Mozilla has rolled out the Firefox 4 beta 2 for 64-bit Windows and this build is uploaded to ftp servers for download. So, the users who works with 64-bit Windows operating system can download the 64-bit Firefox 4 beta web browser compatible with their system.
The first Firefox 4 64-bit build was released few days back but that lacks MSVCR100.dll file which is a necessary Microsoft’s file to run the build. So, the testers who want to try Firefox 4 64-bit build 1 must have to download MSVCR100.dll separately so that problem is fixed in Firefox 4 64-bit beta 2 version.
Now, if you are using Windows 64-bit OS and want to test Firefox 4 beta 2 (64-bit) version then grab it from the following link.