Mozilla late on Friday released the first beta of Firefox 3.6, a minor upgrade slated to wrap up later this year.
Among the new features visible to users is integrated support for the scaled-down browser skins dubbed "Personas" by Mozilla, and new warnings to users when they reach a site that calls on outdated plug-ins, such as Adobe's Flash Player or Apple's QuickTime.
The warning is only the last of several moves Mozilla's made in the last two months to reduce the number of users who are vulnerable to attack because they haven't updated third-party plug-ins. In early September, Mozilla debuted plug-in checking with updates to Firefox 3.5.3 and Firefox 3.0.14, which automatically detect outdated versions of Adobe's Flash Player and prompt users to upgrade to the newest -- and theoretically the most secure -- edition.
Since then, Mozilla has added a page on its site where users could manually check other plug-ins for obsolete editions. Firefox 3.6 Beta, however, displays a warning when the browser is asked to call up an outdated plug-in. "Some plug-ins used by this page are out of date," the message reads.
Some features once destined for Firefox 3.6, however, have been dropped, including one that was to take advantage of Microsoft's new Windows 7. Integration with Windows 7's Jump Lists -- a feature that would list recently-visited sites when Firefox's icon is right-clicked in the taskbar -- has been postponed and wasn't included with the beta.
Support for Windows 7's Aero Peek and taskbar thumbnail previews did make it into Firefox 3.6 Beta, even though Mozilla had some last-minute work nailing down the former.
All versions of the browser now offer thumbnail previews when users cycle through the open tabs with the Ctrl-Tab key combination. The feature is disabled by default in the beta, however. To switch it on, users must edit Firefox's configuration file by entering "about:config" in the address bar, locating the "browser.ctrlTab.previews" item and double-clicking it to change its setting to "true." Firefox must be restarted for the change to take effect.
Mozilla also warned testers that many add-ons, the small extensions that many Firefox users find its most compelling feature, are not yet compatible with the beta. To force an add-on to work with the beta, and at the same time report the incompatibility to Mozilla, Beltzner urged users to download and install the Add-on Compatibility Reporter. In Computerworld's tests, the reporter successfully allowed scores of incompatible add-ons to run in the beta of Firefox 3.6.
Mozilla has also posted an extensive description of the changes to Firefox of interest to Web site and application developers.
The company is still hammering out how it will offer users Firefox 3.6 when it ships in final form. Some, including Beltzner, lean toward a security update-like mechanism, while others have argued for something more explicit, akin to the "major upgrade" invitations that Mozilla presents users of older editions from time to time.
Although Firefox 3.6's interface chances are minor, Mozilla plans to revamp the user interface in Firefox 3.7, set to launch in the first half of 2010, and finish the redesign in Firefox 4.0, currently scheduled for late next year.
Users already running one of the earlier builds of the beta will be upgraded automatically to the version released Friday. Others can download Firefox 3.6 Beta for Windows, Mac OS X and Linux in 46 different language editions from Mozilla's site.
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