What Is Firefox (O'ReillyNet)
Firefox 1.0 was released in November 2004. Since then, there have been supplementary releases, mainly to address security and stability issues. The current official release is 1.0.7. In the meantime, however, work has been continuing on the next major release. That release was to be 1.1, but because of all the new features added, it was deemed worthy to be bumped up to a 1.5 version. Firefox 1.5 Beta 1 was released on September 8, 2005, and Firefox 1.5 final is due in November after further beta releases."