Naming

The project which became Firefox started as an experimental branch of the Mozilla Suite called m/b (or mozilla/browser). When sufficiently developed, binaries for public testing appeared in September 2002 under the name Phoenix.

The Phoenix name was retained until April 14, 2003 when it was changed (after a short stint as Phoenix Browser) due to trademark issues with the BIOS manufacturer, Phoenix Technologies (who produce a BIOS-based browser called Phoenix FirstWare Connect). The new name, Firebird, was met with mixed reactions, particularly as the Firebird database server already carried the name. In late April, following an apparent name change to Firebird browser for a few hours, the Mozilla Foundation issued an official statement which stated that the browser should be referred to as Mozilla Firebird (as opposed to just Firebird). Continuing pressure from the Firebird community forced another change, and on February 9, 2004 the project was renamed Mozilla Firefox (or Firefox for short).

The name, "Firefox", was chosen for its similarity to "Firebird", but also for its uniqueness in the computing industry. To ensure that no further name changes would be necessary, the Mozilla Foundation began the process of registering Firefox as a trademark with the United States Patent and Trademark Office in December 2003. This trademark process led to a delay of several months in the release of Firefox 0.8 when the foundation discovered that in the UK Firefox had already been registered as a trademark for browsers by The Charlton Company. The situation was resolved when the foundation was given a license to use Charlton's European trademark.

The repeated renaming of the program prompted the development of the tongue-in-cheek extension "Firesomething", which allowed users to randomize the name on startup, giving it such satirical soubriquets as "Firegiraffe" or "Moonbadger"