Mozilla are planning to release 6.0 to the web later today, just 2 months after Firefox 5.0 made it's way out of beta and a month after 5.0.1 was released in July.
Mozilla introduced a beta and development channel (much like that of Google Chrome) called Beta and Aurora respectively after Firefox 4.0 shipped, which has sped up their release cycle dramatically; they also have a "Nightly" channel which are development versions made available to testers without the quality assurance testing the other two channels do get.
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