An anonymous reader tips news that, right on schedule after Tuesday's Firefox 8.0 launch, Mozilla has rolled out the beta of Firefox 9.0. This update brings a significant boost to JavaScript performance, UI improvements for the OS X Lion version, and Do Not Track opt-out detection for developers. 9.0 beta also "supports chunking for XHR requests so websites can receive data that’s part of a large XHR download in progress. This helps developers make websites and Web apps faster, especially those that download large sets of data or via AJAX."
http://news.slashdot.org/story/11/11...beta-available
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