Keep it simple with sync. see screenshots https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox I run multiple versions of Firefox on all my devices as you can see in the screenshot. It's a good idea to have your data on more than one device and also in more than one version of Firefox in case the browser goes BOOM!. There are several users asking how to get data back because an update blew away all their data.