Mozilla Corp. will probably add a third beta to the development schedule for Firefox 3.1 to get a better handle on remaining bugs and give several new features, including a faster JavaScript engine and a private browsing mode, more testing time, the company's browser director said today.

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.

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