Since Firefox x64 version 42 is now released (available through FTP only) - Should I switch to x64 or stay on x86? I only use Adblock Plus add-on. Further is it possible to have both x64 and x86 versions installed side by side having common profile? I am using Windows 10 Pro x64 and Windows 8.1 pro x64. Please advice - is it the right time to switch?