If you're running a 64-bit version of Windows 7 or higher there's finally a version of Firefox designed to take advantage of your system.
Mozilla has finally introduced a 64-bit version of Firefox for Windows with the recent release of Firefox 43.
Firefox 64-bit for Windows, by design, has limited support for plugins and users will notice that certain sites requiring plugins that worked in previous 32-bit versions of Firefox might not work in this 64-bit version
Firefox 64-bit for Windows Available | Future Releases
Mozilla has finally introduced a 64-bit version of Firefox for Windows with the recent release of Firefox 43.
Firefox 64-bit for Windows, by design, has limited support for plugins and users will notice that certain sites requiring plugins that worked in previous 32-bit versions of Firefox might not work in this 64-bit version
Firefox 64-bit for Windows Available | Future Releases