Firefox for Windows 8's 'Modern' or 'Metro' UI fills the screen and puts tabs up top in thumbnails.
Bondy had made the case earlier that it was important for Mozilla to craft a Modern Firefox app because of the default-browser issue. "Even if a user spends most of their time in the desktop [UI], having a really good [Modern] browser may be enough for the user to change their default," Bondy argued in April.
It's unclear when Mozilla will wrap up work on the Modern app. Although the preview is pegged as Firefox 18, it's actually a spin-off of the normal Nightly channel, and so it does not yet have a definitive timetable.
Firefox 18 reaches the Aurora channel -- analogous to an "alpha" build -- next week, and will shift to Beta in late November before launching Jan. 9, 2013. It seems unlikely the Modern app will be ready soon, certainly not in time to be added to the Aurora channel for Firefox 18.
Previously, Dotzler said that he didn't believe a Firefox app for Windows 8 would be further along than a "late-stage Beta" this year.
Microsoft will launch Windows 8 on Oct. 25 during a several-hour event, and start selling the upgrade the next day. Also on Oct. 26, PC makers will begin selling systems pre-loaded with Windows 8.
Windows RT, the touch-only spin-off of Windows 8 designed for tablets, is an entirely different story, however, and complicates Mozilla's work. Unlike Windows 8, Windows RT bars all third-party developers from accessing the limited "desktop" mode; only Microsoft's programmers can call the APIs there, which they do to power much of the Modern version of IE10 on the tablet OS.
Mozilla howled, and in May accused Microsoft of anticompetitive behavior by purposefully blocking others from building browsers that could effectively compete with IE10.
In June, Google launched a preliminary version of Chrome for the Windows 8 Modern environment, but that app is less a reworking of its sibling than a minimalist effort that discards Microsoft's design guidelines.
Google has not set a launch date for its Modern-style browser, but looks likely to debut it alongside Chrome 23, which would ship sometime next month.
The Modern-enabled preview of Firefox 18 can be downloaded from a Mozilla server ( FTP download), but caveats abound: Users must be running Windows 8 RTM, and must set the browser as the operating system's default by following several steps outlined by Bondy in his blog.
The next non-Modern edition of Firefox, version 16, will launch Tuesday, Oct. 9.
Sign up for Computerworld eNewsletters.