Mozilla launches Firefox 3.1 Beta 2, now with 'Private Browsing'
Company switches on speedy TraceMonkey engine, adds privacy mode
Private Browsing is a reaction to similar additions in other browsers, including Apple's Safari, Google's Chrome and Microsoft's Internet Explorer 8. Privacy mode lets users surf without leaving obvious traces of where they've been, which has led to the feature being dubbed "porn mode" in a nod to one of its more obvious uses.
An ancillary change to Private Browsing is a new addition to the "Clear Recent History" dialog box that allows users to selectively 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.
Firefox 3.1 Beta 2 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 trumpeted by Mozilla in Beta 1 has disappeared in the newest version. As Mozilla noted in late November, it pulled a revamped Ctrl-Tab tab-switching feature because it wasn't satisfied with the tool's user interface. The now-absent Ctrl-Tab redesign, which was based on an existing add-on of the same name, showed users thumbnails when they cycled through open tabs, and switched between current and last-viewed tabs rather than simply moving to the next tab on the right.
According to Web metrics company Net Applications Inc., Firefox accounted for 20.8% of all browsers used during November, marking the first time that the open-source browser broke the 20% barrier for an entire month.
Few users are trying Firefox 3.1, however; last month, only 0.05% of all users were running a preview of the new version, Net Applications said.
There will be at least one more beta in the Firefox 3.1 development cycle. Two weeks ago, Mozilla said it had added a third beta to the process, in part to evaluate some of the features introduced today, including TraceMonkey and Private Browsing, and to allow time for programmers to fix the bugs that users report.
Firefox 3.1 Beta 2 can be downloaded for Windows, Mac OS X and Linux from Mozilla's site. Users already running Beta 1 will be notified of the available update in the next 48 hours.
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