browser_targetDestroyed.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

add_task(async function eventFiredWhenTabIsClosed({ client }) {

  const { Target } = client;

  const { newTab } = await openTab(Target);

  const tabClosed = BrowserTestUtils.waitForEvent(newTab, "TabClose");

  const targetDestroyed = Target.targetDestroyed();

  info("Closing the tab");

  BrowserTestUtils.removeTab(newTab);

  await tabClosed;

  info("Tab was closed");

  await targetDestroyed;

  info("Received the Target.targetDestroyed event");

});