Are you using Sync ? Is this deleted key part of entries that show in the main section ? Can you post an example of such a key in a screenshot with cleared out hostname and username/password ?

You can try to edit a copy of this logins.json (or logins-backup.json) file and remove the "deleted":"yes" key/value pair. You can open the edited file in a Firefox tab to ensure that it is still valid JSON.

• https://firefox-source-docs.mozilla.org/devtools-user/json_viewer/

Best is to try using this edited logins.json with key4.db in a new profile that hasn't been used with Sync. See "Creating a profile":

• https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

Our developers have finished their investigation and an update for Firefox for iOS has been published. This is version number 121.1 and we strongly recommend that you update to this as soon as possible.

If you experienced data loss with the previous update we apologise for the inconvenience this may have caused.

You may be able to recover your logins through one of two ways:

1. Use an existing backup of your Firefox profile that you may have taken (see this support article) or,
2. Take a backup of your Firefox profile (this article will help). Keeping Firefox closed, find the file named logins-backup.json. Take a copy of it, rename it to logins.json replacing the existing file with the same name.

We apologise that this has happened. Work is being done internally to reduce the chances of this happening again but we appreciate that this does not make up for the disruption this has caused you.