Hi, we would not know why those things happened as each users system is configured so differently that any thing can happen and does as it is, after all a computer program. Please check your Desktop for a folder called OldFirefoxProfile if it is there it is possible to maybe recover data from it as it was deemed corrupted in the update. Let us know please. Please check here to see if there is a 2nd profile, your looking for the oldest dated folder. *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data As for Parental Controls you will need to be more specific and expand on that as we have no idea what you did, what your running, what modifications you have made. So please inform us to the fullest detail. Thank You.