Late to the x64 Browser Party

[hh5]

Apple's Safari has been 64-bit on OS X -- its only supported platform at this point -- since 2009's version 4, which launched alongside OS X Snow Leopard. Microsoft's Internet Explorer has been available in 64-bit since 2006's IE7, while Opera Software, the Norwegian browser maker known for its same-named desktop flagship, also offers a 64-bit edition on Windows.

 

But Google and Mozilla have been slower to adopt 64-bit. Google currently offers a 64-bit browser for Linux, and is working on one for OS X. The latter is only available in Chromium, the pre-Canary build, and has been marked as experimental. It requires OS X Mountain Lion or later.

 

chrome x64 devchannel

 

Mozilla doesn't have a release version of Firefox 64-bit for Windows operating systems. Mozilla does have Nightly alpha-level 64-bit versions for Windows, but currently they are generated to only verify that Nightly channel changes aren't being broken on 64-bit versions of Windows.

 

There are a few 3rd party 64-builds available, like Waterfox, but those aren't official Mozilla releases.