Mozilla has taken another step toward delivering a “Metro” version of Firefox to Windows 8 users.

Late Tuesday, Asa Dotzler, the Firefox desktop product manager, announced that a preliminary Metro browser had reached “mozilla-central,” the source code repository that feeds into what Mozilla calls the “Nightly” build channel.

Nightly builds are designed for testing, and as the name implies, are automatically updated each night to that day’s edition. Firefox’s Nightly builds are Mozilla’s roughest-edged editions. Every six weeks, the current Nightly morphs into an Aurora build — analogous to an alpha — that kicks off a three-month development cycle which ends when the next iteration is officially released.

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