I have problem with launching 64-bit version of 55.0.3 on Win 10 x64.
When I launch fresh install of Firefox Portable then in Process Explorer there is 32-bit "Firefox Portable" launcher process and 64-bit "Firefox" processes.
But when I move my profile in to this installation then launcher always runs 32-bit version.
How to run 64-bit Firefox with existing profile?
(AlwaysUse32Bit is set to false)