Swaps the login form for an account settings password change form with Current, New, and Confirm Password fields (autocomplete="new-password" on the new one). Tests whether the password generator suggestion appears, and whether the extension offers to update the stored credential afterward.
Check it in DevTools: Elements panel: the New Password input carries autocomplete="new-password", the specific hint most password generators key off to offer a suggestion.
Also active: Dynamic fields added by JS