Restore Firefox & Thunderbird user data from Time Machine I have a fresh installation to which I want to transfer my Firefox and Thunderbird user data. I have my Time Machine backup available from Other backup disk and could in principle restore the hidden Library folder. However, I don't want to migrate everything from my old Library to the fresh install.

Which Firefox and Thunderbird user data folders do I have to migrate to my fresh installation?
The User Data folders for Firefox and Thunderbird are:

/Users/$USER/Library/Application Support/Firefox
/Users/$USER/Library/Thunderbird


You might also want to migrate the .plist files for them as well:

/Users/$USER/Library/Preferences/org.mozilla.firefox.plist
/Users/$USER/Library/Preferences/org.mozilla.thunderbird.plist


Make sure the applications are close before migrating the folders/files.