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The goal of this series of patches is to address the cases where sites don't use standard form submission events. The basic idea is inferring a form is submitted when the form is removed from the DOM tree, but with one premise: There must be a successful fetch or XHR request sent in the document before the form is removed. This is because websites usually send the credentials with a fetch or an XHR. After the request succeeds, the website removes the form. In summary, this patch does the following: 1. Add NotifyFetchOrXHRSuccess API in Document. The API sends a "DOMDocFetchSuccess" event to who registers the event listener. 2. When a fetch request or a XMLHttpReuqest completes and succeeds, call NotifyFetchOrXHRSuccess(). 3. LoginMangerChild listen to `DOMDocFetchSuccess` event only when there is an user interaction on the password field. Differential Revision: https://phabricator.services.mozilla.com/D106024