text: // ----------------------------------------------------------------------------
  // Test whether passing an undefined url InstallTrigger.install throws an
  // exception
  function test() {
    waitForExplicitFinish();
  
    var triggers = encodeURIComponent(JSON.stringify({
      "Unsigned XPI": {
        URL: undefined
      }
    }));
    gBrowser.selectedTab = gBrowser.addTab();
    gBrowser.selectedBrowser.addEventListener("load", function() {
      gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
      // Allow the in-page load handler to run first
      executeSoon(page_loaded);
    }, true);
    expectUncaughtException();
    gBrowser.loadURI(TESTROOT + "installtrigger.html?" + triggers);
  }
  
  function page_loaded() {
    var doc = gBrowser.contentDocument;
    is(doc.getElementById("return").textContent, "exception", "installTrigger should have failed");
    gBrowser.removeCurrentTab();
    finish();
  }
  // ----------------------------------------------------------------------------
  