The cancel() function of the downloads API cancels a download. The call will fail if the download is not active: for example, because it has completed downloading.

This is an asynchronous function that returns a Promise.


var canceling = browser.downloads.cancel(
  downloadId      // integer


integer. The id of the download to cancel.

Return value

A Promise. If the request was successful, the promise will be fulfilled with no arguments. If the request failed, the promise will be rejected with an error message.

Browser compatibility

BCD tables only load in the browser


var downloadId = 13;

function onCanceled() {
  console.log(`Canceled download`);

function onError(error) {
  console.log(`Error: ${error}`);

var canceling = browser.downloads.cancel(downloadId);
canceling.then(onCanceled, onError);


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

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.