I can't get firefox to automatically fill in my sites.

Hello, FIrst, go to about:support, then find your profile folder and click open folder. After that, close Firefox. After that, look for a file named logins.json.corrupt. If so, rename it to '''logins.json'''. Alternatively, you can look for a logins-backup.json file, and if you do, rename it to '''logins.json''', and look for a key4.db backup version too, and rename to '''key4.db'''. After that, restart firefox.