michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: "use strict";
michael@0: 
michael@0: const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
michael@0: 
michael@0: function whenBrowserLoaded(browser, callback) {
michael@0:   browser.addEventListener("load", function onLoad(event) {
michael@0:     if (event.target == browser.contentDocument) {
michael@0:       browser.removeEventListener("load", onLoad, true);
michael@0:       executeSoon(callback);
michael@0:     }
michael@0:   }, true);
michael@0: }
michael@0: 
michael@0: function waitForOnBeforeUnloadDialog(browser, callback) {
michael@0:   browser.addEventListener("DOMWillOpenModalDialog", function onModalDialog() {
michael@0:     browser.removeEventListener("DOMWillOpenModalDialog", onModalDialog, true);
michael@0: 
michael@0:     executeSoon(() => {
michael@0:       let stack = browser.parentNode;
michael@0:       let dialogs = stack.getElementsByTagNameNS(XUL_NS, "tabmodalprompt");
michael@0:       let {button0, button1} = dialogs[0].ui;
michael@0:       callback(button0, button1);
michael@0:     });
michael@0:   }, true);
michael@0: }