Download Firefox 64-bit for Windows 64-bit
Since the official Mozilla site only provides Firefox 32-bit and none of the pages states any information about the 64-bit version, many users do not know that Firefox 64-bit does actually exist. They plan to provide the 64-bit edition together with Firefox 4, but it’s still long the way to go. If you don’t want to wait that long, you can download Firefox 64-bit right now.
“Firefox Windows x64 build doesn’t work on 32bit Windows even if you use processor that supports Intel EM64T or AMD64″
Firefox 64-bit is available for download for Firefox 3.0, Firefox 3.6 and Firefox 3.7 pre-builds. However, before you download it, note that Firefox 64-bit only supports 64-bit plugin. There is no prominent advantage of using this 64-bit edition over the 32-bit so far, but if you insist on using this version you can download it from this site.Lijit Search