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Is there a 64 bit version of Firefox?


Is there a 64 bit version of Firefox? I downloaded what I thought was a 64 bit version, it looks and acts the same as Firefox but is called Nightly. Is this the 64 bit version of Firefox?

Modified by bubba070

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.1 r102
  • McAfee MSC FF plugin DLL
  • Office Authorization plug-in for NPAPI browsers


  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:13.0) Gecko/20120227 Firefox/13.0a1

More Information

Matt Brubeck 147 solutions 1390 answers

Helpful Reply

Yes, you are using a Nightly build (a pre-release development snapshot) of a future version version of Firefox. 64-bit Windows builds are meant for testing only. The 64-bit Windows builds are not officially supported and in many respects are slower than the 32-bit version. We recommend using the 32-bit version because it is better-optimized, better-tested, and more supported.

For technical details, see the following links:



Modified by Matt Brubeck

M 1 solutions 4 answers

Helpful Reply

Waterfox is 64 bit firefox