gecko-dev/toolkit/components/antitracking/test/browser/browser_backgroundImageAssertion.js

add_task(async function() {
  info("Starting subResources test");

  await SpecialPowers.flushPrefEnv();
  await SpecialPowers.pushPrefEnv({
    set: [
      [
        "network.cookie.cookieBehavior",
        Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER,
      ],
      [
        "network.cookie.cookieBehavior.pbmode",
        Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER,
      ],
      ["privacy.trackingprotection.enabled", false],
      ["privacy.trackingprotection.pbmode.enabled", false],
      ["privacy.trackingprotection.annotate_channels", true],
      [
        "privacy.restrict3rdpartystorage.userInteractionRequiredForHosts",
        "tracking.example.com,tracking.example.org",
      ],
    ],
  });

  await UrlClassifierTestUtils.addTestTrackers();

  let tab = BrowserTestUtils.addTab(gBrowser, TEST_TOP_PAGE);
  gBrowser.selectedTab = tab;

  let browser = gBrowser.getBrowserForTab(tab);
  await BrowserTestUtils.browserLoaded(browser);

  await SpecialPowers.spawn(
    browser,
    [{ page: TEST_3RD_PARTY_PAGE_WITH_SVG }],
    async function(obj) {
      await new content.Promise(resolve => {
        let ifr = content.document.createElement("iframe");

        content.addEventListener("message", function msg(event) {
          if (event.data.type == "finish") {
            content.removeEventListener("message", msg);
            resolve();
            return;
          }

          ok(false, "Unknown message");
        });

        content.document.body.appendChild(ifr);
        ifr.src = obj.page;
      });
    }
  );

  ok(true, "No crash, hopefully!");
  BrowserTestUtils.removeTab(tab);

  UrlClassifierTestUtils.cleanupTestTrackers();
});

add_task(async function() {
  info("Cleaning up.");
  await new Promise(resolve => {
    Services.clearData.deleteData(Ci.nsIClearDataService.CLEAR_ALL, value =>
      resolve()
    );
  });
});