Had 64-bit Firefox for ages...
Linux has had official 64-bit Firefox for ages and even Windows users have had both official (nightly) and unofficial (Palemoon/Waterfox) 64-bit builds too, so 64-bit isn't big news for those who really wanted it on Windows.
One minor relief on the Linux side is that they've postponed the move from GTK+2 to GTK+3 until maybe version 45 in March next year - at which point it would break on at least one prominent LTS distro (CentOS 6) that's got support until Nov 2020.
Biting the hand that feeds IT
