Firefox for Windows 64-bit - Mozilla
www.mozilla.org › en-US › firefoxIf you’re running 64-bit Windows ( here’s how to check ), your Firefox may already be 64-bit. Check your Firefox version (in the “About Firefox” window) and look for “ (32-bit)” or “ (64-bit)” after the version number: If you see “ (32-bit)” and you are running Firefox 56.0 or older, updating to the latest Firefox version ...