Mozilla Firefox announced on its blog that 64-bit support for Firefox is finally available for Windows platforms. As long as your computer is running in Windows 7 or above, you should get improved security and speed for your Firefox browser.
Firefox 64-bit, by design, has limited support for plugins, and certain websites requiring plugins that worked in Firefox 32-bit may not work for the 64-bit version. However, this is all part of the plan as Mozilla plans to remove support for most NPAPI plugins in the browser by the end of 2016.
Aside from the 64-bit support, Firefox also received a new blocklist for its Private Browsing system. The list is on by default and it basically blocks any ads, analytics or social trackers. There is also an option to choose a ‘strict’ version of the blocklist, enabling it to shield against additional content trackers.
The Firefox 64-bit is now available for download in this page.