Bugzilla

### Beta/Release Uplift Approval Request
* **User impact if declined**: If the user:
* has Primary Password enabled
  * Note: This feature is disabled by default.
* has _not_ authenticated for the current session
* visits a login page with a saved login
* cancels the expected Primary Password prompt on page load (from an attempt to autofill)
* fills in and submits the form with a different login
* cancels the expected Primary Password prompt on form submit (from an attempt to ask if the user wants to save this new login via a doorhanger)
...then the user will see several extra Primary Password prompts if they continue to cancel each one instead of authenticating successfully.
* **Is this code covered by automated tests?**: Yes
* **Has the fix been verified in Nightly?**: No
* **Needs manual test from QE?**: Yes
* **If yes, steps to reproduce**: See STR in the [Description](https://bugzilla.mozilla.org/show_bug.cgi?id=1659655#c0) and QA verification notes in [comment #11](https://bugzilla.mozilla.org/show_bug.cgi?id=1659655#c11).
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: As described above, there are a specific set of conditions that must be met before the user would encounter this bug, so it only affects a small minority of users. The fix itself is very simple and only affects whether or not an autocomplete dropdown for the username field in the password save/update doorhanger shows or not.
* **String changes made/needed**:

### Beta/Release Uplift Approval Request
* **User impact if declined**: If the user:
* has Primary Password enabled
  * Note: This feature is disabled by default.
* has _not_ authenticated for the current session
* visits a login page with a saved login
* cancels the expected Primary Password prompt on page load (from an attempt to autofill)
* fills in and submits the form with a different login
* cancels the expected Primary Password prompt on form submit (from an attempt to ask if the user wants to save this new login via a doorhanger)
...then the user will see several extra Primary Password prompts if they continue to cancel each one instead of authenticating successfully.
* **Is this code covered by automated tests?**: Yes
* **Has the fix been verified in Nightly?**: No
* **Needs manual test from QE?**: Yes
* **If yes, steps to reproduce**: See STR in the [Description](https://bugzilla.mozilla.org/show_bug.cgi?id=1659655#c0) and QA verification notes in [comment #11](https://bugzilla.mozilla.org/show_bug.cgi?id=1659655#c11).
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: As described above, there are a specific set of conditions that must be met before the user would encounter this bug, so it only affects a small minority of users. The fix itself is very simple and only affects whether an autocomplete dropdown for the username field in the password save/update doorhanger shows or not.
* **String changes made/needed**: