Yes, you are using a [http://nightly.mozilla.org/ 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: https://groups.google.com/forum/#!topic/mozilla.dev.planning/Mrba6hvl5-w https://groups.google.com/forum/#!topic/mozilla.dev.planning/Giij-AZfUAM

Waterfox is 64 bit firefox