Firefox 4 Beta 1 adds an improved Add-Ons Manager, WebM and HD Video support and fixes for flaws in some Web standards that tighten up security. This beta also provides WebSockets, which allows developers to build real-time online interactions; Stylin’ Pages with support for new CSS3 features; HTML5 support, including a new HTML5 parser; and a Web Console that provides analysis tool for modern sites. With Firefox 4 add-ons can be installed without restarting the browser, and can be developed more easily using the new JetPack SDK and js-ctypes. The Indexed DB allows developers to store application data locally, making cloud applications work more quickly and reliably, even when not connected to a network. In addition, Firefox provides uninterrupted browsing for Windows, Linux and now Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.

New Add-Ons Manager

An easier way to manage your add-ons and discover new options for personalizing your browsing.

WebM and HD Video

As pioneers of HTML5 video standards, Firefox also supports the WebM format so you can watch open HD quality video.

Protecting Your Privacy

Firefox puts your privacy first, fixing flaws in some web standards that allow bad guys to snoop around and expose your browser history.