Previous schedules published by Mozilla had limited Firefox 3.1 to only two betas before moving to a release candidate.
In a long post to the "mozilla.dev.planning" forum, Mike Beltzner, the director of Firefox, said that Beta 3 is necessary to get a feel for the severity of the remaining bugs and an idea of how long it will take developers to eradicate them. In addition, another beta will give more exposure to features landing in the browser only as of Beta 2, which has not yet been released.
Beltzner named several of Firefox 3.1's high-profile additions, including the new "TraceMonkey" JavaScript rendering engine and the so-called porn mode feature, dubbed "Private Browsing Mode" by Mozilla, among those that would benefit from more testing.
Beta 3 is not a done deal, Beltzner noted in a follow-up e-mail to Computerworld today, but he is confident that developers would approve the plan. "We're never comfortable declaring new milestones by fiat, but I expect that there won't be any opposition to the plans for a third beta at today's meeting," he said. "I'd say that it's very likely at this point."
So far, Mozilla has shipped only Beta 1, which was released six weeks ago, although Beta 2 should be available in early December, perhaps as soon as the end of next week. A schedule for the third beta has not been set, but Beltzner said Mozilla would likely declare a "code freeze" -- a milestone after which changes are either forbidden outright or tightly restricted -- in early January.
In his e-mail today, Beltzner stressed that the extra beta wouldn't delay the final version of Firefox 3.1. "We believe we can do this without major impact to our shipping schedule," he said. "It's more a matter of inserting another public consultation milestone than it is about slipping, per se."
Mozilla is traditionally leery of committing to final ship dates -- like other developers it typically says it launches products when they're ready and not on a timetable -- but previously it had said it was shooting for a late 2008 or early 2009 window. Today, however, Beltzner said that Firefox 3.1 is "still looking at late in Q1 2009 for final delivery."
In a status meeting last week, Mozilla also decided to retract a revamped Ctrl-Tab tab-switching feature it had originally slated for Firefox 3.1. The enhancement, which was based on an already-available Firefox add-on, showed users thumbnails when they cycled through open tabs, and switched between current and last-viewed tabs rather than simply moving to the next tab to the right. Like many of the features that made it into Firefox 3.1, it was initially set for Firefox 3.0, but had slipped out of that earlier update.
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