

Empty versions of those files will be automatically created. If that doesn't help try exiting Thunderbird, deleting the logins.json, key4.db and cert9.db files in the profile, and restarting Thunderbird. Instead of editing prefs.js, you can change the same setting using Tools -> Options -> Advanced -> General -> Config Editor (Thunderbird's equivalent of about:config) On the next startup of Thunderbird you should find the checkbox for remembering the password in the password manager.Close the Notepad or editor window and save changes.

Find the following line: user_pref("signon.rememberSignons", false).Close Thunderbird and open the prefs.js file in Notepad or another editor (make a backup copy of prefs.js first, as a precaution).To change this, you will need to edit the prefs.js file, located in the Thunderbird profile folder. It can happen that you will find no checkbox in Thunderbird to remember passwords. This is not too bad because it is usually only once a week or so that you need to post. One work-around is to unsubscribe to that folder, and use web-access to post to that folder. If one of your subscribed groups is write-only, as is normal for university assignment folders (for on-line students), the error that the server generates will prevent Thunderbird from EVER remembering your username or your password. Note that you will get an unrelated error (such as timeout or server unreachable) if you do this, and someday they will change the server address. Several people have reported working around this problem with the Yahoo/Verizon SMTP server by replacing the mail server name with its IP address. The next time Thunderbird prompts you for the password, enter it, and check the checkbox to save the password using the password manager. If this occurs, delete the perfectly good saved password using " Tools -> Options -> Passwords -> Saved Passwords -> Show Passwords" and restart Thunderbird (because the deleted password is still in memory). Sometimes when a server comes back up after a connection failure, Thunderbird will never log in to the server no matter what you enter. If a server is down, Thunderbird will forget your password and will keep asking you to re-enter it till it connects to the server or until you Cancel, whichever comes first.
