Mozilla has announced that there will be at least 2 Beta releases for the upcoming Firefox 3.1 release. We’re still hammering out the details, but we know that there is a core list of features that we’ll be looking to land between beta 1 and beta 2, likely: extending TraceMonkey’s capabilities into the DOM and other parts of our system completing private browsing a bunch of UI cleanups and improvements building on FF3’s success, and incorporating things we’ve learned from other browsers and add-ons some core improvements to systems like PFS [Plugin Finder System] and our security UI As of…