Mozilla last week confirmed it will add another beta to the Firefox 3 .1 development schedule, a move that will push the browser's ship date to the second quarter or later.

"We're going to wrap up Beta 3 in the next week regardless of 'upvar' status," said Mike Shaver, Mozilla's vice president of engineering, referring to a particularly troublesome bug in Firefox 3.1's new JavaScript engine that has held up releasing that preview.

"A fourth beta will follow approximately six weeks after, as a vehicle for more testing of [the] TraceMonkey [JavaScript engine], video, Places and other eagerly-awaited improvements, as well as feedback from Beta 3," Shaver said in a message on a company forum .

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