Usually not much happens to a software product from one point release to the next, much less one beta version to the next. But Mozilla has made quite a few changes with the second beta of Firefox 3.1, released Monday.
In the new version are support for video and audio built into Web pages, a built-in service for telling Web sites a user's location if users permit it, private browsing, Web worker support for more powerful Web-based programs, and my favorite feature, the TraceMonkey engine for running the JavaScript programs used to build sophisticated Web sites. TraceMonkey was released before, but now it's switched on by default.
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