I have also tested the new-password and confirm-password fields form from changing a Google, Yahoo and Reddit account's password or a yahoo account's password. These fields are not being auto-completed. In the case of the Reddit "update your password" form, the current/about to be changed password field was auto-filled and this is expected, while the "new password" and "verify password" fields are not being auto-filled. Based on all the above, this issue is now considered verified in Nightly v68.0a1 and Beta v67.0b5.
Bug 1119063 Comment 46 Edit History
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I have also tested the new-password and confirm-password fields form from changing a Google, Yahoo and Reddit account's password. These fields are not being auto-completed. In the case of the Reddit "update your password" form, the current (about to be changed) password field was auto-filled and this is expected, while the "new password" and "verify password" fields are not being auto-filled. Based on all the above, this issue is now considered verified in Nightly v68.0a1 and Beta v67.0b5.