The Firefox web browser is spotted different logos from both the nightly builds and Aurora channels. As talking about the change Firefox has now two versions in the development Firefox 5 and Firefox 6, been released in different early access release channels. Firefox 5 is now been released in Aurora channel, while Firefox 6 in nightly builds channel.
Mozilla has decided it will pursue simultaneous development of more and three different versions of web browsers .
This means that if Firefox is now the stable version 4, are already working in Firefox 5 and 6.
When will Firefox stable 5, 7 will immediately begin to develop Firefox and so on.
This method of work is being carried out by the Google browser Chrome which you can download the beta of the next version, or better yet, install Chrome Canary who is always one version ahead of the stable and the installation of which is independent of the Chrome Standard.
How to Download Firefox 5 from Aurora Channel and Firefox 6 from Nightly Builds
Mozilla Firefox 5 (Aurora): http://www.mozilla.com/firefox/channel/ (only Windows builds are listed)
Mozilla Firefox 6 is currently the only version which has an official 64-bit (x64) version available for Windows platform. If you install the nightly built Firefox 6, you may want to upgrade to new build every day.
Mozilla plans to release a new major version of Firefox at every six to sixteen week intervals, which scheduled final release of Firefox currently sets on June 21, 2011 and Firefox 6 on August 18, 2011. In fact, Firefox 7 may also also been shipped by the close of 2011, with early builds available as soon as Firefox 5 is shipped.