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Mozilla FireFox 67+
What profile changes were made in Firefox 67?
Some users have multiple installations of Firefox, each in separate program folders. These separate Firefox installations previously shared a single profile by default. Starting with Firefox version 67, Firefox uses a dedicated profile for each installation of Firefox (including Nightly, Beta, Developer Edition, and ESR installations). This makes Firefox more stable when switching between installations on the same computer and also allows you to run different Firefox installations at the same time.
With these changes the package process for firefox needs one little tweak to allow for the playback of app and acceptance of an already existing profile.
after capture select the edit package option.
Delete this item from the Firefox package and then save. this should allow your profiles to move from any 67+ build to any future build without rejecting the profile and trying to start a new one.
Note if you are using a 32 bit version of firefox the regkey is
Here is a little more detail on how to flip back to legacy profiles.