Verified this issue using: Firefox 80.0a1 (BuildId:20200721094241), Firefox 79.0 (BuildId:20200720193547) and Firefox 78.1.0esr (provided in comment 12) on Windows 10 64bit, macOS 10.14 and Ubuntu 18.04 64bit. The `MasterPassword` key was renamed to `PrimaryPassword` and the original policy functionality remains intact. Tested using a policies.json file with the policy on both true and false values. On true - The Primary Password creation is enabled. - Once created, the password cannot be removed. On false - The Primary Password creation is disabled.
Bug 1653584 Comment 15 Edit History
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Verified this using: Firefox 80.0a1 (BuildId:20200721094241), Firefox 79.0 (BuildId:20200720193547) and Firefox 78.1.0esr (provided in comment 12) on Windows 10 64bit, macOS 10.14 and Ubuntu 18.04 64bit. The `MasterPassword` key was renamed to `PrimaryPassword` and the original policy functionality remains intact. Tested using a policies.json file with the policy on both true and false values. On true - The Primary Password creation is enabled. - Once created, the password cannot be removed. On false - The Primary Password creation is disabled.