Firefox 4 Beta 2 has now available for download for Windows, Mac and Linux operating systems. If you want to download Firefox 4 Beta 2 in another language, you can grab it by visiting the Firefox localized version page. Here you’ll find the browser offered in 24 languages.
Download Firefox 4 Beta 2
Firefox 4 Beta 2 Release Notes
If you want to download the portable version instead of the installer, you can grab it at the PortableApps site.