Report of a user on reddit: https://www.reddit.com/r/firefox/comments/bx0y4v/firefox_updated_and_deleted_all_my_addons_and/ User says they used auto-update to update to the newest release. My guess is that they were using 67. Once they received the update, their installation directory changed from :\Program Files (x86) to C:\Program Files This then triggered the behavior in bug 1474285, so it looked like their data was lost.
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Report of a user on reddit: https://www.reddit.com/r/firefox/comments/bx0y4v/firefox_updated_and_deleted_all_my_addons_and/ User says they used auto-update to update to the newest release. My guess is that they were using 67. Once they received the update, their installation directory changed from :\Program Files (x86) to C:\Program Files They claim that they now have two Firefox installation directories. This then triggered the behavior in bug 1474285, so it looked like their data was lost.