Mozilla released the Firefox 4 open source browser's the public beta version on Wednesday. The new release comes several days after Mozilla released the first pre-release code for Firefox 4
, and the updated version brings a number of changes designed to enhance the browser's usability and security.

The obvious change is the browser's look. Like Chrome and Opera, tabs are now located at the top of the browser (Windows only), and a new add-on manager is included to make it easier to find plugins.

Under the hood, Firefox 4 beta 1 heightens security, offers crash protection, supports technologies that are vying to become new Web standards (HTML5 and WebM), and contains
other bells and whistles.

The download is available on the Mozilla Web site.