was one of several readers to point out the release of Firefox 3.1 Beta
2, the first version of its flagship browser to switch on the much
faster TraceMonkey JavaScript engine and sport a working privacy mode
dubbed “Private Browsing.” An ancillary addition to Private Browsing is
a new addition to the “Clear Recent History” dialog box allowing users
selectively to erase the last hour, the last two hours, the last four
hours, today’s, or all browsing history — previously, the wipe was all
or nothing. This beta includes support for “web worker threads,” a
developing specification that will let Web-based application developers
run background processes to speed up their apps. One feature present in
Beta 1 is gone in the new beta: Ctrl-Tab switching. According to the
developer, the UI needs more work; the feature probably won’t be in the
final 3.1.

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