We sent out a MacBook Pro 15-inch 2017 to Apple for a battery replacement. They also replaced the logic board, which means a blank/fresh boot drive. After restoring from Time Machine, Firefox makes a new profile at launch, instead of referencing the original “working” profile, even though it's the default. It creates profiles as n9w2dcnd.default-release-#; for example: n9w2dcnd.default-release-1, n9w2dcnd.default-release-2, and so on. It works one time after we set the correct profile to default, but not after subsequent relaunches of Firefox. Basically, we went into about:profiles, set the correct profile as the default, delete other profiles, restarted Firefox, everything in Firefox was as it was before Apple wiped the computer. However, if you quit and reopen Firefox, it generates that new profile (like I stated above), and appends a number after it. Even starting up Firefox with a default profiles will simply cause Firefox to make new profiles after each relaunch. We got up to 6 profiles just testing it, before stopping and coming here. Some notable information: - We were running 10.15.7 before, Apple wiped it and installed 10.12.6, but upgraded to macOS 12.0.1, as 10.15.7 and 11.x are no longer available. - All permissions seem correct on the profile folder inside the user Library, including /Users/rick/Library/Application Support/Firefox, and /Users/rick/Library/Application Support itself. I even set the “everyone” or read and write. - We have the current version of Firefox installed. - The previous version installed is whatever was current or near current on Thursday when we ran the last Time Machine backup. I'd really appreciate any help. Thanks!