Firefox 32 and later builds store the passwords in the logins.json file in the profile folder and no longer use the signons.sqlite file that has been used before (the matching key3.db file is still needed). If you still have the signons.sqlite file used in previous Firefox versions then you can try to force Firefox to migrate the passwords saved in that file (you will lose passwords saved in Firefox 32+ versions). You can force Firefox to reimport the passwords from the signons.sqlite file and rebuild the logins.json file with these steps:

• reset the signon.importedFromSqlite pref on the about:config page to the default value via the right-click context menu
• delete the logins.json file in the Firefox profile folder with Firefox closed

When you restart Firefox then you should have the signon.importedFromSqlite pref with the value set to true and you should have the passwords imported in the Password Manager unless there may have been errors. If that didn't help then remove or rename the logins.json and the signons.sqlite and possibly the key3.db files to force Firefox to create new files. You need to set a new Master Password after deleting the key3.db file.

Tried everything you suggested and still no luck. Passwords still aren't saving. Whenever I enter a username/password on any site I use no "save this password" box pops up, and none is saved on the "saved passwords" box under Security. Should I just uninstall/reinstall Firefox and only try to copy/paste my bookmarks? Perhaps there are some other old files preventing the save box from appearing? Is it possibly a hardware problem?

What files did you copy from the other computer?

Did you delete the logins.json and signons.sqlite an key3.db files?

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I got it working. I reinstalled Firefox, imported Bookmarks only, and manually input the passwords and it worked fine, so apparently some file I had copied/pasted was causing the problem. Previously I had just copied my entire Firefox Profile. Not a good idea, I guess.

'Remember password' prompt is not displayed at all and no password is saved. What can I fix?

This has happened after copying some archives from my old Mozilla profile to the Mozilla profile.