One of the major and essential components for the future implementation of Firefox just became available through beta. It gives the browser the page-rendering speed power boost that it had been lacking.
New Font control is available. Firefox 4 now supports the OpenType font format. This means that designers can control ligatures, kerning, cap variants, and alternative characters. There is also graphics rendering. Developers will be able to support 3D graphics rendering using WebGL. Running it requires an OpenGL-enabled graphics card. But support for other cards is in the planning stage.