Bugzilla

**Affected versions**
Nightly 73
Beta 72

**Affected platforms**
Windows 10 x64 (to be checked on the other OS)

**Steps to reproduce**
- Launch Firefox
- Go to reddit.com
- Log in with valid credentials
- Reach the change password form
- Generate a new secure password, edit it and exit form
- Re-open form, fill in the old password with the valid account password
- Fill in the "New Password" field with the generated password via Context Menu -> Use Securely generated password
- Edit the filled in generated password once more
- Click out of the field
- Toggle the autocomplete dropdown for the "Confirm New Password" and choose the "No username" entry
- Click on Save/Change button on the form

**Expected result**
There should be no password change modal displayed, like in normal browsing mode. The dismissed doorhanger should have the blue key icon and the username for the generated password can be added and saved there. 

**Actual Result**
The "Confirm Password Change" modal is displayed.
The dismissed doorhanger with the blue key is also displayed.
Confirming the changes in the password modal will not dismiss the blue key.

**Note**
This is happening only in Private Browsing mode.
Attached screen recording of private browsing behavior, normal browsing behavior and Log export of the issue.

**Affected versions**
Nightly 73
Beta 72

**Affected platforms**
Windows 10 x64 (to be checked on the other OS)

**Steps to reproduce**
- Launch Firefox and use Private Browsing window
- Go to reddit.com
- Log in with valid credentials
- Reach the change password form
- Generate a new secure password, edit it and exit form
- Re-open form, fill in the old password with the valid account password
- Fill in the "New Password" field with the generated password via Context Menu -> Use Securely generated password
- Edit the filled in generated password once more
- Click out of the field
- Toggle the autocomplete dropdown for the "Confirm New Password" and choose the "No username" entry
- Click on Save/Change button on the form

**Expected result**
There should be no password change modal displayed, like in normal browsing mode. The dismissed doorhanger should have the blue key icon and the username for the generated password can be added and saved there. 

**Actual Result**
The "Confirm Password Change" modal is displayed.
The dismissed doorhanger with the blue key is also displayed.
Confirming the changes in the password modal will not dismiss the blue key.

**Note**
This is happening only in Private Browsing mode.
Attached screen recording of private browsing behavior, normal browsing behavior and Log export of the issue.