browser_mixed_content.js

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add_task(async () => {

  await SpecialPowers.pushPrefEnv({

    set: [["security.mixed_content.upgrade_display_content", false]],

});

  const testPath =

    "https://example.com/browser/browser/base/content/test/favicons/file_insecure_favicon.html";

  const expectedIcon =

    "http://example.com/browser/browser/base/content/test/favicons/file_favicon.png";

  let tab = BrowserTestUtils.addTab(gBrowser, testPath);

  gBrowser.selectedTab = tab;

  let browser = tab.linkedBrowser;

  let faviconPromise = waitForLinkAvailable(browser);

  await BrowserTestUtils.browserLoaded(browser);

  let iconURI = await faviconPromise;

  is(iconURI, expectedIcon, "Got correct icon.");

ok(

    gIdentityHandler._isMixedPassiveContentLoaded,

    "Should have seen mixed content."

);

  BrowserTestUtils.removeTab(tab);

});