I-Firefox Isithangami Sokwesekwa

Hi I am currently using Firefox on my laptop. Last month my system crash.I was still able to use my system but it was on save mode. I took system to my engineer and he said he is going to work on it. I did not know that he is going to format my system I will have told him not to because virtually all the password to my acct is being saved on my Mozilla Firefox browser. He has formated my system although he reinstall another Mozilla browser on my system. Please what can I do to get back all my saved password. Please it urgent.

When I turned on two-factor authentication, I was presented with some recovery codes which I downloaded to a secure folder. Later, I tried to use one code. The codes downloaded as lower-case letters but the form for using them converted every letter to uppercase and the codes I had just downloaded were rejected.