This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

This API is available on Firefox OS for privileged or certified applications only.

The executeScript() method of the HTMLIFrameElement interface allows a specified script to be executed against a page loaded in the browser <iframe>.

Note: Use of the Browser API requires a privileged app, and browser and/or embed-apps permissions, depending on what you want to do. See Using the Browser API for more details.


var <var>myDOMRequest</var> = <var>instanceOfHTMLIframeElement</var>.executeScript(script, options);

Return value

A DOMRequest object that returns an onsuccess handler if the script is successfully executed against the loaded content, or an onerror handler if not.


The script to be executed.
options Optional
Optionally, you can provide an origin or URL for the script to be executed against. It's recommended that you include an origin or URL, in order to ensure that the script is being executed in the expected context:
  • origin: an origin, e.g.
  • url: a URL, e.g.

Note: The options parameter does not currently seem to have much effect. The script seems to execute even if a URL/origin is specified.


var request1 = browser.executeScript(
  var a = 3;
  a + 3
, {url: ''});

request1.onsuccess = function() {
  console.log(request1.result); // 6

var request2 = browser.executeScript(
  new Promise((resolve, reject) => {
    setTimeout(function() {
    }, 1000})
, {origin: ''});

request2.onsuccess = function() {
  console.log(request2.result); // 6

If the script value is a not a Promise, it is simply returned as the request value. If the script value is a Promise, the result of the request will be the Promise-resolved value.


Not part of any specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support Not supported Not supported Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) Firefox OS (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support Not supported Not supported 1.0.1 Not supported Not supported Not supported

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Browser Browser API DOM API executeScript HTMLIFrameElement Method Non-standard Reference