It is the channel (http://www.mozilla.com/en-US/firefox/channel http://www.mozilla.com/en-US/firefox/channel) in between Nightly and Beta. Changes get pushed f

It is the channel (http://www.mozilla.com/en-US/firefox/channel http://www.mozilla.com/en-US/firefox/channel) in between Nightly and Beta. Changes get pushed from Nightly->Aurora->Beta->Firefox. I think I've seen it described as something of a "blessed nightly".