Mozilla has opened up the beta for Firefox 4. Part of the new additions include a brand new interface, with tabs on top by default and hiding the menubar inside a new Firefox button.

Firefox 4 Beta has crash protection, such as closing a plugin if it crashes rather than the entire browser. Other features include improved HTML5 support, full WebGL support for 3D rendering and support for Google’s WebM video format. Download the beta for yourself at mozilla.com.