I've just reset my Mozilla account password after having received multiple emails with authorization codes that failed. Prior to that, my password was rejected several times and I was asked for my 'one-time recovery key' (or something close to that). I couldn't find this, assuming I actually set one up, so proceeded and accepted that I may lose some bookmarks or other account-related items. Is there more information on what might be lost?

(For what it's worth, I've had this account for a long time. I've used it at work and home. I will retire in a few months and have been changing (or deleting) existing Firefox logins to a new non-work email address, using Thunderbird as a mail client. If there are any guidelines concerning an organized approach to doing this, please point me to them.)