator 9.0b1 -

The 8:20 chapter and verse notation refers to August 20, 2006, when the first internal email was sent mentioning the possibility of developing the next Netscape Navigator in house.

Unlike previous verses, the HTML source for the Book of Mozilla page does not feature any verse-related annotations.

The "Creator" refers to Netscape the company. There are two interpretations of the verse: the phrase "beast reborn" appears in the previous verse referring to the Mozilla Foundation and "it was good" could be a tribute to everyone who contributed to the Mozilla project. "Beast reborn" could also be a reference to Netscape reopening their browser division instead of outsourcing development; Netscape Browser 8 was produced by Mercurial Communications.

This verse is a parody of Gods creation of Earth described in Genesis 1:4, 1:10, 1:12, 1:18, 1:21, 1:25, 1:31 of the Bible. It also may be referencing Luke 3:22 of the Bible.


5. The Book of Mozilla, 11:9

This verse landed in the Mozilla trunk codebase on January 9, 2008. It was included in Firefox 3.0 Beta 3 – Firefox 20.0.1, SeaMonkey 2.0 Alpha 1 – 2.17.1, Thunderbird 3.0 Alpha 1 – 20 Beta 1, Alpha 1 version of Mobile Firefox, Flock Browser Version 2.0.6, Waterfox and Songbird.

In the HTML source of the Book of Mozilla page, this verse is accompanied by the following annotation:

"Mammon" Money is again Internet Explorer, which "slept" for the 5 years between releases between Internet Explorer 6 and 7. The "beast reborn" refers to Firefox, which gained supporters who self-organized through Spread Firefox, and undertook publicity for the browser, taking out an advertisement in The New York Times and making a crop circle shaped like the Firefox logo. The "cunning of foxes" is a direct reference to Firefoxs name. The "new world" refers to modern, standards-based dynamic websites and open source applications. The latter half of the passage links to the Mozilla Manifesto and the about:Mozilla newsletter. The last part, starting with "Mammon awoke" speaks of the release of Internet Explorer 7 and with "it was naught but a follower" describes it as a follower, copying several of the functions in Firefox that Internet Explorer previously lacked. Additionally, this quote from the "10th edition", is an allusion to the Mozilla Foundations 10th anniversary during the Firefox 3 development cycle.


6. The Book of Mozilla, 15:1

This verse landed in the Mozilla trunk codebase on January 23, 2013. It first appeared in the nightly builds of Firefox 21 Specifically, Firefox 21.0 Alpha 1 build 2013-01-23. Instead of a plain background, it now features a subtle radial gradient.

It is included in all Firefox versions since Firefox 21.0, all SeaMonkey versions since 2.18 Beta 1, and all Thunderbird versions since 21 Beta 1.

The "twins of Mammon" refers to Apple and Google, whose mobile operating systems, respectively iOS and Android, have taken a duopoly of the mobile OS market. The "new darkness" refers to the closed nature of traditional app stores. The beast moving "swiftly" refers to the new rapid release cycle of Firefox. The phrase "went forth and multiplied" refers to "Firefox becoming multiple things" through Firefox for Android and Firefox OS. The verse number 15:1 refers to the code freeze of Firefox OS 1.0 January 15, 2013.


7. The Book of Mozilla, 11:14

This verse first appeared in Firefox Nightly 58, landing in the Mozilla trunk codebase on September 22, 2017, and was later uplifted to show up in Firefox 57 Beta.

It refers to the major changes that culminated in the Firefox 57 release with the Quantum project. "Time and Space" refer to Quantum itself, while "Flow" refers to the Quantum Flow project, "new raiment" and "Light" refer to the UI refresh known as the Photon project. The Quantum Project contained the first major piece of code taken from Servo, the layout engine written in Rust, to which "oxidised metal" is a reference. The 11:14 chapter and verse notation refers to November 14, 2017, the day Firefox 57 was released.


8. Behavior in different browsers


In versions of SeaMonkey browser later than 2.0, about:mozilla displays the same Book of Mozilla verse from the Firefox trunk build that it was built off of.


8.1. Behavior in different browsers The Book of Mozilla, 11:1

Though not an official verse by Mozilla, a new verse of the Book of Mozilla, 11:1, became available in Flock Browser 1.0+, a "Social Web Browser" based on Firefox. This verse is shown on blue/white vertical gradient when about:mozilla is entered into the location bar. The verse is as follows.

"And when the beast had taken the quarter of the earth under its rule." is probably a reference to the 25% market share Firefox had gained over the more popular Internet Explorer. "Birds of Sulfur" references the developmental codename of Flock, which is Sulfur. The "mountain views" references the city of Mountain View, California where the company that produces Flock as well as Mozilla was based at the time of writing. The "24 wise men" refer to the 24 staff employees of Flock at that time. The "stars" refer to the star used in the branding "Flockstar". Though this verse was released 5 November 2007, much of the meaning is still unclear. "They took their pens and dared to create" is most likely a reference to the blogging and social networking integration in Flock. The section "Finally, they dared to share their deed with the whole of mankind." could possibly be making a reference to the fact that it is open source, and that they shared their good deed their creation of the browser with the world.


8.2. Behavior in different browsers Internet Explorer

In some versions of Internet Explorer, about:mozilla produces a blank blue page referencing the Blue Screen of Death.

The source markup of the page defines the text color as white. The page still can be seen even in Edge for Windows 10 when using the URL: res://mshtml.dll/about.moz. The about page was defined in a registry entry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\AboutURLs.


8.3. Behavior in different browsers Iceweasel

Due to a dispute with the Mozilla Corporation, the Debian project was forced to change the name and branding of Mozilla Firefox in its distribution. In response, it changed the name to Iceweasel and the icon to a white weasel-like variant of the Firefox logo. Iceweasel includes the about:mozilla Easter-egg and showed the standard page from the Firefox version it was built from. However, when users navigate to about:iceweasel they see a thematically similar message from the Book of Ice that describes the dispute with Mozilla and the creation of Iceweasel.

The "Corpse" in this edition represents the Mozilla Corporation and the references to the prohibition on "flying in my name" is a reference to the trademark prohibition.


8.4. Behavior in different browsers Netscape

Starting with Netscape 0.93beta and up to version 1.0, about:mozilla produced the text "Mozilla Rules!".

Viewing the about:mozilla page with a Unix version of Netscape would change the throbber to an animation of Mozilla rising up from behind the "planet" logo and breathing fire.


8.5. Behavior in different browsers Pale Moon

Prior to Pale Moon version 26, typing about:mozilla would show the 15:1 verse. However, in Pale Moon 26 and above it displayed the following:

Similarly to Iceweasel, Pale Moon has its own take on The Book of Mozilla, this time dubbed "The Chronicles of the Pale Moon", which can be viewed by navigating to about:palemoon, however, instead of the chapter and verse number referring to a date of significance in the browsers history, it refers to the version number the verse first appeared in, and instead of the subtle radial gradient being in the middle of the page, it is near the top right. In Pale Moon 24.2 to 27.0, the page title read "The Child of the Moon", and it showed the following text:

Since version 27.1 when Pale Moon became a true fork, the page title reads "The Dragons Roots", and the text reads:

The "ancestor" is believed to refer to Firefox, while the "bed of withered roots" is believed to refer to the Firefox ESR 24 codebase.

With the release of Pale Moon 28, the version number references were abandoned. The page title does not contain a title for the verse, and the text reads:

In this verse, the "old nest" is believed to refer to the old Mozilla XUL Platform used by prior versions, which had been abandoned in favour of a fork of Mozillas UXP under the hood, while retaining the older but customisable interface from Firefox versions 4 through 28.

With version 28.5.0, the pages text was once updated:

In this verse, landscape seems to refer to the current browser scene, tainted metal might be a reference to Rust, and the sanctuary being talked about here could be UXP, providing a common platform for XUL-based applications to build on.


8.6. Behavior in different browsers SeaMonkey

In versions of SeaMonkey browser later than 2.0, about:mozilla displays the same Book of Mozilla verse from the Firefox trunk build that it was built off of.