javascriptfirefoxdom-eventsaddeventlistenerxul

Firefox extension. DOMContentLoaded fires more than once on some pages

window.addEventListener('load', function () {
gBrowser.addEventListener('DOMContentLoaded', function () {
    // stuff that happens for each web page load goes here
}, false),false)

I am having the following problem with this code: DOMContentLoaded fires more than once on some pages.

Solution

  • DOMContentLoaded will be called for iframes as well. If you want to ignore these calls, you can do something like this:

    function onLoaded(event) {
  var isFrame = (event.target instanceof Ci.nsIDOMHTMLDocument &&
    event.target != browser.contentDocument);
  if (isFrame) {
    return;
  }
}