It looks like Mozilla finally came out with Firefox 64 bit browser, have a look at the links below
Firefox 64-bit for Windows Available | Future ReleasesCode:https://www.mozilla.org/en-US/firefox/all/
Been there in the past,but is it worth it Mozilla Firefox 40.0 + Windows 10
I'm looking at it now for the first time and I can't see where it shows 64, or if it even does?
As per your link
lol ... No, I meant while using it. I don't see anywhere it shows it's 64, it would be hard to tell which is which between the 2 ( 32 / 64 )
Downloaded it from the usual place you probably have 32bit version. Copy and past this into address bar, if see 32 then you will know.
about:buildconfig
Build platform
target i686-pc-mingw32
32 bit version then
Latest Firefox Released for Windows
Thanks jds63 & Brink
Welcome !!