Mozilla released its fourth beta of Firefox 4 on Tuesday, bringing a new feature that addresses one of the biggest challenges in the new era of the browser: reclaiming control over the burgeoning number of tasks that now happen on the Web.

Available for Windows, Mac, and Linux, Firefox 4 beta 4 introduces a feature now called Firefox Panorama. Today's browsers typically cram tabs in a strip along the top of the window, but Panorama provides a Mac OS X Expose-like interface that groups tabs into related bunches.

Panorama presents an array of thumbnail images, each representing a tab. The thumbnails reside in rectangular boxes that constitute a group. Tabs can be moved from one group to another, and groups can be named and moved as well.

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