Bugzilla

(In reply to me from comment #3)
> I also do not have AVG, and use Windows Defender, using the default settings. On both of my machines I was logged out of 1Password X and Firefox Sync.

Are your logins actually missing from your profile? Or did you get logged out - as this would be a different bug. Check "Logins and Password" in the main menu (or via preferences at about:preferences#privacy).  

Both: Could you check about:profiles to see if you are using the expected profile or if a new one was created after the upgrade, leaving your saved logins behind.

Are either you using master password? I so, Matt's comment on https://bugzilla.mozilla.org/show_bug.cgi?id=1558765#c6 are probably our next best steps: 

* Please try to move pkcs11.txt from your profile folder to the trash (keep a copy in case we need to inspect it). You can find your profile folder using the button in about:support (load that URL in the browser). Logins are saved in logins.json in that same folder and the encryption key is stored in key4.db.

Both: Can you please attach debug logs from after [setting the signon.debug pref](https://wiki.mozilla.org/Toolkit:Password_Manager/Debugging) . and restarting Firefox. Then load chrome://passwordmgr/content/passwordManager.xul and attach the logs as a file here.

(In reply to me from comment #3)
> I also do not have AVG, and use Windows Defender, using the default settings. On both of my machines I was logged out of 1Password X and Firefox Sync.

Are your logins actually missing from your profile? Or did you get logged out - as this would be a different bug. Check "Logins and Password" in the main menu (or via preferences at about:preferences#privacy).  

Both: Could you check about:profiles to see if you are using the expected profile or if a new one was created after the upgrade, leaving your saved logins behind.

Are either you using master password? If so, Matt's comment on https://bugzilla.mozilla.org/show_bug.cgi?id=1558765#c6 are probably our next best steps: 

* Please try to move pkcs11.txt from your profile folder to the trash (keep a copy in case we need to inspect it). You can find your profile folder using the button in about:support (load that URL in the browser). Logins are saved in logins.json in that same folder and the encryption key is stored in key4.db.

Both: Can you please attach debug logs from after [setting the signon.debug pref](https://wiki.mozilla.org/Toolkit:Password_Manager/Debugging) . and restarting Firefox. Then load chrome://passwordmgr/content/passwordManager.xul and attach the logs as a file here.