Mozilla released their first beta version Firefox 4. Mozilla plans to issue new beta versions every two or three weeks in order to modify the browser in response to beta users’ comments.
There is a new add-on manager to support Google’s WebM for compressed video content. Firefox 4 beta 1 has improved responsiveness at start-up and during page loads. Other feature is Jetpack software development kit (SDK) for authors to create add-ons. It does not require users to restart their browser to install.
Other features include webSockets to build realtime online interactions (gaming and chat apps), support for Cascading Style Sheet 3 (CSS 3) and Web console.
To download Firefox 4 is here.