Fix passwords disappearing due to AVG security software

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  • Revision id: 183000
  • Created:
  • Creator: AliceWyman
  • Comment: numbered steps
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: AliceWyman
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: Yes
  • Readied for localization:
  • Readied for localization by: AliceWyman
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The “Password Protection” feature of AVG security software has caused logins and passwords stored in Firefox to disappear after recent updates to Firefox. It may also cause users to experience disruptions in syncing devices as they may get logged-out repeatedly from their Firefox Account, even if they do not store logins and passwords.

Note: Mozilla plans to release an add-on to address this issue. This article will be updated when the add-on is available.

Affected Firefox versions:

  • Release 67.0.2
  • Beta 68.0b9 and higher
  • Nightly versions since June 7, 2019

By now AVG should have an update available to their software which stops further problems with logins and passwords in Firefox. The fix by AVG is in virus definition 19061402 and higher.

First make sure that AVG is up-to-date, so it no longer corrupts your login and password file. To manually trigger an update to AVG:

  1. Double-click the AVG icon on your desktop to open the application.
  2. Click the Refresh icon next to Virus definition in the bottom-right corner of the main AVG Antivirus screen.
  3. Wait while AVG checks for Virus definition updates.
  4. When the update is complete, you see Virus definitions are up to date.
  5. If you are asked to restart your computer, click Restart Now to reboot immediately.

Firefox logins and passwords can now be recovered with the following steps:

  1. Open the Firefox web browser.
  2. Click the menu button Fx57Menu , click Fx57Help Help and select Troubleshooting Information. The Troubleshooting Information page will open.
  3. Under Application Basics, click the Open Folder button next to Profile Folder. This will open the profile folder.
  4. Click the menu button New Fx Menu and then click ExitQuit Close 29 .

    Click the Firefox menu Fx57Menu , then click Exit. Click the Firefox menu at the top of the screen, then click Quit Firefox.Click the Firefox menu Fx57Menu , then click Quit.

  5. Check if you see a file called logins.json in your profile folder.
    • If you do, rename it to logins.json.old.
  6. Check if you see a file called logins.json.corrupt with a June 2019 date in your profile folder.
    • If you do, right-click on the file, copy it and then rename it to logins.json.
  7. Start Firefox.

Your passwords should now be available and you should be able to sync without signing in again.