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Re:Firefox 4: 100 million downloads in 1 month by code_duck on Saturday April 23, 2011 @12:09AM (#2476239)
Wait, what's 'Aurora'? I'm using Nightly, which is the new name for Minefield. It's sporting a spiffy new logo which looks a lot like the Aurora logo.
Re:Firefox 4: 100 million downloads in 1 month by starwed on Saturday April 23, 2011 @02:22AM (#2476377)
It is the 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".