The 32 bit version should be fine and is what most Windows users use. The 64bit version is not quite as flexible when it comes to using plugins, it is limited to FlashPlayer & Silverlight. For a while it has still been thought of as experimental on Windows, although we Linux users have had the 64 bit version for years as have Mac users. The big advantage is if you have a lot of RAM maybe 8 or 16GB Firefox may be able to make use of that. Both versions are available for download from * https://www.mozilla.org/firefox/all/ I believe Mozilla has plans soon to offer the 64bit version by default where applicable to Windows users, See also * [[How to switch from 32-bit to 64-bit Firefox]] * [[How do I tell if I have the 32-bit or 64-bit Firefox?]] * '''Firefox 64-bit for Windows can take advantage of more memory https://blog.mozilla.org/nnethercote/2016/07/22/firefox-64-bit-for-windows-can-take-advantage-of-more-memory/'''