There was never a 64-bit version of Firefox. There were 64-bit Nightly builds, which aren't even branded as Firefox. Running them because you wanted a 64-bit ve

There was never a 64-bit version of Firefox. There were 64-bit Nightly builds, which aren't even branded as Firefox. Running them because you wanted a 64-bit version of Firefox would have been a silly thing to do, because, as unreleased software, they also crash significantly more frequently than released Firefox versions, which almost certainly would have killed any productivity increase from running a 64-bit version of Firefox.