The latest official version of Firefox have windows x64 builds on the beta and dev &#x2F; aurora channels (and have for well over a year now): <a href="https:&#x2F;&#x2F;www.mozilla.org&#x2F;en-US&#x2F;firefox&#x2F;beta&#x2F;all&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.mozilla.org&#x2F;en-US&#x2F;firefox&#x2F;beta&#x2F;all&#x2F;</a>