Halt Alert

haltalert.uc.js

// ==UserScript==
// @name         Halt Alert
// @description  Provides ways to escape loop-y modal dialogs.
// @include      chrome://global/content/commonDialog.xul
// @compat       3.5+
// @author       satyr
// @license      X
// ==/UserScript==
setTimeout(function HA_setup(){
  var box = document.documentElement.appendChild(lmn('hbox'));
  self.ha_stop = box.appendChild(lmn(
    'checkbox', {label:'Stop script', accesskey:'S', checked:false}));
  self.ha_wipe = box.appendChild(lmn(
    'checkbox', {label:'Wipe window', accesskey:'W', checked:false}));
  sizeToContent();
  function lmn(name, atrs){
    var lm = document.createElement(name);
    for(let key in atrs) lm.setAttribute(key, atrs[key]);
    return lm;
  }
});
addEventListener('unload', function HA_halt(){ try {
  if(ha_stop.checked)
    opener.QueryInterface(Ci.nsIInterfaceRequestor)
      .getInterface(Ci.nsIWebNavigation).QueryInterface(Ci.nsIDocShell)
        .allowJavascript = false;
  if(ha_wipe.checked) opener.location = 'about:blank';
} catch(e){ Cu.reportError(e) }}, false);