Hi, Mozilla Firefox new version Firefox 4.0 and Beta 1.If you want to test Add-Ons with Firefox 4 Beta, you will need to install the Add-On Compatibility Reporter first.The download package contains Mozilla Firefox 4.0 Download Beta 1.(web browser)
OS: Windows All
Firefox 4.0 Beta 1 Download for Windows (7.1MB)
OS: Mac OS X
Firefox 4.0 Beta 1 Download for Mac (20.2MB)
OS: Linux