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.


let 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


let downloadId = 13;

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

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

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

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