Fired when a network request has finished and its details are available to the extension.

The request is given as a HAR entry object, which is also given an asynchronous getContent() method that gets the response body content.

Note that although your extension can add a listener at any time, it will only start firing after the user has activated the browser's network panel at least once.


Events have three functions:

Adds a listener to this event.
Stop listening to this event. The listener argument is the listener to remove.
Check whether listener is registered for this event. Returns true if it is listening, false otherwise.

addListener syntax



Function that will be called when this event occurs. The function will be passed the following arguments:

object. An object representing the request. This object is a single HAR entry object. It also defines an asynchronous getContent() method, which returns a Promise that resolves with the response body.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxOperaSafariFirefox for Android
onRequestFinishedChrome Full support YesEdge Full support 79Firefox Full support 61
Full support 61
No support 60 — 61
Notes This event will only start firing after the user has activated the browser's network panel at least once.
Opera Full support YesSafari No support NoFirefox Android No support No


Full support  
Full support
No support  
No support
See implementation notes.
See implementation notes.


Add a listener that logs the server IP address and response body for every network request.

function handleRequestFinished(request) {
  console.log("Server IP: ", request.serverIPAddress);
  request.getContent().then(content => {
    console.log("Content: ", content);

This API is based on Chromium's chrome.devtools API.