Bookmarks changed after signing into Firefox account
I spend days cleaning out my bookmarks W10 HP laptop. then I saw the link on the top right to sign into my Firefox account..did not know I even had one. It had me verify with number sent to my email. I did not sync. When I signed out- my bookmarks were filled with old ones I had deleted and some duplicated, Why and how do I fix this from happening again other than never signing into this Firefox account again.