Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

88 files changed, 6850 insertions, 0 deletions

diff --git a/browser/base/content/test/siteIdentity/browser.ini b/browser/base/content/test/siteIdentity/browser.ini
new file mode 100644
index 0000000000..724669f18a
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser.ini
@@ -0,0 +1,152 @@
+[DEFAULT]
+support-files =
+  head.js
+  dummy_page.html
+  !/image/test/mochitest/blue.png
+
+[browser_about_blank_same_document_tabswitch.js]
+https_first_disabled = true
+support-files =
+  open-self-from-frame.html
+[browser_bug1045809.js]
+tags = mcb
+support-files =
+  file_bug1045809_1.html
+  file_bug1045809_2.html
+[browser_bug822367.js]
+tags = mcb
+support-files =
+  file_bug822367_1.html
+  file_bug822367_1.js
+  file_bug822367_2.html
+  file_bug822367_3.html
+  file_bug822367_4.html
+  file_bug822367_4.js
+  file_bug822367_4B.html
+  file_bug822367_5.html
+  file_bug822367_6.html
+[browser_bug902156.js]
+tags = mcb
+support-files =
+  file_bug902156.js
+  file_bug902156_1.html
+  file_bug902156_2.html
+  file_bug902156_3.html
+[browser_bug906190.js]
+tags = mcb
+support-files =
+  file_bug906190_1.html
+  file_bug906190_2.html
+  file_bug906190_3_4.html
+  file_bug906190_redirected.html
+  file_bug906190.js
+  file_bug906190.sjs
+[browser_check_identity_state.js]
+https_first_disabled = true
+skip-if =
+  os == "win" && os_version == "6.1" # Skip on Azure - frequent failure
+[browser_check_identity_state_pdf.js]
+https_first_disabled = true
+support-files =
+    file_pdf.pdf
+    file_pdf_blob.html
+[browser_csp_block_all_mixedcontent.js]
+tags = mcb
+support-files =
+  file_csp_block_all_mixedcontent.html
+  file_csp_block_all_mixedcontent.js
+[browser_deprecatedTLSVersions.js]
+[browser_geolocation_indicator.js]
+[browser_getSecurityInfo.js]
+https_first_disabled = true
+support-files =
+  dummy_iframe_page.html
+[browser_identityBlock_flicker.js]
+[browser_identityBlock_focus.js]
+support-files = ../permissions/permissions.html
+[browser_identityIcon_img_url.js]
+https_first_disabled = true
+support-files =
+  file_mixedPassiveContent.html
+  file_csp_block_all_mixedcontent.html
+[browser_identityPopup_HttpsOnlyMode.js]
+[browser_identityPopup_clearSiteData.js]
+skip-if = (os == "linux" && bits == 64) # Bug 1577395
+[browser_identityPopup_clearSiteData_extensions.js]
+[browser_identityPopup_custom_roots.js]
+https_first_disabled = true
+[browser_identityPopup_focus.js]
+skip-if =
+  verify
+  os == "linux" && (asan || tsan) # Bug 1723899
+[browser_identity_UI.js]
+https_first_disabled = true
+[browser_iframe_navigation.js]
+https_first_disabled = true
+support-files =
+  iframe_navigation.html
+[browser_ignore_same_page_navigation.js]
+[browser_mcb_redirect.js]
+https_first_disabled = true
+tags = mcb
+support-files =
+  test_mcb_redirect.html
+  test_mcb_redirect_image.html
+  test_mcb_double_redirect_image.html
+  test_mcb_redirect.js
+  test_mcb_redirect.sjs
+[browser_mixedContentFramesOnHttp.js]
+https_first_disabled = true
+tags = mcb
+support-files =
+  file_mixedContentFramesOnHttp.html
+  file_mixedPassiveContent.html
+[browser_mixedContentFromOnunload.js]
+https_first_disabled = true
+tags = mcb
+support-files =
+  file_mixedContentFromOnunload.html
+  file_mixedContentFromOnunload_test1.html
+  file_mixedContentFromOnunload_test2.html
+[browser_mixed_content_cert_override.js]
+skip-if = verify
+tags = mcb
+support-files =
+  test-mixedcontent-securityerrors.html
+[browser_mixed_content_with_navigation.js]
+tags = mcb
+support-files =
+  file_mixedPassiveContent.html
+  file_bug1045809_1.html
+[browser_mixed_passive_content_indicator.js]
+tags = mcb
+support-files =
+  simple_mixed_passive.html
+[browser_mixedcontent_securityflags.js]
+tags = mcb
+support-files =
+  test-mixedcontent-securityerrors.html
+[browser_navigation_failures.js]
+[browser_no_mcb_for_loopback.js]
+tags = mcb
+support-files =
+  ../general/moz.png
+  test_no_mcb_for_loopback.html
+[browser_no_mcb_for_onions.js]
+tags = mcb
+support-files =
+  test_no_mcb_for_onions.html
+[browser_no_mcb_on_http_site.js]
+https_first_disabled = true
+tags = mcb
+support-files =
+  test_no_mcb_on_http_site_img.html
+  test_no_mcb_on_http_site_img.css
+  test_no_mcb_on_http_site_font.html
+  test_no_mcb_on_http_site_font.css
+  test_no_mcb_on_http_site_font2.html
+  test_no_mcb_on_http_site_font2.css
+[browser_secure_transport_insecure_scheme.js]
+https_first_disabled = true
+[browser_session_store_pageproxystate.js]
+[browser_tab_sharing_state.js]
diff --git a/browser/base/content/test/siteIdentity/browser_about_blank_same_document_tabswitch.js b/browser/base/content/test/siteIdentity/browser_about_blank_same_document_tabswitch.js
new file mode 100644
index 0000000000..5e58b4bedb
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_about_blank_same_document_tabswitch.js
@@ -0,0 +1,79 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  "http://example.org"
+);
+
+const TEST_PAGE = TEST_PATH + "open-self-from-frame.html";
+
+add_task(async function test_identityBlock_inherited_blank() {
+  await BrowserTestUtils.withNewTab("https://example.com", async browser => {
+    let identityBox = document.getElementById("identity-box");
+    // Ensure we remove the 3rd party storage permission for example.org, or
+    // it'll mess up other tests:
+    let principal = browser.contentPrincipal;
+    registerCleanupFunction(() => {
+      Services.perms.removeFromPrincipal(
+        principal,
+        "3rdPartyStorage^http://example.org"
+      );
+    });
+    is(
+      identityBox.className,
+      "verifiedDomain",
+      "Should indicate a secure site."
+    );
+    // Open a popup from the web content.
+    let popupPromise = BrowserTestUtils.waitForNewWindow();
+    await SpecialPowers.spawn(browser, [TEST_PAGE], testPage => {
+      content.open(testPage, "_blank", "height=300,width=300");
+    });
+    // Open a tab back in the main window:
+    let popup = await popupPromise;
+    info("Opened popup");
+    let popupBC = popup.gBrowser.selectedBrowser.browsingContext;
+    await TestUtils.waitForCondition(
+      () => popupBC.children[0]?.currentWindowGlobal
+    );
+
+    info("Waiting for button to appear");
+    await SpecialPowers.spawn(popupBC.children[0], [], async () => {
+      await ContentTaskUtils.waitForCondition(() =>
+        content.document.querySelector("button")
+      );
+    });
+
+    info("Got frame contents.");
+
+    let otherTabPromise = BrowserTestUtils.waitForLocationChange(
+      gBrowser,
+      TEST_PAGE
+    );
+    info("Clicking button");
+    await BrowserTestUtils.synthesizeMouseAtCenter(
+      "button",
+      {},
+      popupBC.children[0]
+    );
+    info("Waiting for tab");
+    await otherTabPromise;
+
+    ok(
+      gURLBar.value.startsWith("example.org/"),
+      "URL bar value should be correct, was " + gURLBar.value
+    );
+    is(
+      identityBox.className,
+      "notSecure",
+      "Identity box should have been updated."
+    );
+
+    await BrowserTestUtils.removeTab(gBrowser.selectedTab);
+    await BrowserTestUtils.closeWindow(popup);
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_bug1045809.js b/browser/base/content/test/siteIdentity/browser_bug1045809.js
new file mode 100644
index 0000000000..b39d669d0b
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_bug1045809.js
@@ -0,0 +1,105 @@
+// Test that the Mixed Content Doorhanger Action to re-enable protection works
+
+const PREF_ACTIVE = "security.mixed_content.block_active_content";
+const PREF_INSECURE = "security.insecure_connection_icon.enabled";
+const TEST_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "file_bug1045809_1.html";
+
+var origBlockActive;
+
+add_task(async function () {
+  registerCleanupFunction(function () {
+    Services.prefs.setBoolPref(PREF_ACTIVE, origBlockActive);
+    gBrowser.removeCurrentTab();
+  });
+
+  // Store original preferences so we can restore settings after testing
+  origBlockActive = Services.prefs.getBoolPref(PREF_ACTIVE);
+
+  // Make sure mixed content blocking is on
+  Services.prefs.setBoolPref(PREF_ACTIVE, true);
+
+  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser));
+
+  // Check with insecure lock disabled
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_INSECURE, false]] });
+  await runTests(tab);
+
+  // Check with insecure lock disabled
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_INSECURE, true]] });
+  await runTests(tab);
+});
+
+async function runTests(tab) {
+  // Test 1: mixed content must be blocked
+  await promiseTabLoadEvent(tab, TEST_URL);
+  await test1(gBrowser.getBrowserForTab(tab));
+
+  await promiseTabLoadEvent(tab);
+  // Test 2: mixed content must NOT be blocked
+  await test2(gBrowser.getBrowserForTab(tab));
+
+  // Test 3: mixed content must be blocked again
+  await promiseTabLoadEvent(tab);
+  await test3(gBrowser.getBrowserForTab(tab));
+}
+
+async function test1(gTestBrowser) {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  await SpecialPowers.spawn(gTestBrowser, [], function () {
+    let iframe = content.document.getElementsByTagName("iframe")[0];
+
+    SpecialPowers.spawn(iframe, [], () => {
+      let container = content.document.getElementById("mixedContentContainer");
+      is(container, null, "Mixed Content is NOT to be found in Test1");
+    });
+  });
+
+  // Disable Mixed Content Protection for the page (and reload)
+  gIdentityHandler.disableMixedContentProtection();
+}
+
+async function test2(gTestBrowser) {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: true,
+    activeBlocked: false,
+    passiveLoaded: false,
+  });
+
+  await SpecialPowers.spawn(gTestBrowser, [], function () {
+    let iframe = content.document.getElementsByTagName("iframe")[0];
+
+    SpecialPowers.spawn(iframe, [], () => {
+      let container = content.document.getElementById("mixedContentContainer");
+      isnot(container, null, "Mixed Content is to be found in Test2");
+    });
+  });
+
+  // Re-enable Mixed Content Protection for the page (and reload)
+  gIdentityHandler.enableMixedContentProtection();
+}
+
+async function test3(gTestBrowser) {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  await SpecialPowers.spawn(gTestBrowser, [], function () {
+    let iframe = content.document.getElementsByTagName("iframe")[0];
+
+    SpecialPowers.spawn(iframe, [], () => {
+      let container = content.document.getElementById("mixedContentContainer");
+      is(container, null, "Mixed Content is NOT to be found in Test3");
+    });
+  });
+}
diff --git a/browser/base/content/test/siteIdentity/browser_bug822367.js b/browser/base/content/test/siteIdentity/browser_bug822367.js
new file mode 100644
index 0000000000..881c920899
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_bug822367.js
@@ -0,0 +1,254 @@
+/*
+ * User Override Mixed Content Block - Tests for Bug 822367
+ */
+
+const PREF_DISPLAY = "security.mixed_content.block_display_content";
+const PREF_DISPLAY_UPGRADE = "security.mixed_content.upgrade_display_content";
+const PREF_ACTIVE = "security.mixed_content.block_active_content";
+
+// We alternate for even and odd test cases to simulate different hosts
+const HTTPS_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+const HTTPS_TEST_ROOT_2 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test1.example.com"
+);
+
+var gTestBrowser = null;
+
+add_task(async function test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [PREF_DISPLAY, true],
+      [PREF_DISPLAY_UPGRADE, false],
+      [PREF_ACTIVE, true],
+    ],
+  });
+
+  var newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+  gTestBrowser = gBrowser.selectedBrowser;
+  newTab.linkedBrowser.stop();
+
+  // Mixed Script Test
+  var url = HTTPS_TEST_ROOT + "file_bug822367_1.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser, false, url);
+});
+
+// Mixed Script Test
+add_task(async function MixedTest1A() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  gTestBrowser.ownerGlobal.gIdentityHandler.disableMixedContentProtection();
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+add_task(async function MixedTest1B() {
+  await SpecialPowers.spawn(gTestBrowser, [], async function () {
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("p1").innerHTML == "hello",
+      "Waited too long for mixed script to run in Test 1"
+    );
+  });
+  gTestBrowser.ownerGlobal.gIdentityHandler.enableMixedContentProtectionNoReload();
+});
+
+// Mixed Display Test - Doorhanger should not appear
+add_task(async function MixedTest2() {
+  var url = HTTPS_TEST_ROOT_2 + "file_bug822367_2.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser, false, url);
+
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: false,
+    passiveLoaded: false,
+  });
+});
+
+// Mixed Script and Display Test - User Override should cause both the script and the image to load.
+add_task(async function MixedTest3() {
+  var url = HTTPS_TEST_ROOT + "file_bug822367_3.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser, false, url);
+});
+
+add_task(async function MixedTest3A() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  gTestBrowser.ownerGlobal.gIdentityHandler.disableMixedContentProtection();
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+add_task(async function MixedTest3B() {
+  await SpecialPowers.spawn(gTestBrowser, [], async function () {
+    let p1 = ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("p1").innerHTML == "hello",
+      "Waited too long for mixed script to run in Test 3"
+    );
+    let p2 = ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("p2").innerHTML == "bye",
+      "Waited too long for mixed image to load in Test 3"
+    );
+    await Promise.all([p1, p2]);
+  });
+
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: true,
+    activeBlocked: false,
+    passiveLoaded: true,
+  });
+  gTestBrowser.ownerGlobal.gIdentityHandler.enableMixedContentProtectionNoReload();
+});
+
+// Location change - User override on one page doesn't propagate to another page after location change.
+add_task(async function MixedTest4() {
+  var url = HTTPS_TEST_ROOT_2 + "file_bug822367_4.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser, false, url);
+});
+
+let preLocationChangePrincipal = null;
+add_task(async function MixedTest4A() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  preLocationChangePrincipal = gTestBrowser.contentPrincipal;
+  gTestBrowser.ownerGlobal.gIdentityHandler.disableMixedContentProtection();
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+add_task(async function MixedTest4B() {
+  let url = HTTPS_TEST_ROOT + "file_bug822367_4B.html";
+  await SpecialPowers.spawn(gTestBrowser, [url], async function (wantedUrl) {
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.location == wantedUrl,
+      "Waited too long for mixed script to run in Test 4"
+    );
+  });
+});
+
+add_task(async function MixedTest4C() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  await SpecialPowers.spawn(gTestBrowser, [], async function () {
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("p1").innerHTML == "",
+      "Mixed script loaded in test 4 after location change!"
+    );
+  });
+  SitePermissions.removeFromPrincipal(
+    preLocationChangePrincipal,
+    "mixed-content"
+  );
+});
+
+// Mixed script attempts to load in a document.open()
+add_task(async function MixedTest5() {
+  var url = HTTPS_TEST_ROOT + "file_bug822367_5.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser, false, url);
+});
+
+add_task(async function MixedTest5A() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  gTestBrowser.ownerGlobal.gIdentityHandler.disableMixedContentProtection();
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+add_task(async function MixedTest5B() {
+  await SpecialPowers.spawn(gTestBrowser, [], async function () {
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("p1").innerHTML == "hello",
+      "Waited too long for mixed script to run in Test 5"
+    );
+  });
+  gTestBrowser.ownerGlobal.gIdentityHandler.enableMixedContentProtectionNoReload();
+});
+
+// Mixed script attempts to load in a document.open() that is within an iframe.
+add_task(async function MixedTest6() {
+  var url = HTTPS_TEST_ROOT_2 + "file_bug822367_6.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser, false, url);
+});
+
+add_task(async function MixedTest6A() {
+  gTestBrowser.removeEventListener("load", MixedTest6A, true);
+  let { gIdentityHandler } = gTestBrowser.ownerGlobal;
+
+  await BrowserTestUtils.waitForCondition(
+    () =>
+      gIdentityHandler._identityBox.classList.contains("mixedActiveBlocked"),
+    "Waited too long for control center to get mixed active blocked state"
+  );
+});
+
+add_task(async function MixedTest6B() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  gTestBrowser.ownerGlobal.gIdentityHandler.disableMixedContentProtection();
+
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+add_task(async function MixedTest6C() {
+  await SpecialPowers.spawn(gTestBrowser, [], async function () {
+    function test() {
+      try {
+        return (
+          content.document
+            .getElementById("f1")
+            .contentDocument.getElementById("p1").innerHTML == "hello"
+        );
+      } catch (e) {
+        return false;
+      }
+    }
+
+    await ContentTaskUtils.waitForCondition(
+      test,
+      "Waited too long for mixed script to run in Test 6"
+    );
+  });
+});
+
+add_task(async function MixedTest6D() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: true,
+    activeBlocked: false,
+    passiveLoaded: false,
+  });
+  gTestBrowser.ownerGlobal.gIdentityHandler.enableMixedContentProtectionNoReload();
+});
+
+add_task(async function cleanup() {
+  gBrowser.removeCurrentTab();
+});
diff --git a/browser/base/content/test/siteIdentity/browser_bug902156.js b/browser/base/content/test/siteIdentity/browser_bug902156.js
new file mode 100644
index 0000000000..3485771427
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_bug902156.js
@@ -0,0 +1,171 @@
+/*
+ * Description of the Tests for
+ *  - Bug 902156: Persist "disable protection" option for Mixed Content Blocker
+ *
+ * 1. Navigate to the same domain via document.location
+ *    - Load a html page which has mixed content
+ *    - Control Center button to disable protection appears - we disable it
+ *    - Load a new page from the same origin using document.location
+ *    - Control Center button should not appear anymore!
+ *
+ * 2. Navigate to the same domain via simulateclick for a link on the page
+ *    - Load a html page which has mixed content
+ *    - Control Center button to disable protection appears - we disable it
+ *    - Load a new page from the same origin simulating a click
+ *    - Control Center button should not appear anymore!
+ *
+ * 3. Navigate to a differnet domain and show the content is still blocked
+ *    - Load a different html page which has mixed content
+ *    - Control Center button to disable protection should appear again because
+ *      we navigated away from html page where we disabled the protection.
+ *
+ * Note, for all tests we set gHttpTestRoot to use 'https'.
+ */
+
+const PREF_ACTIVE = "security.mixed_content.block_active_content";
+
+// We alternate for even and odd test cases to simulate different hosts.
+const HTTPS_TEST_ROOT_1 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test1.example.com"
+);
+const HTTPS_TEST_ROOT_2 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test2.example.com"
+);
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_ACTIVE, true]] });
+});
+
+add_task(async function test1() {
+  let url = HTTPS_TEST_ROOT_1 + "file_bug902156_1.html";
+  await BrowserTestUtils.withNewTab(url, async function (browser) {
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: false,
+      activeBlocked: true,
+      passiveLoaded: false,
+    });
+
+    // Disable Mixed Content Protection for the page (and reload)
+    let browserLoaded = BrowserTestUtils.browserLoaded(browser, false, url);
+    let { gIdentityHandler } = browser.ownerGlobal;
+    gIdentityHandler.disableMixedContentProtection();
+    await browserLoaded;
+
+    await SpecialPowers.spawn(browser, [], async function () {
+      let expected = "Mixed Content Blocker disabled";
+      await ContentTaskUtils.waitForCondition(
+        () =>
+          content.document.getElementById("mctestdiv").innerHTML == expected,
+        "Error: Waited too long for mixed script to run in Test 1"
+      );
+
+      let actual = content.document.getElementById("mctestdiv").innerHTML;
+      is(
+        actual,
+        "Mixed Content Blocker disabled",
+        "OK: Executed mixed script in Test 1"
+      );
+    });
+
+    // The Script loaded after we disabled the page, now we are going to reload the
+    // page and see if our decision is persistent
+    url = HTTPS_TEST_ROOT_1 + "file_bug902156_2.html";
+    browserLoaded = BrowserTestUtils.browserLoaded(browser, false, url);
+    BrowserTestUtils.loadURIString(browser, url);
+    await browserLoaded;
+
+    // The Control Center button should appear but isMixedContentBlocked should be NOT true,
+    // because our decision of disabling the mixed content blocker is persistent.
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: true,
+      activeBlocked: false,
+      passiveLoaded: false,
+    });
+    await SpecialPowers.spawn(browser, [], function () {
+      let actual = content.document.getElementById("mctestdiv").innerHTML;
+      is(
+        actual,
+        "Mixed Content Blocker disabled",
+        "OK: Executed mixed script in Test 1"
+      );
+    });
+    gIdentityHandler.enableMixedContentProtection();
+  });
+});
+
+// ------------------------ Test 2 ------------------------------
+
+add_task(async function test2() {
+  let url = HTTPS_TEST_ROOT_2 + "file_bug902156_2.html";
+  await BrowserTestUtils.withNewTab(url, async function (browser) {
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: false,
+      activeBlocked: true,
+      passiveLoaded: false,
+    });
+
+    // Disable Mixed Content Protection for the page (and reload)
+    let browserLoaded = BrowserTestUtils.browserLoaded(browser, false, url);
+    let { gIdentityHandler } = browser.ownerGlobal;
+    gIdentityHandler.disableMixedContentProtection();
+    await browserLoaded;
+
+    await SpecialPowers.spawn(browser, [], async function () {
+      let expected = "Mixed Content Blocker disabled";
+      await ContentTaskUtils.waitForCondition(
+        () =>
+          content.document.getElementById("mctestdiv").innerHTML == expected,
+        "Error: Waited too long for mixed script to run in Test 2"
+      );
+
+      let actual = content.document.getElementById("mctestdiv").innerHTML;
+      is(
+        actual,
+        "Mixed Content Blocker disabled",
+        "OK: Executed mixed script in Test 2"
+      );
+    });
+
+    // The Script loaded after we disabled the page, now we are going to reload the
+    // page and see if our decision is persistent
+    url = HTTPS_TEST_ROOT_2 + "file_bug902156_1.html";
+    browserLoaded = BrowserTestUtils.browserLoaded(browser, false, url);
+    // reload the page using the provided link in the html file
+    await SpecialPowers.spawn(browser, [], function () {
+      let mctestlink = content.document.getElementById("mctestlink");
+      mctestlink.click();
+    });
+    await browserLoaded;
+
+    // The Control Center button should appear but isMixedContentBlocked should be NOT true,
+    // because our decision of disabling the mixed content blocker is persistent.
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: true,
+      activeBlocked: false,
+      passiveLoaded: false,
+    });
+
+    await SpecialPowers.spawn(browser, [], function () {
+      let actual = content.document.getElementById("mctestdiv").innerHTML;
+      is(
+        actual,
+        "Mixed Content Blocker disabled",
+        "OK: Executed mixed script in Test 2"
+      );
+    });
+    gIdentityHandler.enableMixedContentProtection();
+  });
+});
+
+add_task(async function test3() {
+  let url = HTTPS_TEST_ROOT_1 + "file_bug902156_3.html";
+  await BrowserTestUtils.withNewTab(url, async function (browser) {
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: false,
+      activeBlocked: true,
+      passiveLoaded: false,
+    });
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_bug906190.js b/browser/base/content/test/siteIdentity/browser_bug906190.js
new file mode 100644
index 0000000000..a0410e76cb
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_bug906190.js
@@ -0,0 +1,340 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests the persistence of the "disable protection" option for Mixed Content
+ * Blocker in child tabs (bug 906190).
+ */
+
+requestLongerTimeout(2);
+
+// We use the different urls for testing same origin checks before allowing
+// mixed content on child tabs.
+const HTTPS_TEST_ROOT_1 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test1.example.com"
+);
+const HTTPS_TEST_ROOT_2 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test2.example.com"
+);
+
+/**
+ * For all tests, we load the pages over HTTPS and test both:
+ *   - |CTRL+CLICK|
+ *   - |RIGHT CLICK -> OPEN LINK IN TAB|
+ */
+async function doTest(
+  parentTabSpec,
+  childTabSpec,
+  testTaskFn,
+  waitForMetaRefresh
+) {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: parentTabSpec,
+    },
+    async function (browser) {
+      // As a sanity check, test that active content has been blocked as expected.
+      await assertMixedContentBlockingState(gBrowser, {
+        activeLoaded: false,
+        activeBlocked: true,
+        passiveLoaded: false,
+      });
+
+      // Disable the Mixed Content Blocker for the page, which reloads it.
+      let promiseReloaded = BrowserTestUtils.browserLoaded(browser);
+      let principal = gBrowser.contentPrincipal;
+      gIdentityHandler.disableMixedContentProtection();
+      await promiseReloaded;
+
+      // Wait for the script in the page to update the contents of the test div.
+      await SpecialPowers.spawn(
+        browser,
+        [childTabSpec],
+        async childTabSpecContent => {
+          let testDiv = content.document.getElementById("mctestdiv");
+          await ContentTaskUtils.waitForCondition(
+            () => testDiv.innerHTML == "Mixed Content Blocker disabled"
+          );
+
+          // Add the link for the child tab to the page.
+          let mainDiv = content.document.createElement("div");
+
+          // eslint-disable-next-line no-unsanitized/property
+          mainDiv.innerHTML =
+            '<p><a id="linkToOpenInNewTab" href="' +
+            childTabSpecContent +
+            '">Link</a></p>';
+          content.document.body.appendChild(mainDiv);
+        }
+      );
+
+      // Execute the test in the child tabs with the two methods to open it.
+      for (let openFn of [simulateCtrlClick, simulateContextMenuOpenInTab]) {
+        let promiseTabLoaded = waitForSomeTabToLoad();
+        openFn(browser);
+        await promiseTabLoaded;
+        gBrowser.selectTabAtIndex(2);
+
+        if (waitForMetaRefresh) {
+          await waitForSomeTabToLoad();
+        }
+
+        await testTaskFn();
+
+        gBrowser.removeCurrentTab();
+      }
+
+      SitePermissions.removeFromPrincipal(principal, "mixed-content");
+    }
+  );
+}
+
+function simulateCtrlClick(browser) {
+  BrowserTestUtils.synthesizeMouseAtCenter(
+    "#linkToOpenInNewTab",
+    { ctrlKey: true, metaKey: true },
+    browser
+  );
+}
+
+function simulateContextMenuOpenInTab(browser) {
+  BrowserTestUtils.waitForEvent(document, "popupshown", false, event => {
+    // These are operations that must be executed synchronously with the event.
+    document.getElementById("context-openlinkintab").doCommand();
+    event.target.hidePopup();
+    return true;
+  });
+  BrowserTestUtils.synthesizeMouseAtCenter(
+    "#linkToOpenInNewTab",
+    { type: "contextmenu", button: 2 },
+    browser
+  );
+}
+
+// Waits for a load event somewhere in the browser but ignore events coming
+// from <xul:browser>s without a tab assigned. That are most likely browsers
+// that preload the new tab page.
+function waitForSomeTabToLoad() {
+  return BrowserTestUtils.firstBrowserLoaded(window, true, browser => {
+    let tab = gBrowser.getTabForBrowser(browser);
+    return !!tab;
+  });
+}
+
+/**
+ * Ensure the Mixed Content Blocker is enabled.
+ */
+add_task(async function test_initialize() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["security.mixed_content.block_active_content", true],
+      // We need to disable the dFPI heuristic. So, we won't have unnecessary
+      // 3rd party cookie permission that could affect following tests because
+      // it will create a permission icon on the URL bar.
+      ["privacy.restrict3rdpartystorage.heuristic.recently_visited", false],
+    ],
+  });
+});
+
+/**
+ * 1. - Load a html page which has mixed content
+ *    - Doorhanger to disable protection appears - we disable it
+ *    - Load a subpage from the same origin in a new tab simulating a click
+ *    - Doorhanger should >> NOT << appear anymore!
+ */
+add_task(async function test_same_origin() {
+  await doTest(
+    HTTPS_TEST_ROOT_1 + "file_bug906190_1.html",
+    HTTPS_TEST_ROOT_1 + "file_bug906190_2.html",
+    async function () {
+      // The doorhanger should appear but activeBlocked should be >> NOT << true,
+      // because our decision of disabling the mixed content blocker is persistent
+      // across tabs.
+      await assertMixedContentBlockingState(gBrowser, {
+        activeLoaded: true,
+        activeBlocked: false,
+        passiveLoaded: false,
+      });
+
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        Assert.equal(
+          content.document.getElementById("mctestdiv").innerHTML,
+          "Mixed Content Blocker disabled",
+          "OK: Executed mixed script"
+        );
+      });
+    }
+  );
+});
+
+/**
+ * 2. - Load a html page which has mixed content
+ *    - Doorhanger to disable protection appears - we disable it
+ *    - Load a new page from a different origin in a new tab simulating a click
+ *    - Doorhanger >> SHOULD << appear again!
+ */
+add_task(async function test_different_origin() {
+  await doTest(
+    HTTPS_TEST_ROOT_1 + "file_bug906190_2.html",
+    HTTPS_TEST_ROOT_2 + "file_bug906190_2.html",
+    async function () {
+      // The doorhanger should appear and activeBlocked should be >> TRUE <<,
+      // because our decision of disabling the mixed content blocker should only
+      // persist if pages are from the same domain.
+      await assertMixedContentBlockingState(gBrowser, {
+        activeLoaded: false,
+        activeBlocked: true,
+        passiveLoaded: false,
+      });
+
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        Assert.equal(
+          content.document.getElementById("mctestdiv").innerHTML,
+          "Mixed Content Blocker enabled",
+          "OK: Blocked mixed script"
+        );
+      });
+    }
+  );
+});
+
+/**
+ * 3. - Load a html page which has mixed content
+ *    - Doorhanger to disable protection appears - we disable it
+ *    - Load a new page from the same origin in a new tab simulating a click
+ *    - Redirect to another page from the same origin using meta-refresh
+ *    - Doorhanger should >> NOT << appear again!
+ */
+add_task(async function test_same_origin_metarefresh_same_origin() {
+  // file_bug906190_3_4.html redirects to page test1.example.com/* using meta-refresh
+  await doTest(
+    HTTPS_TEST_ROOT_1 + "file_bug906190_1.html",
+    HTTPS_TEST_ROOT_1 + "file_bug906190_3_4.html",
+    async function () {
+      // The doorhanger should appear but activeBlocked should be >> NOT << true!
+      await assertMixedContentBlockingState(gBrowser, {
+        activeLoaded: true,
+        activeBlocked: false,
+        passiveLoaded: false,
+      });
+
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        Assert.equal(
+          content.document.getElementById("mctestdiv").innerHTML,
+          "Mixed Content Blocker disabled",
+          "OK: Executed mixed script"
+        );
+      });
+    },
+    true
+  );
+});
+
+/**
+ * 4. - Load a html page which has mixed content
+ *    - Doorhanger to disable protection appears - we disable it
+ *    - Load a new page from the same origin in a new tab simulating a click
+ *    - Redirect to another page from a different origin using meta-refresh
+ *    - Doorhanger >> SHOULD << appear again!
+ */
+add_task(async function test_same_origin_metarefresh_different_origin() {
+  await doTest(
+    HTTPS_TEST_ROOT_2 + "file_bug906190_1.html",
+    HTTPS_TEST_ROOT_2 + "file_bug906190_3_4.html",
+    async function () {
+      // The doorhanger should appear and activeBlocked should be >> TRUE <<.
+      await assertMixedContentBlockingState(gBrowser, {
+        activeLoaded: false,
+        activeBlocked: true,
+        passiveLoaded: false,
+      });
+
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        Assert.equal(
+          content.document.getElementById("mctestdiv").innerHTML,
+          "Mixed Content Blocker enabled",
+          "OK: Blocked mixed script"
+        );
+      });
+    },
+    true
+  );
+});
+
+/**
+ * 5. - Load a html page which has mixed content
+ *    - Doorhanger to disable protection appears - we disable it
+ *    - Load a new page from the same origin in a new tab simulating a click
+ *    - Redirect to another page from the same origin using 302 redirect
+ */
+add_task(async function test_same_origin_302redirect_same_origin() {
+  // the sjs files returns a 302 redirect- note, same origins
+  await doTest(
+    HTTPS_TEST_ROOT_1 + "file_bug906190_1.html",
+    HTTPS_TEST_ROOT_1 + "file_bug906190.sjs",
+    async function () {
+      // The doorhanger should appear but activeBlocked should be >> NOT << true.
+      // Currently it is >> TRUE << - see follow up bug 914860
+      ok(
+        !gIdentityHandler._identityBox.classList.contains("mixedActiveBlocked"),
+        "OK: Mixed Content is NOT being blocked"
+      );
+
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        Assert.equal(
+          content.document.getElementById("mctestdiv").innerHTML,
+          "Mixed Content Blocker disabled",
+          "OK: Executed mixed script"
+        );
+      });
+    }
+  );
+});
+
+/**
+ * 6. - Load a html page which has mixed content
+ *    - Doorhanger to disable protection appears - we disable it
+ *    - Load a new page from the same origin in a new tab simulating a click
+ *    - Redirect to another page from a different origin using 302 redirect
+ */
+add_task(async function test_same_origin_302redirect_different_origin() {
+  // the sjs files returns a 302 redirect - note, different origins
+  await doTest(
+    HTTPS_TEST_ROOT_2 + "file_bug906190_1.html",
+    HTTPS_TEST_ROOT_2 + "file_bug906190.sjs",
+    async function () {
+      // The doorhanger should appear and activeBlocked should be >> TRUE <<.
+      await assertMixedContentBlockingState(gBrowser, {
+        activeLoaded: false,
+        activeBlocked: true,
+        passiveLoaded: false,
+      });
+
+      await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+        Assert.equal(
+          content.document.getElementById("mctestdiv").innerHTML,
+          "Mixed Content Blocker enabled",
+          "OK: Blocked mixed script"
+        );
+      });
+    }
+  );
+});
+
+/**
+ * 7. - Test memory leak issue on redirection error. See Bug 1269426.
+ */
+add_task(async function test_bad_redirection() {
+  // the sjs files returns a 302 redirect - note, different origins
+  await doTest(
+    HTTPS_TEST_ROOT_2 + "file_bug906190_1.html",
+    HTTPS_TEST_ROOT_2 + "file_bug906190.sjs?bad-redirection=1",
+    function () {
+      // Nothing to do. Just see if memory leak is reported in the end.
+      ok(true, "Nothing to do");
+    }
+  );
+});
diff --git a/browser/base/content/test/siteIdentity/browser_check_identity_state.js b/browser/base/content/test/siteIdentity/browser_check_identity_state.js
new file mode 100644
index 0000000000..e5ecbc66f2
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_check_identity_state.js
@@ -0,0 +1,882 @@
+/*
+ * Test the identity mode UI for a variety of page types
+ */
+
+"use strict";
+
+const DUMMY = "browser/browser/base/content/test/siteIdentity/dummy_page.html";
+const INSECURE_ICON_PREF = "security.insecure_connection_icon.enabled";
+const INSECURE_TEXT_PREF = "security.insecure_connection_text.enabled";
+const INSECURE_PBMODE_ICON_PREF =
+  "security.insecure_connection_icon.pbmode.enabled";
+const HTTPS_FIRST_PBM_PREF = "dom.security.https_first_pbm";
+
+function loadNewTab(url) {
+  return BrowserTestUtils.openNewForegroundTab(gBrowser, url, true);
+}
+
+function getConnectionState() {
+  // Prevents items that are being lazy loaded causing issues
+  document.getElementById("identity-icon-box").click();
+  gIdentityHandler.refreshIdentityPopup();
+  return document.getElementById("identity-popup").getAttribute("connection");
+}
+
+function getSecurityConnectionBG() {
+  // Get the background image of the security connection.
+  document.getElementById("identity-icon-box").click();
+  gIdentityHandler.refreshIdentityPopup();
+  return gBrowser.ownerGlobal
+    .getComputedStyle(
+      document
+        .getElementById("identity-popup-mainView")
+        .getElementsByClassName("identity-popup-security-connection")[0]
+    )
+    .getPropertyValue("list-style-image");
+}
+
+async function getReaderModeURL() {
+  // Gets the reader mode URL from "identity-popup mainView panel header span"
+  document.getElementById("identity-icon-box").click();
+  gIdentityHandler.refreshIdentityPopup();
+
+  let headerSpan = document.getElementById(
+    "identity-popup-mainView-panel-header-span"
+  );
+  await BrowserTestUtils.waitForCondition(() =>
+    headerSpan.innerHTML.includes("example.com")
+  );
+  return headerSpan.innerHTML;
+}
+
+// This test is slow on Linux debug e10s
+requestLongerTimeout(2);
+
+add_task(async function chromeUITest() {
+  // needs to be set due to bug in ion.js that occurs when testing
+  SpecialPowers.pushPrefEnv({
+    set: [
+      ["toolkit.pioneer.testCachedContent", "[]"],
+      ["toolkit.pioneer.testCachedAddons", "[]"],
+    ],
+  });
+  // Might needs to be extended with new secure chrome pages
+  // about:debugging is a secure chrome UI but is not tested for causing problems.
+  let secureChromePages = [
+    "addons",
+    "cache",
+    "certificate",
+    "compat",
+    "config",
+    "downloads",
+    "ion",
+    "license",
+    "logins",
+    "loginsimportreport",
+    "performance",
+    "plugins",
+    "policies",
+    "preferences",
+    "processes",
+    "profiles",
+    "profiling",
+    "protections",
+    "rights",
+    "sessionrestore",
+    "studies",
+    "support",
+    "telemetry",
+    "welcomeback",
+  ];
+
+  // else skip about:crashes, it is only available with plugin
+  if (AppConstants.MOZ_CRASHREPORTER) {
+    secureChromePages.push("crashes");
+  }
+
+  let nonSecureExamplePages = [
+    "about:about",
+    "about:credits",
+    "about:home",
+    "about:logo",
+    "about:memory",
+    "about:mozilla",
+    "about:networking",
+    "about:privatebrowsing",
+    "about:robots",
+    "about:serviceWorkers",
+    "about:sync-log",
+    "about:unloads",
+    "about:url-classifier",
+    "about:webrtc",
+    "about:welcome",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.com/" + DUMMY,
+  ];
+
+  for (let i = 0; i < secureChromePages.length; i++) {
+    await BrowserTestUtils.withNewTab("about:" + secureChromePages[i], () => {
+      is(getIdentityMode(), "chromeUI", "Identity should be chromeUI");
+    });
+  }
+
+  for (let i = 0; i < nonSecureExamplePages.length; i++) {
+    console.log(nonSecureExamplePages[i]);
+    await BrowserTestUtils.withNewTab(nonSecureExamplePages[i], () => {
+      ok(getIdentityMode() != "chromeUI", "Identity should not be chromeUI");
+    });
+  }
+});
+
+async function webpageTest(secureCheck) {
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  let oldTab = await loadNewTab("about:robots");
+
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  let newTab = await loadNewTab("http://example.com/" + DUMMY);
+  if (secureCheck) {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  if (secureCheck) {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_webpage() {
+  await webpageTest(false);
+  await webpageTest(true);
+});
+
+async function webpageTestTextWarning(secureCheck) {
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_TEXT_PREF, secureCheck]] });
+  let oldTab = await loadNewTab("about:robots");
+
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  let newTab = await loadNewTab("http://example.com/" + DUMMY);
+  if (secureCheck) {
+    is(
+      getIdentityMode(),
+      "notSecure notSecureText",
+      "Identity should have not secure text"
+    );
+  } else {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+  }
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  if (secureCheck) {
+    is(
+      getIdentityMode(),
+      "notSecure notSecureText",
+      "Identity should have not secure text"
+    );
+  } else {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+  }
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_webpage_text_warning() {
+  await webpageTestTextWarning(false);
+  await webpageTestTextWarning(true);
+});
+
+async function webpageTestTextWarningCombined(secureCheck) {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [INSECURE_TEXT_PREF, secureCheck],
+      [INSECURE_ICON_PREF, secureCheck],
+    ],
+  });
+  let oldTab = await loadNewTab("about:robots");
+
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  let newTab = await loadNewTab("http://example.com/" + DUMMY);
+  if (secureCheck) {
+    is(
+      getIdentityMode(),
+      "notSecure notSecureText",
+      "Identity should be not secure"
+    );
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+
+  gBrowser.selectedTab = newTab;
+  if (secureCheck) {
+    is(
+      getIdentityMode(),
+      "notSecure notSecureText",
+      "Identity should be not secure"
+    );
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_webpage_text_warning_combined() {
+  await webpageTestTextWarning(false);
+  await webpageTestTextWarning(true);
+});
+
+async function blankPageTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+
+  let newTab = await loadNewTab("about:blank");
+  is(
+    gURLBar.getAttribute("pageproxystate"),
+    "invalid",
+    "pageproxystate should be invalid"
+  );
+
+  gBrowser.selectedTab = oldTab;
+  is(
+    gURLBar.getAttribute("pageproxystate"),
+    "valid",
+    "pageproxystate should be valid"
+  );
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(
+    gURLBar.getAttribute("pageproxystate"),
+    "invalid",
+    "pageproxystate should be invalid"
+  );
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_blank() {
+  await blankPageTest(true);
+  await blankPageTest(false);
+});
+
+async function secureTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+
+  let newTab = await loadNewTab("https://example.com/" + DUMMY);
+  is(getIdentityMode(), "verifiedDomain", "Identity should be verified");
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(getIdentityMode(), "verifiedDomain", "Identity should be verified");
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_secure_enabled() {
+  await secureTest(true);
+  await secureTest(false);
+});
+
+async function viewSourceTest() {
+  let sourceTab = await loadNewTab("view-source:https://example.com/" + DUMMY);
+
+  gBrowser.selectedTab = sourceTab;
+  is(
+    getIdentityMode(),
+    "verifiedDomain",
+    "Identity should be verified while viewing source"
+  );
+
+  gBrowser.removeTab(sourceTab);
+}
+
+add_task(async function test_viewSource() {
+  await viewSourceTest();
+});
+
+async function insecureTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  let newTab = await loadNewTab("http://example.com/" + DUMMY);
+  if (secureCheck) {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+    is(
+      document.getElementById("identity-icon").getAttribute("tooltiptext"),
+      gNavigatorBundle.getString("identity.notSecure.tooltip"),
+      "The insecure lock icon has a correct tooltip text."
+    );
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  if (secureCheck) {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+    is(
+      document.getElementById("identity-icon").getAttribute("tooltiptext"),
+      gNavigatorBundle.getString("identity.notSecure.tooltip"),
+      "The insecure lock icon has a correct tooltip text."
+    );
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_insecure() {
+  await insecureTest(true);
+  await insecureTest(false);
+});
+
+async function addonsTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+
+  let newTab = await loadNewTab("about:addons");
+  is(getIdentityMode(), "chromeUI", "Identity should be chrome");
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(getIdentityMode(), "chromeUI", "Identity should be chrome");
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_addons() {
+  await addonsTest(true);
+  await addonsTest(false);
+});
+
+async function fileTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  let fileURI = getTestFilePath("");
+
+  let newTab = await loadNewTab(fileURI);
+  is(getConnectionState(), "file", "Connection should be file");
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(getConnectionState(), "file", "Connection should be file");
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_file() {
+  await fileTest(true);
+  await fileTest(false);
+});
+
+async function resourceUriTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  let dataURI = "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+  let newTab = await loadNewTab(dataURI);
+
+  is(getConnectionState(), "file", "Connection should be file");
+
+  gBrowser.selectedTab = oldTab;
+  is(
+    getIdentityMode(),
+    "localResource",
+    "Identity should be a local a resource"
+  );
+
+  gBrowser.selectedTab = newTab;
+  is(getConnectionState(), "file", "Connection should be file");
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_resource_uri() {
+  await resourceUriTest(true);
+  await resourceUriTest(false);
+});
+
+async function noCertErrorTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  let newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+
+  let promise = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
+  BrowserTestUtils.loadURIString(gBrowser, "https://nocert.example.com/");
+  await promise;
+  is(
+    getIdentityMode(),
+    "certErrorPage notSecureText",
+    "Identity should be the cert error page."
+  );
+  is(
+    getConnectionState(),
+    "cert-error-page",
+    "Connection should be the cert error page."
+  );
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(
+    getIdentityMode(),
+    "certErrorPage notSecureText",
+    "Identity should be the cert error page."
+  );
+  is(
+    getConnectionState(),
+    "cert-error-page",
+    "Connection should be the cert error page."
+  );
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_about_net_error_uri() {
+  await noCertErrorTest(true);
+  await noCertErrorTest(false);
+});
+
+add_task(async function httpsOnlyErrorTest() {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.security.https_only_mode", true]],
+  });
+  let newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+
+  let promise = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  BrowserTestUtils.loadURIString(gBrowser, "http://nocert.example.com/");
+  await promise;
+  is(
+    getIdentityMode(),
+    "httpsOnlyErrorPage",
+    "Identity should be the https-only mode error page."
+  );
+  is(
+    getConnectionState(),
+    "https-only-error-page",
+    "Connection should be the https-only mode error page."
+  );
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(
+    getIdentityMode(),
+    "httpsOnlyErrorPage",
+    "Identity should be the https-only mode error page."
+  );
+  is(
+    getConnectionState(),
+    "https-only-error-page",
+    "Connection should be the https-only mode page."
+  );
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+});
+
+async function noCertErrorFromNavigationTest(secureCheck) {
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  let newTab = await loadNewTab("http://example.com/" + DUMMY);
+
+  let promise = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    content.document.getElementById("no-cert").click();
+  });
+  await promise;
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], function () {
+    is(
+      content.window.location.href,
+      "https://nocert.example.com/",
+      "Should be the cert error URL"
+    );
+  });
+
+  is(
+    newTab.linkedBrowser.documentURI.spec.startsWith("about:certerror?"),
+    true,
+    "Should be an about:certerror"
+  );
+  is(
+    getIdentityMode(),
+    "certErrorPage notSecureText",
+    "Identity should be the cert error page."
+  );
+  is(
+    getConnectionState(),
+    "cert-error-page",
+    "Connection should be the cert error page."
+  );
+
+  gBrowser.removeTab(newTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_about_net_error_uri_from_navigation_tab() {
+  await noCertErrorFromNavigationTest(true);
+  await noCertErrorFromNavigationTest(false);
+});
+
+add_task(async function tlsErrorPageTest() {
+  const TLS10_PAGE = "https://tls1.example.com/";
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["security.tls.version.min", 3],
+      ["security.tls.version.max", 4],
+    ],
+  });
+
+  let browser;
+  let pageLoaded;
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    () => {
+      gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, TLS10_PAGE);
+      browser = gBrowser.selectedBrowser;
+      pageLoaded = BrowserTestUtils.waitForErrorPage(browser);
+    },
+    false
+  );
+
+  info("Loading and waiting for the net error");
+  await pageLoaded;
+
+  await SpecialPowers.spawn(browser, [], function () {
+    const doc = content.document;
+    ok(
+      doc.documentURI.startsWith("about:neterror"),
+      "Should be showing error page"
+    );
+  });
+
+  is(
+    getConnectionState(),
+    "cert-error-page",
+    "Connection state should be the cert error page."
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  await SpecialPowers.popPrefEnv();
+});
+
+add_task(async function netErrorPageTest() {
+  // Connect to a server that rejects all requests, to test network error pages:
+  let { HttpServer } = ChromeUtils.import("resource://testing-common/httpd.js");
+  let server = new HttpServer();
+  server.registerPrefixHandler("/", (req, res) =>
+    res.abort(new Error("Noooope."))
+  );
+  server.start(-1);
+  let port = server.identity.primaryPort;
+  const ERROR_PAGE = `http://localhost:${port}/`;
+
+  let browser;
+  let pageLoaded;
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    () => {
+      gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, ERROR_PAGE);
+      browser = gBrowser.selectedBrowser;
+      pageLoaded = BrowserTestUtils.waitForErrorPage(browser);
+    },
+    false
+  );
+
+  info("Loading and waiting for the net error");
+  await pageLoaded;
+
+  await SpecialPowers.spawn(browser, [], function () {
+    const doc = content.document;
+    ok(
+      doc.documentURI.startsWith("about:neterror"),
+      "Should be showing error page"
+    );
+  });
+
+  is(
+    getConnectionState(),
+    "net-error-page",
+    "Connection should be the net error page."
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
+
+async function aboutBlockedTest(secureCheck) {
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  let url = "http://www.itisatrap.org/firefox/its-an-attack.html";
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [INSECURE_ICON_PREF, secureCheck],
+      ["urlclassifier.blockedTable", "moztest-block-simple"],
+    ],
+  });
+  let newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+
+  BrowserTestUtils.loadURIString(gBrowser.selectedBrowser, url);
+
+  await BrowserTestUtils.browserLoaded(
+    gBrowser.selectedBrowser,
+    false,
+    url,
+    true
+  );
+
+  is(getIdentityMode(), "unknownIdentity", "Identity should be unknown.");
+  is(getConnectionState(), "not-secure", "Connection should be not secure.");
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(getIdentityMode(), "unknownIdentity", "Identity should be unknown.");
+  is(getConnectionState(), "not-secure", "Connection should be not secure.");
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_about_blocked() {
+  await aboutBlockedTest(true);
+  await aboutBlockedTest(false);
+});
+
+add_task(async function noCertErrorSecurityConnectionBGTest() {
+  let tab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = tab;
+  let promise = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
+  BrowserTestUtils.loadURIString(gBrowser, "https://nocert.example.com/");
+  await promise;
+
+  is(
+    getSecurityConnectionBG(),
+    `url("chrome://global/skin/icons/security-warning.svg")`,
+    "Security connection should show a warning lock icon."
+  );
+
+  BrowserTestUtils.removeTab(tab);
+});
+
+async function aboutUriTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  let aboutURI = "about:robots";
+
+  let newTab = await loadNewTab(aboutURI);
+  is(getConnectionState(), "file", "Connection should be file");
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  is(getConnectionState(), "file", "Connection should be file");
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_about_uri() {
+  await aboutUriTest(true);
+  await aboutUriTest(false);
+});
+
+async function readerUriTest(secureCheck) {
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+
+  let newTab = await loadNewTab("about:reader?url=http://example.com");
+  gBrowser.selectedTab = newTab;
+  let readerURL = await getReaderModeURL();
+  is(
+    readerURL,
+    "Site information for example.com",
+    "should be the correct URI in reader mode"
+  );
+
+  gBrowser.removeTab(newTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_reader_uri() {
+  await readerUriTest(true);
+  await readerUriTest(false);
+});
+
+async function dataUriTest(secureCheck) {
+  let oldTab = await loadNewTab("about:robots");
+  await SpecialPowers.pushPrefEnv({ set: [[INSECURE_ICON_PREF, secureCheck]] });
+  let dataURI = "data:text/html,hi";
+
+  let newTab = await loadNewTab(dataURI);
+  if (secureCheck) {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.selectedTab = oldTab;
+  is(getIdentityMode(), "localResource", "Identity should be localResource");
+
+  gBrowser.selectedTab = newTab;
+  if (secureCheck) {
+    is(getIdentityMode(), "notSecure", "Identity should be not secure");
+  } else {
+    is(getIdentityMode(), "unknownIdentity", "Identity should be unknown");
+  }
+
+  gBrowser.removeTab(newTab);
+  gBrowser.removeTab(oldTab);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_data_uri() {
+  await dataUriTest(true);
+  await dataUriTest(false);
+});
+
+async function pbModeTest(prefs, secureCheck) {
+  await SpecialPowers.pushPrefEnv({ set: prefs });
+
+  let privateWin = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+  let oldTab = await BrowserTestUtils.openNewForegroundTab(
+    privateWin.gBrowser,
+    "about:robots"
+  );
+  let newTab = await BrowserTestUtils.openNewForegroundTab(
+    privateWin.gBrowser,
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.com/" + DUMMY
+  );
+
+  if (secureCheck) {
+    is(
+      getIdentityMode(privateWin),
+      "notSecure",
+      "Identity should be not secure"
+    );
+  } else {
+    is(
+      getIdentityMode(privateWin),
+      "unknownIdentity",
+      "Identity should be unknown"
+    );
+  }
+
+  privateWin.gBrowser.selectedTab = oldTab;
+  is(
+    getIdentityMode(privateWin),
+    "localResource",
+    "Identity should be localResource"
+  );
+
+  privateWin.gBrowser.selectedTab = newTab;
+  if (secureCheck) {
+    is(
+      getIdentityMode(privateWin),
+      "notSecure",
+      "Identity should be not secure"
+    );
+  } else {
+    is(
+      getIdentityMode(privateWin),
+      "unknownIdentity",
+      "Identity should be unknown"
+    );
+  }
+
+  await BrowserTestUtils.closeWindow(privateWin);
+
+  await SpecialPowers.popPrefEnv();
+}
+
+add_task(async function test_pb_mode() {
+  let prefs = [
+    [INSECURE_ICON_PREF, true],
+    [INSECURE_PBMODE_ICON_PREF, true],
+    [HTTPS_FIRST_PBM_PREF, false],
+  ];
+  await pbModeTest(prefs, true);
+  prefs = [
+    [INSECURE_ICON_PREF, false],
+    [INSECURE_PBMODE_ICON_PREF, true],
+    [HTTPS_FIRST_PBM_PREF, false],
+  ];
+  await pbModeTest(prefs, true);
+  prefs = [
+    [INSECURE_ICON_PREF, false],
+    [INSECURE_PBMODE_ICON_PREF, false],
+    [HTTPS_FIRST_PBM_PREF, false],
+  ];
+  await pbModeTest(prefs, false);
+});
diff --git a/browser/base/content/test/siteIdentity/browser_check_identity_state_pdf.js b/browser/base/content/test/siteIdentity/browser_check_identity_state_pdf.js
new file mode 100644
index 0000000000..8180238e84
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_check_identity_state_pdf.js
@@ -0,0 +1,77 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests that sites opened via the PDF viewer have the correct identity state.
+ */
+
+"use strict";
+
+function testIdentityMode(uri, expectedState, message) {
+  return BrowserTestUtils.withNewTab(uri, () => {
+    is(getIdentityMode(), expectedState, message);
+  });
+}
+
+/**
+ * Test site identity state for PDFs served via file URI.
+ */
+add_task(async function test_pdf_fileURI() {
+  let path = getTestFilePath("./file_pdf.pdf");
+  info("path:" + path);
+
+  await testIdentityMode(
+    path,
+    "localResource",
+    "Identity should be localResource for a PDF served via file URI"
+  );
+});
+
+/**
+ * Test site identity state for PDFs served via blob URI.
+ */
+add_task(async function test_pdf_blobURI() {
+  let uri =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.com"
+    ) + "file_pdf_blob.html";
+
+  await BrowserTestUtils.withNewTab(uri, async browser => {
+    let newTabOpened = BrowserTestUtils.waitForNewTab(gBrowser, null, true);
+
+    await BrowserTestUtils.synthesizeMouseAtCenter("a", {}, browser);
+    await newTabOpened;
+
+    is(
+      getIdentityMode(),
+      "localResource",
+      "Identity should be localResource for a PDF served via blob URI"
+    );
+
+    BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  });
+});
+
+/**
+ * Test site identity state for PDFs served via HTTP.
+ */
+add_task(async function test_pdf_http() {
+  const PDF_URI_NOSCHEME =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "example.com"
+    ) + "file_pdf.pdf";
+
+  await testIdentityMode(
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://" + PDF_URI_NOSCHEME,
+    "notSecure",
+    "Identity should be notSecure for a PDF served via HTTP."
+  );
+  await testIdentityMode(
+    "https://" + PDF_URI_NOSCHEME,
+    "verifiedDomain",
+    "Identity should be verifiedDomain for a PDF served via HTTPS."
+  );
+});
diff --git a/browser/base/content/test/siteIdentity/browser_csp_block_all_mixedcontent.js b/browser/base/content/test/siteIdentity/browser_csp_block_all_mixedcontent.js
new file mode 100644
index 0000000000..693c9418de
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_csp_block_all_mixedcontent.js
@@ -0,0 +1,60 @@
+/*
+ * Description of the Test:
+ * We load an https page which uses a CSP including block-all-mixed-content.
+ * The page tries to load a script over http. We make sure the UI is not
+ * influenced when blocking the mixed content. In particular the page
+ * should still appear fully encrypted with a green lock.
+ */
+
+const PRE_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+var gTestBrowser = null;
+
+// ------------------------------------------------------
+function cleanUpAfterTests() {
+  gBrowser.removeCurrentTab();
+  window.focus();
+  finish();
+}
+
+// ------------------------------------------------------
+async function verifyUInotDegraded() {
+  // make sure that not mixed content is loaded and also not blocked
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: false,
+    passiveLoaded: false,
+  });
+  // clean up and finish test
+  cleanUpAfterTests();
+}
+
+// ------------------------------------------------------
+function runTests() {
+  var newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+  gTestBrowser = gBrowser.selectedBrowser;
+  newTab.linkedBrowser.stop();
+
+  // Starting the test
+  var url = PRE_PATH + "file_csp_block_all_mixedcontent.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    verifyUInotDegraded
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+// ------------------------------------------------------
+function test() {
+  // Performing async calls, e.g. 'onload', we have to wait till all of them finished
+  waitForExplicitFinish();
+
+  SpecialPowers.pushPrefEnv(
+    { set: [["security.mixed_content.block_active_content", true]] },
+    function () {
+      runTests();
+    }
+  );
+}
diff --git a/browser/base/content/test/siteIdentity/browser_deprecatedTLSVersions.js b/browser/base/content/test/siteIdentity/browser_deprecatedTLSVersions.js
new file mode 100644
index 0000000000..22fa33f3c2
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_deprecatedTLSVersions.js
@@ -0,0 +1,94 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Tests for Bug 1535210 - Set SSL STATE_IS_BROKEN flag for TLS1.0 and TLS 1.1 connections
+ */
+
+const HTTPS_TLS1_0 = "https://tls1.example.com";
+const HTTPS_TLS1_1 = "https://tls11.example.com";
+const HTTPS_TLS1_2 = "https://tls12.example.com";
+const HTTPS_TLS1_3 = "https://tls13.example.com";
+
+function getIdentityMode(aWindow = window) {
+  return aWindow.document.getElementById("identity-box").className;
+}
+
+function closeIdentityPopup() {
+  let promise = BrowserTestUtils.waitForEvent(
+    gIdentityHandler._identityPopup,
+    "popuphidden"
+  );
+  gIdentityHandler._identityPopup.hidePopup();
+  return promise;
+}
+
+async function checkConnectionState(state) {
+  await openIdentityPopup();
+  is(getConnectionState(), state, "connectionState should be " + state);
+  await closeIdentityPopup();
+}
+
+function getConnectionState() {
+  return document.getElementById("identity-popup").getAttribute("connection");
+}
+
+registerCleanupFunction(function () {
+  // Set preferences back to their original values
+  Services.prefs.clearUserPref("security.tls.version.min");
+  Services.prefs.clearUserPref("security.tls.version.max");
+});
+
+add_task(async function () {
+  // Run with all versions enabled for this test.
+  Services.prefs.setIntPref("security.tls.version.min", 1);
+  Services.prefs.setIntPref("security.tls.version.max", 4);
+
+  await BrowserTestUtils.withNewTab("about:blank", async function (browser) {
+    // Try deprecated versions
+    BrowserTestUtils.loadURIString(browser, HTTPS_TLS1_0);
+    await BrowserTestUtils.browserLoaded(browser);
+    isSecurityState(browser, "broken");
+    is(
+      getIdentityMode(),
+      "unknownIdentity weakCipher",
+      "Identity should be unknownIdentity"
+    );
+    await checkConnectionState("not-secure");
+
+    BrowserTestUtils.loadURIString(browser, HTTPS_TLS1_1);
+    await BrowserTestUtils.browserLoaded(browser);
+    isSecurityState(browser, "broken");
+    is(
+      getIdentityMode(),
+      "unknownIdentity weakCipher",
+      "Identity should be unknownIdentity"
+    );
+    await checkConnectionState("not-secure");
+
+    // Transition to secure
+    BrowserTestUtils.loadURIString(browser, HTTPS_TLS1_2);
+    await BrowserTestUtils.browserLoaded(browser);
+    isSecurityState(browser, "secure");
+    is(getIdentityMode(), "verifiedDomain", "Identity should be verified");
+    await checkConnectionState("secure");
+
+    // Transition back to broken
+    BrowserTestUtils.loadURIString(browser, HTTPS_TLS1_1);
+    await BrowserTestUtils.browserLoaded(browser);
+    isSecurityState(browser, "broken");
+    is(
+      getIdentityMode(),
+      "unknownIdentity weakCipher",
+      "Identity should be unknownIdentity"
+    );
+    await checkConnectionState("not-secure");
+
+    // TLS1.3 for completeness
+    BrowserTestUtils.loadURIString(browser, HTTPS_TLS1_3);
+    await BrowserTestUtils.browserLoaded(browser);
+    isSecurityState(browser, "secure");
+    is(getIdentityMode(), "verifiedDomain", "Identity should be verified");
+    await checkConnectionState("secure");
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_geolocation_indicator.js b/browser/base/content/test/siteIdentity/browser_geolocation_indicator.js
new file mode 100644
index 0000000000..078b7ab975
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_geolocation_indicator.js
@@ -0,0 +1,381 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+requestLongerTimeout(2);
+
+const { PermissionUI } = ChromeUtils.importESModule(
+  "resource:///modules/PermissionUI.sys.mjs"
+);
+
+const { PermissionTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PermissionTestUtils.sys.mjs"
+);
+
+const CP = Cc["@mozilla.org/content-pref/service;1"].getService(
+  Ci.nsIContentPrefService2
+);
+
+const EXAMPLE_PAGE_URL = "https://example.com";
+const EXAMPLE_PAGE_URI = Services.io.newURI(EXAMPLE_PAGE_URL);
+const EXAMPLE_PAGE_PRINCIPAL =
+  Services.scriptSecurityManager.createContentPrincipal(EXAMPLE_PAGE_URI, {});
+const GEO_CONTENT_PREF_KEY = "permissions.geoLocation.lastAccess";
+const POLL_INTERVAL_FALSE_STATE = 50;
+
+async function testGeoSharingIconVisible(state = true) {
+  let sharingIcon = document.getElementById("geo-sharing-icon");
+  ok(sharingIcon, "Geo sharing icon exists");
+
+  try {
+    await TestUtils.waitForCondition(
+      () => sharingIcon.hasAttribute("sharing") === true,
+      "Waiting for geo sharing icon visibility state",
+      // If we wait for sharing icon to *not* show, waitForCondition will always timeout on correct state.
+      // In these cases we want to reduce the wait time from 5 seconds to 2.5 seconds to prevent test duration timeouts
+      !state ? POLL_INTERVAL_FALSE_STATE : undefined
+    );
+  } catch (e) {
+    ok(!state, "Geo sharing icon not showing");
+    return;
+  }
+  ok(state, "Geo sharing icon showing");
+}
+
+async function checkForDOMElement(state, id) {
+  info(`Testing state ${state} of element  ${id}`);
+  let el;
+  try {
+    await TestUtils.waitForCondition(
+      () => {
+        el = document.getElementById(id);
+        return el != null;
+      },
+      `Waiting for ${id}`,
+      !state ? POLL_INTERVAL_FALSE_STATE : undefined
+    );
+  } catch (e) {
+    ok(!state, `${id} has correct state`);
+    return el;
+  }
+  ok(state, `${id} has correct state`);
+
+  return el;
+}
+
+async function testPermissionPopupGeoContainer(
+  containerVisible,
+  timestampVisible
+) {
+  // The container holds the timestamp element, therefore we can't have a
+  // visible timestamp without the container.
+  if (timestampVisible && !containerVisible) {
+    ok(false, "Can't have timestamp without container");
+  }
+
+  // Only call openPermissionPopup if popup is closed, otherwise it does not resolve
+  if (!gPermissionPanel._identityPermissionBox.hasAttribute("open")) {
+    await openPermissionPopup();
+  }
+
+  let checkContainer = checkForDOMElement(
+    containerVisible,
+    "permission-popup-geo-container"
+  );
+
+  if (containerVisible && timestampVisible) {
+    // Wait for the geo container to be fully populated.
+    // The time label is computed async.
+    let container = await checkContainer;
+    await TestUtils.waitForCondition(
+      () => container.childElementCount == 2,
+      "permission-popup-geo-container should have two elements."
+    );
+    is(
+      container.childNodes[0].classList[0],
+      "permission-popup-permission-item",
+      "Geo container should have permission item."
+    );
+    is(
+      container.childNodes[1].id,
+      "geo-access-indicator-item",
+      "Geo container should have indicator item."
+    );
+  }
+  let checkAccessIndicator = checkForDOMElement(
+    timestampVisible,
+    "geo-access-indicator-item"
+  );
+
+  return Promise.all([checkContainer, checkAccessIndicator]);
+}
+
+function openExamplePage(tabbrowser = gBrowser) {
+  return BrowserTestUtils.openNewForegroundTab(tabbrowser, EXAMPLE_PAGE_URL);
+}
+
+function requestGeoLocation(browser) {
+  return SpecialPowers.spawn(browser, [], () => {
+    return new Promise(resolve => {
+      content.navigator.geolocation.getCurrentPosition(
+        () => resolve(true),
+        error => resolve(error.code !== 1) // PERMISSION_DENIED = 1
+      );
+    });
+  });
+}
+
+function answerGeoLocationPopup(allow, remember = false) {
+  let notification = PopupNotifications.getNotification("geolocation");
+  ok(
+    PopupNotifications.isPanelOpen && notification,
+    "Geolocation notification is open"
+  );
+
+  let rememberCheck = PopupNotifications.panel.querySelector(
+    ".popup-notification-checkbox"
+  );
+  rememberCheck.checked = remember;
+
+  let popupHidden = BrowserTestUtils.waitForEvent(
+    PopupNotifications.panel,
+    "popuphidden"
+  );
+  if (allow) {
+    let allowBtn = PopupNotifications.panel.querySelector(
+      ".popup-notification-primary-button"
+    );
+    allowBtn.click();
+  } else {
+    let denyBtn = PopupNotifications.panel.querySelector(
+      ".popup-notification-secondary-button"
+    );
+    denyBtn.click();
+  }
+  return popupHidden;
+}
+
+function setGeoLastAccess(browser, state) {
+  return new Promise(resolve => {
+    let host = browser.currentURI.host;
+    let handler = {
+      handleCompletion: () => resolve(),
+    };
+
+    if (!state) {
+      CP.removeByDomainAndName(
+        host,
+        GEO_CONTENT_PREF_KEY,
+        browser.loadContext,
+        handler
+      );
+      return;
+    }
+    CP.set(
+      host,
+      GEO_CONTENT_PREF_KEY,
+      new Date().toString(),
+      browser.loadContext,
+      handler
+    );
+  });
+}
+
+async function testGeoLocationLastAccessSet(browser) {
+  let timestamp = await new Promise(resolve => {
+    let lastAccess = null;
+    CP.getByDomainAndName(
+      gBrowser.currentURI.spec,
+      GEO_CONTENT_PREF_KEY,
+      browser.loadContext,
+      {
+        handleResult(pref) {
+          lastAccess = pref.value;
+        },
+        handleCompletion() {
+          resolve(lastAccess);
+        },
+      }
+    );
+  });
+
+  ok(timestamp != null, "Geo last access timestamp set");
+
+  let parseSuccess = true;
+  try {
+    timestamp = new Date(timestamp);
+  } catch (e) {
+    parseSuccess = false;
+  }
+  ok(
+    parseSuccess && !isNaN(timestamp),
+    "Geo last access timestamp is valid Date"
+  );
+}
+
+async function cleanup(tab) {
+  await setGeoLastAccess(tab.linkedBrowser, false);
+  SitePermissions.removeFromPrincipal(
+    tab.linkedBrowser.contentPrincipal,
+    "geo",
+    tab.linkedBrowser
+  );
+  gBrowser.resetBrowserSharing(tab.linkedBrowser);
+  BrowserTestUtils.removeTab(tab);
+}
+
+async function testIndicatorGeoSharingState(active) {
+  let tab = await openExamplePage();
+  gBrowser.updateBrowserSharing(tab.linkedBrowser, { geo: active });
+  await testGeoSharingIconVisible(active);
+
+  await cleanup(tab);
+}
+
+async function testIndicatorExplicitAllow(persistent) {
+  let tab = await openExamplePage();
+
+  let popupShown = BrowserTestUtils.waitForEvent(
+    PopupNotifications.panel,
+    "popupshown"
+  );
+  info("Requesting geolocation");
+  let request = requestGeoLocation(tab.linkedBrowser);
+  await popupShown;
+  info("Allowing geolocation via popup");
+  answerGeoLocationPopup(true, persistent);
+  await request;
+
+  await Promise.all([
+    testGeoSharingIconVisible(true),
+    testPermissionPopupGeoContainer(true, true),
+    testGeoLocationLastAccessSet(tab.linkedBrowser),
+  ]);
+
+  await cleanup(tab);
+}
+
+// Indicator and permission popup entry shown after explicit PermissionUI geolocation allow
+add_task(function test_indicator_and_timestamp_after_explicit_allow() {
+  return testIndicatorExplicitAllow(false);
+});
+add_task(function test_indicator_and_timestamp_after_explicit_allow_remember() {
+  return testIndicatorExplicitAllow(true);
+});
+
+// Indicator and permission popup entry shown after auto PermissionUI geolocation allow
+add_task(async function test_indicator_and_timestamp_after_implicit_allow() {
+  PermissionTestUtils.add(
+    EXAMPLE_PAGE_URI,
+    "geo",
+    Services.perms.ALLOW_ACTION,
+    Services.perms.EXPIRE_NEVER
+  );
+  let tab = await openExamplePage();
+  let result = await requestGeoLocation(tab.linkedBrowser);
+  ok(result, "Request should be allowed");
+
+  await Promise.all([
+    testGeoSharingIconVisible(true),
+    testPermissionPopupGeoContainer(true, true),
+    testGeoLocationLastAccessSet(tab.linkedBrowser),
+  ]);
+
+  await cleanup(tab);
+});
+
+// Indicator shown when manually setting sharing state to true
+add_task(function test_indicator_sharing_state_active() {
+  return testIndicatorGeoSharingState(true);
+});
+
+// Indicator not shown when manually setting sharing state to false
+add_task(function test_indicator_sharing_state_inactive() {
+  return testIndicatorGeoSharingState(false);
+});
+
+// Permission popup shows permission if geo permission is set to persistent allow
+add_task(async function test_permission_popup_permission_scope_permanent() {
+  PermissionTestUtils.add(
+    EXAMPLE_PAGE_URI,
+    "geo",
+    Services.perms.ALLOW_ACTION,
+    Services.perms.EXPIRE_NEVER
+  );
+  let tab = await openExamplePage();
+
+  await testPermissionPopupGeoContainer(true, false); // Expect permission to be visible, but not lastAccess indicator
+
+  await cleanup(tab);
+});
+
+// Sharing state set, but no permission
+add_task(async function test_permission_popup_permission_sharing_state() {
+  let tab = await openExamplePage();
+  gBrowser.updateBrowserSharing(tab.linkedBrowser, { geo: true });
+  await testPermissionPopupGeoContainer(true, false);
+
+  await cleanup(tab);
+});
+
+// Permission popup has correct state if sharing state and last geo access timestamp are set
+add_task(
+  async function test_permission_popup_permission_sharing_state_timestamp() {
+    let tab = await openExamplePage();
+    gBrowser.updateBrowserSharing(tab.linkedBrowser, { geo: true });
+    await setGeoLastAccess(tab.linkedBrowser, true);
+
+    await testPermissionPopupGeoContainer(true, true);
+
+    await cleanup(tab);
+  }
+);
+
+// Clicking permission clear button clears permission and resets geo sharing state
+add_task(async function test_permission_popup_permission_clear() {
+  PermissionTestUtils.add(
+    EXAMPLE_PAGE_URI,
+    "geo",
+    Services.perms.ALLOW_ACTION,
+    Services.perms.EXPIRE_NEVER
+  );
+  let tab = await openExamplePage();
+  gBrowser.updateBrowserSharing(tab.linkedBrowser, { geo: true });
+
+  await openPermissionPopup();
+
+  let clearButton = document.querySelector(
+    "#permission-popup-geo-container button"
+  );
+  ok(clearButton, "Clear button is visible");
+  clearButton.click();
+
+  await Promise.all([
+    testGeoSharingIconVisible(false),
+    testPermissionPopupGeoContainer(false, false),
+    TestUtils.waitForCondition(() => {
+      let sharingState = tab._sharingState;
+      return (
+        sharingState == null ||
+        sharingState.geo == null ||
+        sharingState.geo === false
+      );
+    }, "Waiting for geo sharing state to reset"),
+  ]);
+  await cleanup(tab);
+});
+
+/**
+ * Tests that we only show the last access label once when the sharing
+ * state is updated multiple times while the popup is open.
+ */
+add_task(async function test_permission_no_duplicate_last_access_label() {
+  let tab = await openExamplePage();
+  await setGeoLastAccess(tab.linkedBrowser, true);
+  await openPermissionPopup();
+  gBrowser.updateBrowserSharing(tab.linkedBrowser, { geo: true });
+  gBrowser.updateBrowserSharing(tab.linkedBrowser, { geo: true });
+  await testPermissionPopupGeoContainer(true, true);
+  await cleanup(tab);
+});
diff --git a/browser/base/content/test/siteIdentity/browser_getSecurityInfo.js b/browser/base/content/test/siteIdentity/browser_getSecurityInfo.js
new file mode 100644
index 0000000000..b3b086f39d
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_getSecurityInfo.js
@@ -0,0 +1,35 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const MOZILLA_PKIX_ERROR_BASE = Ci.nsINSSErrorsService.MOZILLA_PKIX_ERROR_BASE;
+const MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT = MOZILLA_PKIX_ERROR_BASE + 14;
+
+add_task(async function test() {
+  await BrowserTestUtils.withNewTab("about:blank", async function (browser) {
+    let loaded = BrowserTestUtils.waitForErrorPage(browser);
+    BrowserTestUtils.loadURIString(browser, "https://self-signed.example.com");
+    await loaded;
+    let securityInfo = gBrowser.securityUI.secInfo;
+    ok(!securityInfo, "Found no security info");
+
+    loaded = BrowserTestUtils.browserLoaded(browser);
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    BrowserTestUtils.loadURIString(browser, "http://example.com");
+    await loaded;
+    securityInfo = gBrowser.securityUI.secInfo;
+    ok(!securityInfo, "Found no security info");
+
+    loaded = BrowserTestUtils.browserLoaded(browser);
+    BrowserTestUtils.loadURIString(browser, "https://example.com");
+    await loaded;
+    securityInfo = gBrowser.securityUI.secInfo;
+    ok(securityInfo, "Found some security info");
+    ok(securityInfo.succeededCertChain, "Has a succeeded cert chain");
+    is(securityInfo.errorCode, 0, "Has no error code");
+    is(
+      securityInfo.serverCert.commonName,
+      "example.com",
+      "Has the correct certificate"
+    );
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityBlock_flicker.js b/browser/base/content/test/siteIdentity/browser_identityBlock_flicker.js
new file mode 100644
index 0000000000..de2a137100
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityBlock_flicker.js
@@ -0,0 +1,52 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* Tests that the identity icons don't flicker when navigating,
+ * i.e. the box should show no intermediate identity state. */
+
+add_task(async function test() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:robots",
+    true
+  );
+  let identityBox = document.getElementById("identity-box");
+
+  is(
+    identityBox.className,
+    "localResource",
+    "identity box has the correct class"
+  );
+
+  let observerOptions = {
+    attributes: true,
+    attributeFilter: ["class"],
+  };
+  let classChanges = 0;
+
+  let observer = new MutationObserver(function (mutations) {
+    for (let mutation of mutations) {
+      is(mutation.type, "attributes");
+      is(mutation.attributeName, "class");
+      classChanges++;
+      is(
+        identityBox.className,
+        "verifiedDomain",
+        "identity box class changed correctly"
+      );
+    }
+  });
+  observer.observe(identityBox, observerOptions);
+
+  let loaded = BrowserTestUtils.browserLoaded(
+    tab.linkedBrowser,
+    false,
+    "https://example.com/"
+  );
+  BrowserTestUtils.loadURIString(tab.linkedBrowser, "https://example.com");
+  await loaded;
+
+  is(classChanges, 1, "Changed the className once");
+  observer.disconnect();
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityBlock_focus.js b/browser/base/content/test/siteIdentity/browser_identityBlock_focus.js
new file mode 100644
index 0000000000..858cd3d632
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityBlock_focus.js
@@ -0,0 +1,126 @@
+/* Tests that the identity block can be reached via keyboard
+ * shortcuts and that it has the correct tab order.
+ */
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+const PERMISSIONS_PAGE = TEST_PATH + "permissions.html";
+
+// The DevEdition has the DevTools button in the toolbar by default. Remove it
+// to prevent branch-specific rules what button should be focused.
+CustomizableUI.removeWidgetFromArea("developer-button");
+
+registerCleanupFunction(async function resetToolbar() {
+  await CustomizableUI.reset();
+});
+
+add_task(async function setupHomeButton() {
+  // Put the home button in the pre-proton placement to test focus states.
+  CustomizableUI.addWidgetToArea(
+    "home-button",
+    "nav-bar",
+    CustomizableUI.getPlacementOfWidget("stop-reload-button").position + 1
+  );
+});
+
+function synthesizeKeyAndWaitForFocus(element, keyCode, options) {
+  let focused = BrowserTestUtils.waitForEvent(element, "focus");
+  EventUtils.synthesizeKey(keyCode, options);
+  return focused;
+}
+
+// Checks that the tracking protection icon container is the next element after
+// the urlbar to be focused if there are no active notification anchors.
+add_task(async function testWithoutNotifications() {
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await BrowserTestUtils.withNewTab("https://example.com", async function () {
+    await synthesizeKeyAndWaitForFocus(gURLBar, "l", { accelKey: true });
+    is(document.activeElement, gURLBar.inputField, "urlbar should be focused");
+    await synthesizeKeyAndWaitForFocus(
+      gProtectionsHandler._trackingProtectionIconContainer,
+      "VK_TAB",
+      { shiftKey: true }
+    );
+    is(
+      document.activeElement,
+      gProtectionsHandler._trackingProtectionIconContainer,
+      "tracking protection icon container should be focused"
+    );
+  });
+});
+
+// Checks that when there is a notification anchor, it will receive
+// focus before the identity block.
+add_task(async function testWithNotifications() {
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await BrowserTestUtils.withNewTab(PERMISSIONS_PAGE, async function (browser) {
+    let popupshown = BrowserTestUtils.waitForEvent(
+      PopupNotifications.panel,
+      "popupshown"
+    );
+    // Request a permission;
+    BrowserTestUtils.synthesizeMouseAtCenter("#geo", {}, browser);
+    await popupshown;
+
+    await synthesizeKeyAndWaitForFocus(gURLBar, "l", { accelKey: true });
+    is(document.activeElement, gURLBar.inputField, "urlbar should be focused");
+    await synthesizeKeyAndWaitForFocus(
+      gProtectionsHandler._trackingProtectionIconContainer,
+      "VK_TAB",
+      { shiftKey: true }
+    );
+    is(
+      document.activeElement,
+      gProtectionsHandler._trackingProtectionIconContainer,
+      "tracking protection icon container should be focused"
+    );
+    await synthesizeKeyAndWaitForFocus(
+      gIdentityHandler._identityIconBox,
+      "ArrowRight"
+    );
+    is(
+      document.activeElement,
+      gIdentityHandler._identityIconBox,
+      "identity block should be focused"
+    );
+    let geoIcon = document.getElementById("geo-notification-icon");
+    await synthesizeKeyAndWaitForFocus(geoIcon, "ArrowRight");
+    is(
+      document.activeElement,
+      geoIcon,
+      "notification anchor should be focused"
+    );
+  });
+});
+
+// Checks that with invalid pageproxystate the identity block is ignored.
+add_task(async function testInvalidPageProxyState() {
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await BrowserTestUtils.withNewTab("about:blank", async function (browser) {
+    // Loading about:blank will automatically focus the urlbar, which, however, can
+    // race with the test code. So we only send the shortcut if the urlbar isn't focused yet.
+    if (document.activeElement != gURLBar.inputField) {
+      await synthesizeKeyAndWaitForFocus(gURLBar, "l", { accelKey: true });
+    }
+    is(document.activeElement, gURLBar.inputField, "urlbar should be focused");
+    await synthesizeKeyAndWaitForFocus(
+      document.getElementById("home-button"),
+      "VK_TAB",
+      { shiftKey: true }
+    );
+    await synthesizeKeyAndWaitForFocus(
+      document.getElementById("tabs-newtab-button"),
+      "VK_TAB",
+      { shiftKey: true }
+    );
+    isnot(
+      document.activeElement,
+      gProtectionsHandler._trackingProtectionIconContainer,
+      "tracking protection icon container should not be focused"
+    );
+    // Restore focus to the url bar.
+    gURLBar.focus();
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityIcon_img_url.js b/browser/base/content/test/siteIdentity/browser_identityIcon_img_url.js
new file mode 100644
index 0000000000..9ef8b6dfed
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityIcon_img_url.js
@@ -0,0 +1,148 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+/**
+ * Test Bug 1562881 - Ensuring the identity icon loads correct img in different
+ *                    circumstances.
+ */
+
+const kBaseURI = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+
+const kBaseURILocalhost = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "http://127.0.0.1"
+);
+
+const TEST_CASES = [
+  {
+    type: "http",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    testURL: "http://example.com",
+    img_url: `url("chrome://global/skin/icons/security-broken.svg")`,
+  },
+  {
+    type: "https",
+    testURL: "https://example.com",
+    img_url: `url("chrome://global/skin/icons/security.svg")`,
+  },
+  {
+    type: "non-chrome about page",
+    testURL: "about:about",
+    img_url: `url("chrome://global/skin/icons/page-portrait.svg")`,
+  },
+  {
+    type: "chrome about page",
+    testURL: "about:preferences",
+    img_url: `url("chrome://branding/content/icon${
+      window.devicePixelRatio > 1 ? 32 : 16
+    }.png")`,
+  },
+  {
+    type: "file",
+    testURL: "dummy_page.html",
+    img_url: `url("chrome://global/skin/icons/page-portrait.svg")`,
+  },
+  {
+    type: "resource",
+    testURL: "resource://gre/modules/Log.sys.mjs",
+    img_url: `url("chrome://global/skin/icons/page-portrait.svg")`,
+  },
+  {
+    type: "mixedPassiveContent",
+    testURL: kBaseURI + "file_mixedPassiveContent.html",
+    img_url: `url("chrome://global/skin/icons/security-warning.svg")`,
+  },
+  {
+    type: "mixedActiveContent",
+    testURL: kBaseURI + "file_csp_block_all_mixedcontent.html",
+    img_url: `url("chrome://global/skin/icons/security.svg")`,
+  },
+  {
+    type: "certificateError",
+    testURL: "https://self-signed.example.com",
+    img_url: `url("chrome://global/skin/icons/security-warning.svg")`,
+  },
+  {
+    type: "localhost",
+    testURL: "http://127.0.0.1",
+    img_url: `url("chrome://global/skin/icons/page-portrait.svg")`,
+  },
+  {
+    type: "localhost + http frame",
+    testURL: kBaseURILocalhost + "file_csp_block_all_mixedcontent.html",
+    img_url: `url("chrome://global/skin/icons/page-portrait.svg")`,
+  },
+  {
+    type: "data URI",
+    testURL: "data:text/html,<div>",
+    img_url: `url("chrome://global/skin/icons/security-broken.svg")`,
+  },
+  {
+    type: "view-source HTTP",
+    testURL: "view-source:http://example.com/",
+    img_url: `url("chrome://global/skin/icons/security-broken.svg")`,
+  },
+  {
+    type: "view-source HTTPS",
+    testURL: "view-source:https://example.com/",
+    img_url: `url("chrome://global/skin/icons/security.svg")`,
+  },
+];
+
+add_task(async function test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      // By default, proxies don't apply to 127.0.0.1. We need them to for this test, though:
+      ["network.proxy.allow_hijacking_localhost", true],
+      ["security.mixed_content.upgrade_display_content", false],
+    ],
+  });
+
+  for (let testData of TEST_CASES) {
+    info(`Testing for ${testData.type}`);
+    // Open the page for testing.
+    let testURL = testData.testURL;
+
+    // Overwrite the url if it is testing the file url.
+    if (testData.type === "file") {
+      let dir = getChromeDir(getResolvedURI(gTestPath));
+      dir.append(testURL);
+      dir.normalize();
+      testURL = Services.io.newFileURI(dir).spec;
+    }
+
+    let pageLoaded;
+    let tab = await BrowserTestUtils.openNewForegroundTab(
+      gBrowser,
+      () => {
+        gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, testURL);
+        let browser = gBrowser.selectedBrowser;
+        if (testData.type === "certificateError") {
+          pageLoaded = BrowserTestUtils.waitForErrorPage(browser);
+        } else {
+          pageLoaded = BrowserTestUtils.browserLoaded(browser);
+        }
+      },
+      false
+    );
+    await pageLoaded;
+
+    let identityIcon = document.getElementById("identity-icon");
+
+    // Get the image url from the identity icon.
+    let identityIconImageURL = gBrowser.ownerGlobal
+      .getComputedStyle(identityIcon)
+      .getPropertyValue("list-style-image");
+
+    is(
+      identityIconImageURL,
+      testData.img_url,
+      "The identity icon has a correct image url."
+    );
+
+    BrowserTestUtils.removeTab(tab);
+  }
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityPopup_HttpsOnlyMode.js b/browser/base/content/test/siteIdentity/browser_identityPopup_HttpsOnlyMode.js
new file mode 100644
index 0000000000..a83f38e1f6
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityPopup_HttpsOnlyMode.js
@@ -0,0 +1,191 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const HTTPS_ONLY_PERMISSION = "https-only-load-insecure";
+const WEBSITE = scheme => `${scheme}://example.com`;
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.security.https_only_mode", true]],
+  });
+
+  // Site is already HTTPS, so the UI should not be visible.
+  await runTest({
+    name: "No HTTPS-Only UI",
+    initialScheme: "https",
+    initialPermission: 0,
+    permissionScheme: "https",
+    isUiVisible: false,
+  });
+
+  // Site gets upgraded to HTTPS, so the UI should be visible.
+  // Disabling HTTPS-Only Mode through the menulist should reload the page and
+  // set the permission accordingly.
+  await runTest({
+    name: "Disable HTTPS-Only",
+    initialScheme: "http",
+    initialPermission: 0,
+    permissionScheme: "https",
+    isUiVisible: true,
+    selectPermission: 1,
+    expectReload: true,
+    finalScheme: "https",
+  });
+
+  // HTTPS-Only Mode is disabled for this site, so the UI should be visible.
+  // Disabling HTTPS-Only Mode through the menulist should not reload the page
+  // but set the permission accordingly.
+  await runTest({
+    name: "Switch between off states",
+    initialScheme: "http",
+    initialPermission: 1,
+    permissionScheme: "http",
+    isUiVisible: true,
+    selectPermission: 2,
+    expectReload: false,
+    finalScheme: "http",
+  });
+
+  // HTTPS-Only Mode is disabled for this site, so the UI should be visible.
+  // Enabling HTTPS-Only Mode through the menulist should reload and upgrade the
+  // page and set the permission accordingly.
+  await runTest({
+    name: "Enable HTTPS-Only again",
+    initialScheme: "http",
+    initialPermission: 2,
+    permissionScheme: "http",
+    isUiVisible: true,
+    selectPermission: 0,
+    expectReload: true,
+    finalScheme: "https",
+  });
+});
+
+async function runTest(options) {
+  // Set the initial permission
+  setPermission(WEBSITE(options.permissionScheme), options.initialPermission);
+
+  await BrowserTestUtils.withNewTab(
+    WEBSITE(options.initialScheme),
+    async function (browser) {
+      const name = options.name + " | ";
+
+      // Check if the site has the expected scheme
+      is(
+        browser.currentURI.scheme,
+        options.permissionScheme,
+        name + "Expected scheme should match actual scheme"
+      );
+
+      // Open the identity popup.
+      let { gIdentityHandler } = gBrowser.ownerGlobal;
+      let promisePanelOpen = BrowserTestUtils.waitForEvent(
+        gBrowser.ownerGlobal,
+        "popupshown",
+        true,
+        event => event.target == gIdentityHandler._identityPopup
+      );
+      gIdentityHandler._identityIconBox.click();
+      await promisePanelOpen;
+
+      // Check if the HTTPS-Only UI is visible
+      const httpsOnlyUI = document.getElementById(
+        "identity-popup-security-httpsonlymode"
+      );
+      is(
+        gBrowser.ownerGlobal.getComputedStyle(httpsOnlyUI).display != "none",
+        options.isUiVisible,
+        options.isUiVisible
+          ? name + "HTTPS-Only UI should be visible."
+          : name + "HTTPS-Only UI shouldn't be visible."
+      );
+
+      // If it's not visible we can't do much else :)
+      if (!options.isUiVisible) {
+        return;
+      }
+
+      // Check if the value of the menulist matches the initial permission
+      const httpsOnlyMenulist = document.getElementById(
+        "identity-popup-security-httpsonlymode-menulist"
+      );
+      is(
+        parseInt(httpsOnlyMenulist.value, 10),
+        options.initialPermission,
+        name + "Menulist value should match expected permission value."
+      );
+
+      // Select another HTTPS-Only state and potentially wait for the page to reload
+      if (options.expectReload) {
+        const loaded = BrowserTestUtils.browserLoaded(browser);
+        httpsOnlyMenulist.getItemAtIndex(options.selectPermission).doCommand();
+        await loaded;
+      } else {
+        httpsOnlyMenulist.getItemAtIndex(options.selectPermission).doCommand();
+      }
+
+      // Check if the site has the expected scheme
+      is(
+        browser.currentURI.scheme,
+        options.finalScheme,
+        name + "Unexpected scheme after page reloaded."
+      );
+
+      // Check if the permission was sucessfully changed
+      is(
+        getPermission(WEBSITE(options.permissionScheme)),
+        options.selectPermission,
+        name + "Set permission should match the one selected from the menulist."
+      );
+    }
+  );
+
+  // Reset permission
+  Services.perms.removeAll();
+}
+
+function setPermission(url, newValue) {
+  let uri = Services.io.newURI(url);
+  let principal = Services.scriptSecurityManager.createContentPrincipal(
+    uri,
+    {}
+  );
+  if (newValue === 0) {
+    Services.perms.removeFromPrincipal(principal, HTTPS_ONLY_PERMISSION);
+  } else if (newValue === 1) {
+    Services.perms.addFromPrincipal(
+      principal,
+      HTTPS_ONLY_PERMISSION,
+      Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW,
+      Ci.nsIPermissionManager.EXPIRE_NEVER
+    );
+  } else {
+    Services.perms.addFromPrincipal(
+      principal,
+      HTTPS_ONLY_PERMISSION,
+      Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW_SESSION,
+      Ci.nsIPermissionManager.EXPIRE_SESSION
+    );
+  }
+}
+
+function getPermission(url) {
+  let uri = Services.io.newURI(url);
+  let principal = Services.scriptSecurityManager.createContentPrincipal(
+    uri,
+    {}
+  );
+  const state = Services.perms.testPermissionFromPrincipal(
+    principal,
+    HTTPS_ONLY_PERMISSION
+  );
+  switch (state) {
+    case Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW_SESSION:
+      return 2; // Off temporarily
+    case Ci.nsIHttpsOnlyModePermission.LOAD_INSECURE_ALLOW:
+      return 1; // Off
+    default:
+      return 0; // On
+  }
+}
diff --git a/browser/base/content/test/siteIdentity/browser_identityPopup_clearSiteData.js b/browser/base/content/test/siteIdentity/browser_identityPopup_clearSiteData.js
new file mode 100644
index 0000000000..efc4f34310
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityPopup_clearSiteData.js
@@ -0,0 +1,245 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_ORIGIN = "https://example.com";
+const TEST_SUB_ORIGIN = "https://test1.example.com";
+const TEST_ORIGIN_2 = "https://example.net";
+const REMOVE_DIALOG_URL =
+  "chrome://browser/content/preferences/dialogs/siteDataRemoveSelected.xhtml";
+
+// Greek IDN for 'example.test'.
+const TEST_IDN_ORIGIN =
+  "https://\u03C0\u03B1\u03C1\u03AC\u03B4\u03B5\u03B9\u03B3\u03BC\u03B1.\u03B4\u03BF\u03BA\u03B9\u03BC\u03AE";
+const TEST_PUNY_ORIGIN = "https://xn--hxajbheg2az3al.xn--jxalpdlp/";
+const TEST_PUNY_SUB_ORIGIN = "https://sub1.xn--hxajbheg2az3al.xn--jxalpdlp/";
+
+ChromeUtils.defineESModuleGetters(this, {
+  SiteDataTestUtils: "resource://testing-common/SiteDataTestUtils.sys.mjs",
+});
+
+async function testClearing(
+  testQuota,
+  testCookies,
+  testURI,
+  originA,
+  subOriginA,
+  originB
+) {
+  // Create a variant of originB which is partitioned under top level originA.
+  let { scheme, host } = Services.io.newURI(originA);
+  let partitionKey = `(${scheme},${host})`;
+
+  let { origin: originBPartitioned } =
+    Services.scriptSecurityManager.createContentPrincipal(
+      Services.io.newURI(originB),
+      { partitionKey }
+    );
+
+  // Add some test quota storage.
+  if (testQuota) {
+    await SiteDataTestUtils.addToIndexedDB(originA);
+    await SiteDataTestUtils.addToIndexedDB(subOriginA);
+    await SiteDataTestUtils.addToIndexedDB(originBPartitioned);
+  }
+
+  // Add some test cookies.
+  if (testCookies) {
+    SiteDataTestUtils.addToCookies({
+      origin: originA,
+      name: "test1",
+      value: "1",
+    });
+    SiteDataTestUtils.addToCookies({
+      origin: originA,
+      name: "test2",
+      value: "2",
+    });
+    SiteDataTestUtils.addToCookies({
+      origin: subOriginA,
+      name: "test3",
+      value: "1",
+    });
+
+    SiteDataTestUtils.addToCookies({
+      origin: originBPartitioned,
+      name: "test4",
+      value: "1",
+    });
+  }
+
+  await BrowserTestUtils.withNewTab(testURI, async function (browser) {
+    // Verify we have added quota storage.
+    if (testQuota) {
+      let usage = await SiteDataTestUtils.getQuotaUsage(originA);
+      Assert.greater(usage, 0, "Should have data for the base origin.");
+
+      usage = await SiteDataTestUtils.getQuotaUsage(subOriginA);
+      Assert.greater(usage, 0, "Should have data for the sub origin.");
+
+      usage = await SiteDataTestUtils.getQuotaUsage(originBPartitioned);
+      Assert.greater(usage, 0, "Should have data for the partitioned origin.");
+    }
+
+    // Open the identity popup.
+    let { gIdentityHandler } = gBrowser.ownerGlobal;
+    let promisePanelOpen = BrowserTestUtils.waitForEvent(
+      gBrowser.ownerGlobal,
+      "popupshown",
+      true,
+      event => event.target == gIdentityHandler._identityPopup
+    );
+    gIdentityHandler._identityIconBox.click();
+    await promisePanelOpen;
+
+    let clearFooter = document.getElementById(
+      "identity-popup-clear-sitedata-footer"
+    );
+    let clearButton = document.getElementById(
+      "identity-popup-clear-sitedata-button"
+    );
+    TestUtils.waitForCondition(
+      () => !clearFooter.hidden,
+      "The clear data footer is not hidden."
+    );
+
+    let cookiesCleared;
+    if (testCookies) {
+      cookiesCleared = Promise.all([
+        TestUtils.topicObserved(
+          "cookie-changed",
+          (subj, data) => data == "deleted" && subj.name == "test1"
+        ),
+        TestUtils.topicObserved(
+          "cookie-changed",
+          (subj, data) => data == "deleted" && subj.name == "test2"
+        ),
+        TestUtils.topicObserved(
+          "cookie-changed",
+          (subj, data) => data == "deleted" && subj.name == "test3"
+        ),
+        TestUtils.topicObserved(
+          "cookie-changed",
+          (subj, data) => data == "deleted" && subj.name == "test4"
+        ),
+      ]);
+    }
+
+    // Click the "Clear data" button.
+    let siteDataUpdated = TestUtils.topicObserved(
+      "sitedatamanager:sites-updated"
+    );
+    let hideEvent = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "popuphidden"
+    );
+    let removeDialogPromise = BrowserTestUtils.promiseAlertDialogOpen(
+      "accept",
+      REMOVE_DIALOG_URL
+    );
+    clearButton.click();
+    await hideEvent;
+    await removeDialogPromise;
+
+    await siteDataUpdated;
+
+    // Check that cookies were deleted.
+    if (testCookies) {
+      await cookiesCleared;
+      let uri = Services.io.newURI(originA);
+      is(
+        Services.cookies.countCookiesFromHost(uri.host),
+        0,
+        "Cookies from the base domain should be cleared"
+      );
+      uri = Services.io.newURI(subOriginA);
+      is(
+        Services.cookies.countCookiesFromHost(uri.host),
+        0,
+        "Cookies from the sub domain should be cleared"
+      );
+      ok(
+        !SiteDataTestUtils.hasCookies(originBPartitioned),
+        "Partitioned cookies should be cleared"
+      );
+    }
+
+    // Check that quota storage was deleted.
+    if (testQuota) {
+      await TestUtils.waitForCondition(async () => {
+        let usage = await SiteDataTestUtils.getQuotaUsage(originA);
+        return usage == 0;
+      }, "Should have no data for the base origin.");
+
+      let usage = await SiteDataTestUtils.getQuotaUsage(subOriginA);
+      is(usage, 0, "Should have no data for the sub origin.");
+
+      usage = await SiteDataTestUtils.getQuotaUsage(originBPartitioned);
+      is(usage, 0, "Should have no data for the partitioned origin.");
+    }
+
+    // Open the site identity panel again to check that the button isn't shown anymore.
+    promisePanelOpen = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "popupshown"
+    );
+    gIdentityHandler._identityIconBox.click();
+    await promisePanelOpen;
+
+    // Wait for a second to see if the button is shown.
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    await new Promise(c => setTimeout(c, 1000));
+
+    ok(
+      clearFooter.hidden,
+      "The clear data footer is hidden after clearing data."
+    );
+  });
+}
+
+// Test removing quota managed storage.
+add_task(async function test_ClearSiteData() {
+  await testClearing(
+    true,
+    false,
+    TEST_ORIGIN,
+    TEST_ORIGIN,
+    TEST_SUB_ORIGIN,
+    TEST_ORIGIN_2
+  );
+});
+
+// Test removing cookies.
+add_task(async function test_ClearCookies() {
+  await testClearing(
+    false,
+    true,
+    TEST_ORIGIN,
+    TEST_ORIGIN,
+    TEST_SUB_ORIGIN,
+    TEST_ORIGIN_2
+  );
+});
+
+// Test removing both.
+add_task(async function test_ClearCookiesAndSiteData() {
+  await testClearing(
+    true,
+    true,
+    TEST_ORIGIN,
+    TEST_ORIGIN,
+    TEST_SUB_ORIGIN,
+    TEST_ORIGIN_2
+  );
+});
+
+// Test IDN Domains
+add_task(async function test_IDN_ClearCookiesAndSiteData() {
+  await testClearing(
+    true,
+    true,
+    TEST_IDN_ORIGIN,
+    TEST_PUNY_ORIGIN,
+    TEST_PUNY_SUB_ORIGIN,
+    TEST_ORIGIN_2
+  );
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityPopup_clearSiteData_extensions.js b/browser/base/content/test/siteIdentity/browser_identityPopup_clearSiteData_extensions.js
new file mode 100644
index 0000000000..2d0d9f7068
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityPopup_clearSiteData_extensions.js
@@ -0,0 +1,80 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/*
+ *  Test for Bug 1661534 - Extension page: "Clear Cookies and Site Data"
+ *  does nothing.
+ *
+ *  Expected behavior: when viewing a page controlled by a WebExtension,
+ *  the "Clear Cookies and Site Data..." button should not be visible.
+ */
+
+add_task(async function testClearSiteDataFooterHiddenForExtensions() {
+  // Create an extension that opens an options page
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "temporary",
+
+    manifest: {
+      permissions: ["tabs"],
+      options_ui: {
+        page: "options.html",
+        open_in_tab: true,
+      },
+    },
+    files: {
+      "options.html": `<!DOCTYPE html>
+        <html>
+          <head>
+            <meta charset="utf-8">
+          </head>
+          <body>
+            <h1>This is a test options page for a WebExtension</h1>
+          </body>
+        </html>`,
+    },
+    async background() {
+      await browser.runtime.openOptionsPage();
+      browser.test.sendMessage("optionsopened");
+    },
+  });
+
+  // Run the extension and wait until its options page has finished loading
+  let browser = gBrowser.selectedBrowser;
+  let browserLoadedPromise = BrowserTestUtils.browserLoaded(browser);
+  await extension.startup();
+  await extension.awaitMessage("optionsopened");
+  await browserLoadedPromise;
+
+  await SpecialPowers.spawn(browser, [], () => {
+    ok(
+      content.document.documentURI.startsWith("moz-extension://"),
+      "Extension page has now finished loading in the browser window"
+    );
+  });
+
+  // Open the site identity popup
+  let { gIdentityHandler } = gBrowser.ownerGlobal;
+  let promisePanelOpen = BrowserTestUtils.waitForEvent(
+    gBrowser.ownerGlobal,
+    "popupshown",
+    true,
+    event => event.target == gIdentityHandler._identityPopup
+  );
+  gIdentityHandler._identityIconBox.click();
+  await promisePanelOpen;
+
+  let clearSiteDataFooter = document.getElementById(
+    "identity-popup-clear-sitedata-footer"
+  );
+
+  ok(
+    clearSiteDataFooter.hidden,
+    "The clear site data footer is hidden on a WebExtension page."
+  );
+
+  // Unload the extension
+  await extension.unload();
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityPopup_custom_roots.js b/browser/base/content/test/siteIdentity/browser_identityPopup_custom_roots.js
new file mode 100644
index 0000000000..2b9ef53bb0
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityPopup_custom_roots.js
@@ -0,0 +1,82 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/* Test that the UI for imported root certificates shows up correctly in the identity popup.
+ */
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+
+// This test is incredibly simple, because our test framework already
+// imports root certificates by default, so we just visit example.com
+// and verify that the custom root certificates UI is visible.
+add_task(async function test_https() {
+  await BrowserTestUtils.withNewTab("https://example.com", async function () {
+    let promisePanelOpen = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      event => event.target == gIdentityHandler._identityPopup
+    );
+
+    gIdentityHandler._identityIconBox.click();
+    await promisePanelOpen;
+    let customRootWarning = document.getElementById(
+      "identity-popup-security-decription-custom-root"
+    );
+    ok(
+      BrowserTestUtils.is_visible(customRootWarning),
+      "custom root warning is visible"
+    );
+
+    let securityView = document.getElementById("identity-popup-securityView");
+    let shown = BrowserTestUtils.waitForEvent(securityView, "ViewShown");
+    document.getElementById("identity-popup-security-button").click();
+    await shown;
+
+    let subPanelInfo = document.getElementById(
+      "identity-popup-content-verifier-unknown"
+    );
+    ok(
+      BrowserTestUtils.is_visible(subPanelInfo),
+      "custom root warning in sub panel is visible"
+    );
+  });
+});
+
+// Also check that there are conditions where this isn't shown.
+add_task(async function test_http() {
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  await BrowserTestUtils.withNewTab("http://example.com", async function () {
+    let promisePanelOpen = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      event => event.target == gIdentityHandler._identityPopup
+    );
+    gIdentityHandler._identityIconBox.click();
+    await promisePanelOpen;
+    let customRootWarning = document.getElementById(
+      "identity-popup-security-decription-custom-root"
+    );
+    ok(
+      BrowserTestUtils.is_hidden(customRootWarning),
+      "custom root warning is hidden"
+    );
+
+    let securityView = document.getElementById("identity-popup-securityView");
+    let shown = BrowserTestUtils.waitForEvent(securityView, "ViewShown");
+    document.getElementById("identity-popup-security-button").click();
+    await shown;
+
+    let subPanelInfo = document.getElementById(
+      "identity-popup-content-verifier-unknown"
+    );
+    ok(
+      BrowserTestUtils.is_hidden(subPanelInfo),
+      "custom root warning in sub panel is hidden"
+    );
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identityPopup_focus.js b/browser/base/content/test/siteIdentity/browser_identityPopup_focus.js
new file mode 100644
index 0000000000..80e70619ff
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identityPopup_focus.js
@@ -0,0 +1,120 @@
+/* Tests the focus behavior of the identity popup. */
+
+// Focusing on the identity box is handled by the ToolbarKeyboardNavigator
+// component (see browser/base/content/browser-toolbarKeyNav.js).
+async function focusIdentityBox() {
+  gURLBar.inputField.focus();
+  is(document.activeElement, gURLBar.inputField, "urlbar should be focused");
+  const focused = BrowserTestUtils.waitForEvent(
+    gIdentityHandler._identityIconBox,
+    "focus"
+  );
+  EventUtils.synthesizeKey("VK_TAB", { shiftKey: true });
+  EventUtils.synthesizeKey("ArrowRight");
+  await focused;
+}
+
+// Access the identity popup via mouseclick. Focus should not be moved inside.
+add_task(async function testIdentityPopupFocusClick() {
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await BrowserTestUtils.withNewTab("https://example.com", async function () {
+    let shown = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      event => event.target == gIdentityHandler._identityPopup
+    );
+    EventUtils.synthesizeMouseAtCenter(gIdentityHandler._identityIconBox, {});
+    await shown;
+    isnot(
+      Services.focus.focusedElement,
+      document.getElementById("identity-popup-security-button")
+    );
+  });
+});
+
+// Access the identity popup via keyboard. Focus should be moved inside.
+add_task(async function testIdentityPopupFocusKeyboard() {
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await BrowserTestUtils.withNewTab("https://example.com", async function () {
+    await focusIdentityBox();
+    let shown = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      event => event.target == gIdentityHandler._identityPopup
+    );
+    EventUtils.sendString(" ");
+    await shown;
+    is(
+      Services.focus.focusedElement,
+      document.getElementById("identity-popup-security-button")
+    );
+  });
+});
+
+// Access the Site Security panel, then move focus with the tab key.
+// Tabbing should be able to reach the More Information button.
+add_task(async function testSiteSecurityTabOrder() {
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+  await BrowserTestUtils.withNewTab("https://example.com", async function () {
+    // 1. Access the identity popup.
+    await focusIdentityBox();
+    let shown = BrowserTestUtils.waitForEvent(
+      window,
+      "popupshown",
+      true,
+      event => event.target == gIdentityHandler._identityPopup
+    );
+    EventUtils.sendString(" ");
+    await shown;
+    is(
+      Services.focus.focusedElement,
+      document.getElementById("identity-popup-security-button")
+    );
+
+    // 2. Access the Site Security section.
+    let securityView = document.getElementById("identity-popup-securityView");
+    shown = BrowserTestUtils.waitForEvent(securityView, "ViewShown");
+    EventUtils.sendString(" ");
+    await shown;
+
+    // 3. Custom root learn more info should be focused by default
+    // This is probably not present in real-world scenarios, but needs to be present in our test infrastructure.
+    let customRootLearnMore = document.getElementById(
+      "identity-popup-custom-root-learn-more"
+    );
+    is(
+      Services.focus.focusedElement,
+      customRootLearnMore,
+      "learn more option for custom roots is focused"
+    );
+
+    // 4. First press of tab should move to the More Information button.
+    let moreInfoButton = document.getElementById("identity-popup-more-info");
+    let focused = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "focusin"
+    );
+    EventUtils.sendKey("tab");
+    await focused;
+    is(
+      Services.focus.focusedElement,
+      moreInfoButton,
+      "more info button is focused"
+    );
+
+    // 5. Second press of tab should focus the Back button.
+    let backButton = gIdentityHandler._identityPopup.querySelector(
+      ".subviewbutton-back"
+    );
+    // Wait for focus to move somewhere. We use focusin because focus doesn't bubble.
+    focused = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "focusin"
+    );
+    EventUtils.sendKey("tab");
+    await focused;
+    is(Services.focus.focusedElement, backButton, "back button is focused");
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_identity_UI.js b/browser/base/content/test/siteIdentity/browser_identity_UI.js
new file mode 100644
index 0000000000..bda5e225b0
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_identity_UI.js
@@ -0,0 +1,192 @@
+/* Tests for correct behaviour of getHostForDisplay on identity handler */
+
+requestLongerTimeout(2);
+
+// Greek IDN for 'example.test'.
+var idnDomain =
+  "\u03C0\u03B1\u03C1\u03AC\u03B4\u03B5\u03B9\u03B3\u03BC\u03B1.\u03B4\u03BF\u03BA\u03B9\u03BC\u03AE";
+var tests = [
+  {
+    name: "normal domain",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    location: "http://test1.example.org/",
+    hostForDisplay: "test1.example.org",
+    hasSubview: true,
+  },
+  {
+    name: "view-source",
+    location: "view-source:http://example.com/",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    newURI: "http://example.com/",
+    hostForDisplay: "example.com",
+    hasSubview: true,
+  },
+  {
+    name: "normal HTTPS",
+    location: "https://example.com/",
+    hostForDisplay: "example.com",
+    hasSubview: true,
+  },
+  {
+    name: "IDN subdomain",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    location: "http://sub1.xn--hxajbheg2az3al.xn--jxalpdlp/",
+    hostForDisplay: "sub1." + idnDomain,
+    hasSubview: true,
+  },
+  {
+    name: "subdomain with port",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    location: "http://sub1.test1.example.org:8000/",
+    hostForDisplay: "sub1.test1.example.org",
+    hasSubview: true,
+  },
+  {
+    name: "subdomain HTTPS",
+    location: "https://test1.example.com/",
+    hostForDisplay: "test1.example.com",
+    hasSubview: true,
+  },
+  {
+    name: "view-source HTTPS",
+    location: "view-source:https://example.com/",
+    newURI: "https://example.com/",
+    hostForDisplay: "example.com",
+    hasSubview: true,
+  },
+  {
+    name: "IP address",
+    location: "http://127.0.0.1:8888/",
+    hostForDisplay: "127.0.0.1",
+    hasSubview: false,
+  },
+  {
+    name: "about:certificate",
+    location:
+      "about:certificate?cert=MIIHQjCCBiqgAwIBAgIQCgYwQn9bvO&cert=1pVzllk7ZFHzANBgkqhkiG9w0BAQ",
+    hostForDisplay: "about:certificate",
+    hasSubview: false,
+  },
+  {
+    name: "about:reader",
+    location: "about:reader?url=http://example.com",
+    hostForDisplay: "example.com",
+    hasSubview: false,
+  },
+  {
+    name: "chrome:",
+    location: "chrome://global/skin/in-content/info-pages.css",
+    hostForDisplay: "chrome://global/skin/in-content/info-pages.css",
+    hasSubview: false,
+  },
+];
+
+add_task(async function test() {
+  ok(gIdentityHandler, "gIdentityHandler should exist");
+
+  await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  for (let i = 0; i < tests.length; i++) {
+    await runTest(i, true);
+  }
+
+  gBrowser.removeCurrentTab();
+  await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  for (let i = tests.length - 1; i >= 0; i--) {
+    await runTest(i, false);
+  }
+
+  gBrowser.removeCurrentTab();
+});
+
+async function runTest(i, forward) {
+  let currentTest = tests[i];
+  let testDesc = "#" + i + " (" + currentTest.name + ")";
+  if (!forward) {
+    testDesc += " (second time)";
+  }
+
+  info("Running test " + testDesc);
+
+  let popupHidden = null;
+  if ((forward && i > 0) || (!forward && i < tests.length - 1)) {
+    popupHidden = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "popuphidden"
+    );
+  }
+
+  let loaded = BrowserTestUtils.browserLoaded(
+    gBrowser.selectedBrowser,
+    false,
+    currentTest.location
+  );
+  BrowserTestUtils.loadURIString(
+    gBrowser.selectedBrowser,
+    currentTest.location
+  );
+  await loaded;
+  await popupHidden;
+  ok(
+    !gIdentityHandler._identityPopup ||
+      BrowserTestUtils.is_hidden(gIdentityHandler._identityPopup),
+    "Control Center is hidden"
+  );
+
+  // Sanity check other values, and the value of gIdentityHandler.getHostForDisplay()
+  is(
+    gIdentityHandler._uri.spec,
+    currentTest.newURI || currentTest.location,
+    "location matches for test " + testDesc
+  );
+  // getHostForDisplay can't be called for all modes
+  if (currentTest.hostForDisplay !== null) {
+    is(
+      gIdentityHandler.getHostForDisplay(),
+      currentTest.hostForDisplay,
+      "hostForDisplay matches for test " + testDesc
+    );
+  }
+
+  // Open the Control Center and make sure it closes after nav (Bug 1207542).
+  let popupShown = BrowserTestUtils.waitForEvent(
+    window,
+    "popupshown",
+    true,
+    event => event.target == gIdentityHandler._identityPopup
+  );
+  gIdentityHandler._identityIconBox.click();
+  info("Waiting for the Control Center to be shown");
+  await popupShown;
+  ok(
+    !BrowserTestUtils.is_hidden(gIdentityHandler._identityPopup),
+    "Control Center is visible"
+  );
+  let displayedHost = currentTest.hostForDisplay || currentTest.location;
+  ok(
+    gIdentityHandler._identityPopupMainViewHeaderLabel.textContent.includes(
+      displayedHost
+    ),
+    "identity UI header shows the host for test " + testDesc
+  );
+
+  let securityButton = gBrowser.ownerDocument.querySelector(
+    "#identity-popup-security-button"
+  );
+  is(
+    securityButton.disabled,
+    !currentTest.hasSubview,
+    "Security button has correct disabled state"
+  );
+  if (currentTest.hasSubview) {
+    // Show the subview, which is an easy way in automation to reproduce
+    // Bug 1207542, where the CC wouldn't close on navigation.
+    let promiseViewShown = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "ViewShown"
+    );
+    securityButton.click();
+    await promiseViewShown;
+  }
+}
diff --git a/browser/base/content/test/siteIdentity/browser_iframe_navigation.js b/browser/base/content/test/siteIdentity/browser_iframe_navigation.js
new file mode 100644
index 0000000000..ac2884d31a
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_iframe_navigation.js
@@ -0,0 +1,108 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that the site identity icon and related machinery reflects the correct
+// security state after navigating an iframe in various contexts.
+// See bug 1490982.
+
+const ROOT_URI = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+const SECURE_TEST_URI = ROOT_URI + "iframe_navigation.html";
+// eslint-disable-next-line @microsoft/sdl/no-insecure-url
+const INSECURE_TEST_URI = SECURE_TEST_URI.replace("https://", "http://");
+
+// From a secure URI, navigate the iframe to about:blank (should still be
+// secure).
+add_task(async function () {
+  let uri = SECURE_TEST_URI + "#blank";
+  await BrowserTestUtils.withNewTab(uri, async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "verifiedDomain", "identity should be secure before");
+
+    await SpecialPowers.spawn(browser, [], async () => {
+      content.postMessage("", "*"); // This kicks off the navigation.
+      await ContentTaskUtils.waitForCondition(() => {
+        return !content.document.body.classList.contains("running");
+      });
+    });
+
+    let newIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(newIdentityMode, "verifiedDomain", "identity should be secure after");
+  });
+});
+
+// From a secure URI, navigate the iframe to an insecure URI (http://...)
+// (mixed active content should be blocked, should still be secure).
+add_task(async function () {
+  let uri = SECURE_TEST_URI + "#insecure";
+  await BrowserTestUtils.withNewTab(uri, async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "verifiedDomain", "identity should be secure before");
+
+    await SpecialPowers.spawn(browser, [], async () => {
+      content.postMessage("", "*"); // This kicks off the navigation.
+      await ContentTaskUtils.waitForCondition(() => {
+        return !content.document.body.classList.contains("running");
+      });
+    });
+
+    let newIdentityMode =
+      window.document.getElementById("identity-box").classList;
+    ok(
+      newIdentityMode.contains("mixedActiveBlocked"),
+      "identity should be blocked mixed active content after"
+    );
+    ok(
+      newIdentityMode.contains("verifiedDomain"),
+      "identity should still contain 'verifiedDomain'"
+    );
+    is(newIdentityMode.length, 2, "shouldn't have any other identity states");
+  });
+});
+
+// From an insecure URI (http://..), navigate the iframe to about:blank (should
+// still be insecure).
+add_task(async function () {
+  let uri = INSECURE_TEST_URI + "#blank";
+  await BrowserTestUtils.withNewTab(uri, async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "notSecure", "identity should be 'not secure' before");
+
+    await SpecialPowers.spawn(browser, [], async () => {
+      content.postMessage("", "*"); // This kicks off the navigation.
+      await ContentTaskUtils.waitForCondition(() => {
+        return !content.document.body.classList.contains("running");
+      });
+    });
+
+    let newIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(newIdentityMode, "notSecure", "identity should be 'not secure' after");
+  });
+});
+
+// From an insecure URI (http://..), navigate the iframe to a secure URI
+// (https://...) (should still be insecure).
+add_task(async function () {
+  let uri = INSECURE_TEST_URI + "#secure";
+  await BrowserTestUtils.withNewTab(uri, async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "notSecure", "identity should be 'not secure' before");
+
+    await SpecialPowers.spawn(browser, [], async () => {
+      content.postMessage("", "*"); // This kicks off the navigation.
+      await ContentTaskUtils.waitForCondition(() => {
+        return !content.document.body.classList.contains("running");
+      });
+    });
+
+    let newIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(newIdentityMode, "notSecure", "identity should be 'not secure' after");
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_ignore_same_page_navigation.js b/browser/base/content/test/siteIdentity/browser_ignore_same_page_navigation.js
new file mode 100644
index 0000000000..86ec70a0cf
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_ignore_same_page_navigation.js
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that the nsISecureBrowserUI implementation doesn't send extraneous OnSecurityChange events
+// when it receives OnLocationChange events with the LOCATION_CHANGE_SAME_DOCUMENT flag set.
+
+add_task(async function () {
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    let onLocationChangeCount = 0;
+    let onSecurityChangeCount = 0;
+    let progressListener = {
+      onStateChange() {},
+      onLocationChange() {
+        onLocationChangeCount++;
+      },
+      onSecurityChange() {
+        onSecurityChangeCount++;
+      },
+      onProgressChange() {},
+      onStatusChange() {},
+
+      QueryInterface: ChromeUtils.generateQI([
+        "nsIWebProgressListener",
+        "nsISupportsWeakReference",
+      ]),
+    };
+    browser.addProgressListener(progressListener, Ci.nsIWebProgress.NOTIFY_ALL);
+
+    let uri =
+      getRootDirectory(gTestPath).replace(
+        "chrome://mochitests/content",
+        "https://example.com"
+      ) + "dummy_page.html";
+    BrowserTestUtils.loadURIString(browser, uri);
+    await BrowserTestUtils.browserLoaded(browser, false, uri);
+    is(onLocationChangeCount, 1, "should have 1 onLocationChange event");
+    is(onSecurityChangeCount, 1, "should have 1 onSecurityChange event");
+    await SpecialPowers.spawn(browser, [], async () => {
+      content.history.pushState({}, "", "https://example.com");
+    });
+    is(onLocationChangeCount, 2, "should have 2 onLocationChange events");
+    is(
+      onSecurityChangeCount,
+      1,
+      "should still have only 1 onSecurityChange event"
+    );
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_mcb_redirect.js b/browser/base/content/test/siteIdentity/browser_mcb_redirect.js
new file mode 100644
index 0000000000..df7f6be15c
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mcb_redirect.js
@@ -0,0 +1,360 @@
+/*
+ * Description of the Tests for
+ *  - Bug 418354 - Call Mixed content blocking on redirects
+ *
+ * Single redirect script tests
+ * 1. Load a script over https inside an https page
+ *    - the server responds with a 302 redirect to a >> HTTP << script
+ *    - the doorhanger should appear!
+ *
+ * 2. Load a script over https inside an http page
+ *    - the server responds with a 302 redirect to a >> HTTP << script
+ *    - the doorhanger should not appear!
+ *
+ * Single redirect image tests
+ * 3. Load an image over https inside an https page
+ *    - the server responds with a 302 redirect to a >> HTTP << image
+ *    - the image should not load
+ *
+ * 4. Load an image over https inside an http page
+ *    - the server responds with a 302 redirect to a >> HTTP << image
+ *    - the image should load and get cached
+ *
+ * Single redirect cached image tests
+ * 5. Using offline mode to ensure we hit the cache, load a cached image over
+ *    https inside an http page
+ *    - the server would have responded with a 302 redirect to a >> HTTP <<
+ *      image, but instead we try to use the cached image.
+ *    - the image should load
+ *
+ * 6. Using offline mode to ensure we hit the cache, load a cached image over
+ *    https inside an https page
+ *    - the server would have responded with a 302 redirect to a >> HTTP <<
+ *      image, but instead we try to use the cached image.
+ *    - the image should not load
+ *
+ * Double redirect image test
+ * 7. Load an image over https inside an http page
+ *    - the server responds with a 302 redirect to a >> HTTP << server
+ *    - the HTTP server responds with a 302 redirect to a >> HTTPS << image
+ *    - the image should load and get cached
+ *
+ * Double redirect cached image tests
+ * 8. Using offline mode to ensure we hit the cache, load a cached image over
+ *    https inside an http page
+ *    - the image would have gone through two redirects: HTTPS->HTTP->HTTPS,
+ *      but instead we try to use the cached image.
+ *    - the image should load
+ *
+ * 9. Using offline mode to ensure we hit the cache, load a cached image over
+ *    https inside an https page
+ *    - the image would have gone through two redirects: HTTPS->HTTP->HTTPS,
+ *      but instead we try to use the cached image.
+ *    - the image should not load
+ */
+
+const PREF_ACTIVE = "security.mixed_content.block_active_content";
+const PREF_DISPLAY = "security.mixed_content.block_display_content";
+const PREF_DISPLAY_UPGRADE = "security.mixed_content.upgrade_display_content";
+const HTTPS_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+const HTTP_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  "http://example.com"
+);
+const PREF_INSECURE_ICON = "security.insecure_connection_icon.enabled";
+
+var origBlockActive;
+var origBlockDisplay;
+var origUpgradeDisplay;
+var origInsecurePref;
+var gTestBrowser = null;
+
+// ------------------------ Helper Functions ---------------------
+
+registerCleanupFunction(function () {
+  // Set preferences back to their original values
+  Services.prefs.setBoolPref(PREF_ACTIVE, origBlockActive);
+  Services.prefs.setBoolPref(PREF_DISPLAY, origBlockDisplay);
+  Services.prefs.setBoolPref(PREF_DISPLAY_UPGRADE, origUpgradeDisplay);
+  Services.prefs.setBoolPref(PREF_INSECURE_ICON, origInsecurePref);
+
+  // Make sure we are online again
+  Services.io.offline = false;
+});
+
+function cleanUpAfterTests() {
+  gBrowser.removeCurrentTab();
+  window.focus();
+  finish();
+}
+
+// ------------------------ Test 1 ------------------------------
+
+function test1() {
+  Services.prefs.setBoolPref(PREF_INSECURE_ICON, false);
+
+  var url = HTTPS_TEST_ROOT + "test_mcb_redirect.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkUIForTest1
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function testInsecure1() {
+  Services.prefs.setBoolPref(PREF_INSECURE_ICON, true);
+
+  var url = HTTPS_TEST_ROOT + "test_mcb_redirect.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkUIForTest1
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+async function checkUIForTest1() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "script blocked";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test1!"
+    );
+  }).then(test2);
+}
+
+// ------------------------ Test 2 ------------------------------
+
+function test2() {
+  var url = HTTP_TEST_ROOT + "test_mcb_redirect.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkUIForTest2
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+async function checkUIForTest2() {
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: false,
+    passiveLoaded: false,
+  });
+
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "script executed";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test2!"
+    );
+  }).then(test3);
+}
+
+// ------------------------ Test 3 ------------------------------
+// HTTPS page loading insecure image
+function test3() {
+  info("test3");
+  var url = HTTPS_TEST_ROOT + "test_mcb_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest3
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest3() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image blocked";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test3!"
+    );
+  }).then(test4);
+}
+
+// ------------------------ Test 4 ------------------------------
+// HTTP page loading insecure image
+function test4() {
+  info("test4");
+  var url = HTTP_TEST_ROOT + "test_mcb_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest4
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest4() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image loaded";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test4!"
+    );
+  }).then(test5);
+}
+
+// ------------------------ Test 5 ------------------------------
+// HTTP page laoding insecure cached image
+// Assuming test 4 succeeded, the image has already been loaded once
+// and hence should be cached per the sjs cache-control header
+// Going into offline mode to ensure we are loading from the cache.
+function test5() {
+  // Go into offline mode
+  info("test5");
+  Services.io.offline = true;
+  var url = HTTP_TEST_ROOT + "test_mcb_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest5
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest5() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image loaded";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test5!"
+    );
+  }).then(() => {
+    // Go back online
+    Services.io.offline = false;
+    test6();
+  });
+}
+
+// ------------------------ Test 6 ------------------------------
+// HTTPS page loading insecure cached image
+// Assuming test 4 succeeded, the image has already been loaded once
+// and hence should be cached per the sjs cache-control header
+// Going into offline mode to ensure we are loading from the cache.
+function test6() {
+  // Go into offline mode
+  info("test6");
+  Services.io.offline = true;
+  var url = HTTPS_TEST_ROOT + "test_mcb_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest6
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest6() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image blocked";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test6!"
+    );
+  }).then(() => {
+    // Go back online
+    Services.io.offline = false;
+    test7();
+  });
+}
+
+// ------------------------ Test 7 ------------------------------
+// HTTP page loading insecure image that went through a double redirect
+function test7() {
+  var url = HTTP_TEST_ROOT + "test_mcb_double_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest7
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest7() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image loaded";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test7!"
+    );
+  }).then(test8);
+}
+
+// ------------------------ Test 8 ------------------------------
+// HTTP page loading insecure cached image that went through a double redirect
+// Assuming test 7 succeeded, the image has already been loaded once
+// and hence should be cached per the sjs cache-control header
+// Going into offline mode to ensure we are loading from the cache.
+function test8() {
+  // Go into offline mode
+  Services.io.offline = true;
+  var url = HTTP_TEST_ROOT + "test_mcb_double_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest8
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest8() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image loaded";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test8!"
+    );
+  }).then(() => {
+    // Go back online
+    Services.io.offline = false;
+    test9();
+  });
+}
+
+// ------------------------ Test 9 ------------------------------
+// HTTPS page loading insecure cached image that went through a double redirect
+// Assuming test 7 succeeded, the image has already been loaded once
+// and hence should be cached per the sjs cache-control header
+// Going into offline mode to ensure we are loading from the cache.
+function test9() {
+  // Go into offline mode
+  Services.io.offline = true;
+  var url = HTTPS_TEST_ROOT + "test_mcb_double_redirect_image.html";
+  BrowserTestUtils.browserLoaded(gTestBrowser, false, url).then(
+    checkLoadEventForTest9
+  );
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+}
+
+function checkLoadEventForTest9() {
+  SpecialPowers.spawn(gTestBrowser, [], async function () {
+    var expected = "image blocked";
+    await ContentTaskUtils.waitForCondition(
+      () => content.document.getElementById("mctestdiv").innerHTML == expected,
+      "OK: Expected result in innerHTML for Test9!"
+    );
+  }).then(() => {
+    // Go back online
+    Services.io.offline = false;
+    cleanUpAfterTests();
+  });
+}
+
+// ------------------------ SETUP ------------------------------
+
+function test() {
+  // Performing async calls, e.g. 'onload', we have to wait till all of them finished
+  waitForExplicitFinish();
+
+  // Store original preferences so we can restore settings after testing
+  origBlockActive = Services.prefs.getBoolPref(PREF_ACTIVE);
+  origBlockDisplay = Services.prefs.getBoolPref(PREF_DISPLAY);
+  origUpgradeDisplay = Services.prefs.getBoolPref(PREF_DISPLAY_UPGRADE);
+  origInsecurePref = Services.prefs.getBoolPref(PREF_INSECURE_ICON);
+  Services.prefs.setBoolPref(PREF_ACTIVE, true);
+  Services.prefs.setBoolPref(PREF_DISPLAY, true);
+  Services.prefs.setBoolPref(PREF_DISPLAY_UPGRADE, false);
+
+  var newTab = BrowserTestUtils.addTab(gBrowser);
+  gBrowser.selectedTab = newTab;
+  gTestBrowser = gBrowser.selectedBrowser;
+  newTab.linkedBrowser.stop();
+
+  executeSoon(testInsecure1);
+}
diff --git a/browser/base/content/test/siteIdentity/browser_mixedContentFramesOnHttp.js b/browser/base/content/test/siteIdentity/browser_mixedContentFramesOnHttp.js
new file mode 100644
index 0000000000..c6096342cc
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mixedContentFramesOnHttp.js
@@ -0,0 +1,37 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Test for Bug 1182551 -
+ *
+ * This test has a top level HTTP page with an HTTPS iframe.  The HTTPS iframe
+ * includes an HTTP image.  We check that the top level security state is
+ * STATE_IS_INSECURE.  The mixed content from the iframe shouldn't "upgrade"
+ * the HTTP top level page to broken HTTPS.
+ */
+
+const TEST_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    "http://example.com"
+  ) + "file_mixedContentFramesOnHttp.html";
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["security.mixed_content.block_active_content", true],
+      ["security.mixed_content.block_display_content", false],
+      ["security.mixed_content.upgrade_display_content", false],
+    ],
+  });
+
+  await BrowserTestUtils.withNewTab(TEST_URL, async function (browser) {
+    isSecurityState(browser, "insecure");
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: false,
+      activeBlocked: false,
+      passiveLoaded: true,
+    });
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_mixedContentFromOnunload.js b/browser/base/content/test/siteIdentity/browser_mixedContentFromOnunload.js
new file mode 100644
index 0000000000..c9e11e54a7
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mixedContentFromOnunload.js
@@ -0,0 +1,68 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Tests for Bug 947079 - Fix bug in nsSecureBrowserUIImpl that sets the wrong
+ * security state on a page because of a subresource load that is not on the
+ * same page.
+ */
+
+// We use different domains for each test and for navigation within each test
+const HTTP_TEST_ROOT_1 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  "http://example.com"
+);
+const HTTPS_TEST_ROOT_1 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test1.example.com"
+);
+const HTTP_TEST_ROOT_2 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  "http://example.net"
+);
+const HTTPS_TEST_ROOT_2 = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://test2.example.com"
+);
+
+add_task(async function () {
+  let url = HTTP_TEST_ROOT_1 + "file_mixedContentFromOnunload.html";
+  await BrowserTestUtils.withNewTab(url, async function (browser) {
+    await SpecialPowers.pushPrefEnv({
+      set: [
+        ["security.mixed_content.block_active_content", true],
+        ["security.mixed_content.block_display_content", false],
+        ["security.mixed_content.upgrade_display_content", false],
+      ],
+    });
+    // Navigation from an http page to a https page with no mixed content
+    // The http page loads an http image on unload
+    url = HTTPS_TEST_ROOT_1 + "file_mixedContentFromOnunload_test1.html";
+    BrowserTestUtils.loadURIString(browser, url);
+    await BrowserTestUtils.browserLoaded(browser);
+    // check security state.  Since current url is https and doesn't have any
+    // mixed content resources, we expect it to be secure.
+    isSecurityState(browser, "secure");
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: false,
+      activeBlocked: false,
+      passiveLoaded: false,
+    });
+    // Navigation from an http page to a https page that has mixed display content
+    // The https page loads an http image on unload
+    url = HTTP_TEST_ROOT_2 + "file_mixedContentFromOnunload.html";
+    BrowserTestUtils.loadURIString(browser, url);
+    await BrowserTestUtils.browserLoaded(browser);
+    url = HTTPS_TEST_ROOT_2 + "file_mixedContentFromOnunload_test2.html";
+    BrowserTestUtils.loadURIString(browser, url);
+    await BrowserTestUtils.browserLoaded(browser);
+    isSecurityState(browser, "broken");
+    await assertMixedContentBlockingState(browser, {
+      activeLoaded: false,
+      activeBlocked: false,
+      passiveLoaded: true,
+    });
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_mixed_content_cert_override.js b/browser/base/content/test/siteIdentity/browser_mixed_content_cert_override.js
new file mode 100644
index 0000000000..6ca9655406
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mixed_content_cert_override.js
@@ -0,0 +1,69 @@
+/*
+ * Bug 1253771 - check mixed content blocking in combination with overriden certificates
+ */
+
+"use strict";
+
+const MIXED_CONTENT_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://self-signed.example.com"
+  ) + "test-mixedcontent-securityerrors.html";
+
+function getConnectionState() {
+  return document.getElementById("identity-popup").getAttribute("connection");
+}
+
+function getPopupContentVerifier() {
+  return document.getElementById("identity-popup-content-verifier");
+}
+
+function getIdentityIcon() {
+  return window.getComputedStyle(document.getElementById("identity-icon"))
+    .listStyleImage;
+}
+
+function checkIdentityPopup(icon) {
+  gIdentityHandler.refreshIdentityPopup();
+  is(getIdentityIcon(), `url("chrome://global/skin/icons/${icon}")`);
+  is(getConnectionState(), "secure-cert-user-overridden");
+  isnot(
+    getPopupContentVerifier().style.display,
+    "none",
+    "Overridden certificate warning is shown"
+  );
+  ok(
+    getPopupContentVerifier().textContent.includes("security exception"),
+    "Text shows overridden certificate warning."
+  );
+}
+
+add_task(async function () {
+  await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  // check that a warning is shown when loading a page with mixed content and an overridden certificate
+  await loadBadCertPage(MIXED_CONTENT_URL);
+  checkIdentityPopup("security-warning.svg");
+
+  // check that the crossed out icon is shown when disabling mixed content protection
+  gIdentityHandler.disableMixedContentProtection();
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  checkIdentityPopup("security-broken.svg");
+
+  // check that a warning is shown even without mixed content
+  BrowserTestUtils.loadURIString(
+    gBrowser.selectedBrowser,
+    "https://self-signed.example.com"
+  );
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+  checkIdentityPopup("security-warning.svg");
+
+  // remove cert exception
+  let certOverrideService = Cc[
+    "@mozilla.org/security/certoverride;1"
+  ].getService(Ci.nsICertOverrideService);
+  certOverrideService.clearValidityOverride("self-signed.example.com", -1, {});
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/base/content/test/siteIdentity/browser_mixed_content_with_navigation.js b/browser/base/content/test/siteIdentity/browser_mixed_content_with_navigation.js
new file mode 100644
index 0000000000..48171ee876
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mixed_content_with_navigation.js
@@ -0,0 +1,131 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that the site identity indicator is properly updated when loading from
+// the BF cache. This is achieved by loading a page, navigating to another page,
+// and then going "back" to the first page, as well as the reverse (loading to
+// the other page, navigating to the page we're interested in, going back, and
+// then going forward again).
+
+const kBaseURI = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+const kSecureURI = kBaseURI + "dummy_page.html";
+
+const kTestcases = [
+  {
+    uri: kBaseURI + "file_mixedPassiveContent.html",
+    expectErrorPage: false,
+    expectedIdentityMode: "mixedDisplayContent",
+  },
+  {
+    uri: kBaseURI + "file_bug1045809_1.html",
+    expectErrorPage: false,
+    expectedIdentityMode: "mixedActiveBlocked",
+  },
+  {
+    uri: "https://expired.example.com",
+    expectErrorPage: true,
+    expectedIdentityMode: "certErrorPage",
+  },
+];
+
+add_task(async function () {
+  for (let testcase of kTestcases) {
+    await run_testcase(testcase);
+  }
+});
+
+async function run_testcase(testcase) {
+  await SpecialPowers.pushPrefEnv({
+    set: [["security.mixed_content.upgrade_display_content", false]],
+  });
+  // Test the forward and back case.
+  // Start by loading an unrelated URI so that this generalizes well when the
+  // testcase would otherwise first navigate to an error page, which doesn't
+  // seem to work with withNewTab.
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    // Navigate to the test URI.
+    BrowserTestUtils.loadURIString(browser, testcase.uri);
+    if (!testcase.expectErrorPage) {
+      await BrowserTestUtils.browserLoaded(browser, false, testcase.uri);
+    } else {
+      await BrowserTestUtils.waitForErrorPage(browser);
+    }
+    let identityMode = window.document.getElementById("identity-box").classList;
+    ok(
+      identityMode.contains(testcase.expectedIdentityMode),
+      `identity should be ${testcase.expectedIdentityMode}`
+    );
+
+    // Navigate to a URI that should be secure.
+    BrowserTestUtils.loadURIString(browser, kSecureURI);
+    await BrowserTestUtils.browserLoaded(browser, false, kSecureURI);
+    let secureIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(secureIdentityMode, "verifiedDomain", "identity should be secure now");
+
+    // Go back to the test page.
+    browser.webNavigation.goBack();
+    if (!testcase.expectErrorPage) {
+      await BrowserTestUtils.browserStopped(browser, testcase.uri);
+    } else {
+      await BrowserTestUtils.waitForErrorPage(browser);
+    }
+    let identityModeAgain =
+      window.document.getElementById("identity-box").classList;
+    ok(
+      identityModeAgain.contains(testcase.expectedIdentityMode),
+      `identity should again be ${testcase.expectedIdentityMode}`
+    );
+  });
+
+  // Test the back and forward case.
+  // Start on a secure page.
+  await BrowserTestUtils.withNewTab(kSecureURI, async browser => {
+    let secureIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(secureIdentityMode, "verifiedDomain", "identity should start as secure");
+
+    // Navigate to the test URI.
+    BrowserTestUtils.loadURIString(browser, testcase.uri);
+    if (!testcase.expectErrorPage) {
+      await BrowserTestUtils.browserLoaded(browser, false, testcase.uri);
+    } else {
+      await BrowserTestUtils.waitForErrorPage(browser);
+    }
+    let identityMode = window.document.getElementById("identity-box").classList;
+    ok(
+      identityMode.contains(testcase.expectedIdentityMode),
+      `identity should be ${testcase.expectedIdentityMode}`
+    );
+
+    // Go back to the secure page.
+    browser.webNavigation.goBack();
+    await BrowserTestUtils.browserStopped(browser, kSecureURI);
+    let secureIdentityModeAgain =
+      window.document.getElementById("identity-box").className;
+    is(
+      secureIdentityModeAgain,
+      "verifiedDomain",
+      "identity should be secure again"
+    );
+
+    // Go forward again to the test URI.
+    browser.webNavigation.goForward();
+    if (!testcase.expectErrorPage) {
+      await BrowserTestUtils.browserStopped(browser, testcase.uri);
+    } else {
+      await BrowserTestUtils.waitForErrorPage(browser);
+    }
+    let identityModeAgain =
+      window.document.getElementById("identity-box").classList;
+    ok(
+      identityModeAgain.contains(testcase.expectedIdentityMode),
+      `identity should again be ${testcase.expectedIdentityMode}`
+    );
+  });
+}
diff --git a/browser/base/content/test/siteIdentity/browser_mixed_passive_content_indicator.js b/browser/base/content/test/siteIdentity/browser_mixed_passive_content_indicator.js
new file mode 100644
index 0000000000..909764c597
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mixed_passive_content_indicator.js
@@ -0,0 +1,18 @@
+const TEST_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "simple_mixed_passive.html";
+
+add_task(async function test_mixed_passive_content_indicator() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["security.mixed_content.upgrade_display_content", false]],
+  });
+  await BrowserTestUtils.withNewTab(TEST_URL, function () {
+    is(
+      document.getElementById("identity-box").className,
+      "unknownIdentity mixedDisplayContent",
+      "identity box has class name for mixed content"
+    );
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_mixedcontent_securityflags.js b/browser/base/content/test/siteIdentity/browser_mixedcontent_securityflags.js
new file mode 100644
index 0000000000..3e39426c51
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_mixedcontent_securityflags.js
@@ -0,0 +1,71 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// The test loads a web page with mixed active and mixed display content and
+// makes sure that the mixed content flags on the docshell are set correctly.
+// * Using default about:config prefs (mixed active blocked, mixed display
+//   loaded) we load the page and check the flags.
+// * We change the about:config prefs (mixed active blocked, mixed display
+//   blocked), reload the page, and check the flags again.
+// * We override protection so all mixed content can load and check the
+//   flags again.
+
+const TEST_URI =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "test-mixedcontent-securityerrors.html";
+const PREF_DISPLAY = "security.mixed_content.block_display_content";
+const PREF_DISPLAY_UPGRADE = "security.mixed_content.upgrade_display_content";
+const PREF_ACTIVE = "security.mixed_content.block_active_content";
+var gTestBrowser = null;
+
+registerCleanupFunction(function () {
+  // Set preferences back to their original values
+  Services.prefs.clearUserPref(PREF_DISPLAY);
+  Services.prefs.clearUserPref(PREF_DISPLAY_UPGRADE);
+  Services.prefs.clearUserPref(PREF_ACTIVE);
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function blockMixedActiveContentTest() {
+  // Turn on mixed active blocking and mixed display loading and load the page.
+  Services.prefs.setBoolPref(PREF_DISPLAY, false);
+  Services.prefs.setBoolPref(PREF_DISPLAY_UPGRADE, false);
+  Services.prefs.setBoolPref(PREF_ACTIVE, true);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URI);
+  gTestBrowser = gBrowser.getBrowserForTab(tab);
+
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: true,
+  });
+
+  // Turn on mixed active and mixed display blocking and reload the page.
+  Services.prefs.setBoolPref(PREF_DISPLAY, true);
+  Services.prefs.setBoolPref(PREF_ACTIVE, true);
+
+  gBrowser.reload();
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: false,
+    activeBlocked: true,
+    passiveLoaded: false,
+  });
+});
+
+add_task(async function overrideMCB() {
+  // Disable mixed content blocking (reloads page) and retest
+  let { gIdentityHandler } = gTestBrowser.ownerGlobal;
+  gIdentityHandler.disableMixedContentProtection();
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+
+  await assertMixedContentBlockingState(gTestBrowser, {
+    activeLoaded: true,
+    activeBlocked: false,
+    passiveLoaded: true,
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_navigation_failures.js b/browser/base/content/test/siteIdentity/browser_navigation_failures.js
new file mode 100644
index 0000000000..ddb0d93fab
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_navigation_failures.js
@@ -0,0 +1,166 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that the site identity indicator is properly updated for navigations
+// that fail for various reasons. In particular, we currently test TLS handshake
+// failures, about: pages that don't actually exist, and situations where the
+// TLS handshake completes but the server then closes the connection.
+// See bug 1492424, bug 1493427, and bug 1391207.
+
+const kSecureURI =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "dummy_page.html";
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(kSecureURI, async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "verifiedDomain", "identity should be secure before");
+
+    const TLS_HANDSHAKE_FAILURE_URI = "https://ssl3.example.com/";
+    // Try to connect to a server where the TLS handshake will fail.
+    BrowserTestUtils.loadURIString(browser, TLS_HANDSHAKE_FAILURE_URI);
+    await BrowserTestUtils.browserLoaded(
+      browser,
+      false,
+      TLS_HANDSHAKE_FAILURE_URI,
+      true
+    );
+
+    let newIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(
+      newIdentityMode,
+      "certErrorPage notSecureText",
+      "identity should be unknown (not secure) after"
+    );
+  });
+});
+
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(kSecureURI, async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "verifiedDomain", "identity should be secure before");
+
+    const BAD_ABOUT_PAGE_URI = "about:somethingthatdoesnotexist";
+    // Try to load an about: page that doesn't exist
+    BrowserTestUtils.loadURIString(browser, BAD_ABOUT_PAGE_URI);
+    await BrowserTestUtils.browserLoaded(
+      browser,
+      false,
+      BAD_ABOUT_PAGE_URI,
+      true
+    );
+
+    let newIdentityMode =
+      window.document.getElementById("identity-box").className;
+    is(
+      newIdentityMode,
+      "unknownIdentity",
+      "identity should be unknown (not secure) after"
+    );
+  });
+});
+
+// Helper function to start a TLS server that will accept a connection, complete
+// the TLS handshake, but then close the connection.
+function startServer(cert) {
+  let tlsServer = Cc["@mozilla.org/network/tls-server-socket;1"].createInstance(
+    Ci.nsITLSServerSocket
+  );
+  tlsServer.init(-1, true, -1);
+  tlsServer.serverCert = cert;
+
+  let input, output;
+
+  let listener = {
+    onSocketAccepted(socket, transport) {
+      let connectionInfo = transport.securityCallbacks.getInterface(
+        Ci.nsITLSServerConnectionInfo
+      );
+      connectionInfo.setSecurityObserver(listener);
+      input = transport.openInputStream(0, 0, 0);
+      output = transport.openOutputStream(0, 0, 0);
+    },
+
+    onHandshakeDone(socket, status) {
+      input.asyncWait(
+        {
+          onInputStreamReady(readyInput) {
+            try {
+              input.close();
+              output.close();
+            } catch (e) {
+              info(e);
+            }
+          },
+        },
+        0,
+        0,
+        Services.tm.currentThread
+      );
+    },
+
+    onStopListening() {},
+  };
+
+  tlsServer.setSessionTickets(false);
+  tlsServer.asyncListen(listener);
+
+  return tlsServer;
+}
+
+// Test that if we complete a TLS handshake but the server closes the connection
+// just after doing so (resulting in a "connection reset" error page), the site
+// identity information gets updated appropriately (it should indicate "not
+// secure").
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    // This test fails on some platforms if we leave IPv6 enabled.
+    set: [["network.dns.disableIPv6", true]],
+  });
+
+  let certOverrideService = Cc[
+    "@mozilla.org/security/certoverride;1"
+  ].getService(Ci.nsICertOverrideService);
+
+  let cert = getTestServerCertificate();
+  // Start a server and trust its certificate.
+  let server = startServer(cert);
+  certOverrideService.rememberValidityOverride(
+    "localhost",
+    server.port,
+    {},
+    cert,
+    true
+  );
+
+  // Un-do configuration changes we've made when the test is done.
+  registerCleanupFunction(() => {
+    certOverrideService.clearValidityOverride("localhost", server.port, {});
+    server.close();
+  });
+
+  // Open up a new tab...
+  await BrowserTestUtils.withNewTab("about:blank", async browser => {
+    const TLS_HANDSHAKE_FAILURE_URI = `https://localhost:${server.port}/`;
+    // Try to connect to a server where the TLS handshake will succeed, but then
+    // the server closes the connection right after.
+    BrowserTestUtils.loadURIString(browser, TLS_HANDSHAKE_FAILURE_URI);
+    await BrowserTestUtils.browserLoaded(
+      browser,
+      false,
+      TLS_HANDSHAKE_FAILURE_URI,
+      true
+    );
+
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(
+      identityMode,
+      "certErrorPage notSecureText",
+      "identity should be 'unknown'"
+    );
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_no_mcb_for_loopback.js b/browser/base/content/test/siteIdentity/browser_no_mcb_for_loopback.js
new file mode 100644
index 0000000000..1c854e2849
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_no_mcb_for_loopback.js
@@ -0,0 +1,88 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// The test loads a HTTPS web page with active content from HTTP loopback URLs
+// and makes sure that the mixed content flags on the docshell are not set.
+//
+// Note that the URLs referenced within the test page intentionally use the
+// unassigned port 8 because we don't want to actually load anything, we just
+// want to check that the URLs are not blocked.
+
+// The following rejections should not be left uncaught. This test has been
+// whitelisted until the issue is fixed.
+if (!gMultiProcessBrowser) {
+  const { PromiseTestUtils } = ChromeUtils.importESModule(
+    "resource://testing-common/PromiseTestUtils.sys.mjs"
+  );
+  PromiseTestUtils.expectUncaughtRejection(/NetworkError/);
+  PromiseTestUtils.expectUncaughtRejection(/NetworkError/);
+}
+
+const TEST_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "test_no_mcb_for_loopback.html";
+
+const LOOPBACK_PNG_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "http://127.0.0.1:8888"
+  ) + "moz.png";
+
+const PREF_BLOCK_DISPLAY = "security.mixed_content.block_display_content";
+const PREF_UPGRADE_DISPLAY = "security.mixed_content.upgrade_display_content";
+const PREF_BLOCK_ACTIVE = "security.mixed_content.block_active_content";
+
+function clearAllImageCaches() {
+  let tools = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools);
+  let imageCache = tools.getImgCacheForDocument(window.document);
+  imageCache.clearCache(true); // true=chrome
+  imageCache.clearCache(false); // false=content
+}
+
+registerCleanupFunction(function () {
+  clearAllImageCaches();
+  Services.prefs.clearUserPref(PREF_BLOCK_DISPLAY);
+  Services.prefs.clearUserPref(PREF_UPGRADE_DISPLAY);
+  Services.prefs.clearUserPref(PREF_BLOCK_ACTIVE);
+  gBrowser.removeCurrentTab();
+});
+
+add_task(async function allowLoopbackMixedContent() {
+  Services.prefs.setBoolPref(PREF_BLOCK_DISPLAY, true);
+  Services.prefs.setBoolPref(PREF_UPGRADE_DISPLAY, false);
+  Services.prefs.setBoolPref(PREF_BLOCK_ACTIVE, true);
+
+  const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+  const browser = gBrowser.getBrowserForTab(tab);
+
+  // Check that loopback content served from the cache is not blocked.
+  await SpecialPowers.spawn(
+    browser,
+    [LOOPBACK_PNG_URL],
+    async function (loopbackPNGUrl) {
+      const doc = content.document;
+      const img = doc.createElement("img");
+      const promiseImgLoaded = ContentTaskUtils.waitForEvent(
+        img,
+        "load",
+        false
+      );
+      img.src = loopbackPNGUrl;
+      Assert.ok(!img.complete, "loopback image not yet loaded");
+      doc.body.appendChild(img);
+      await promiseImgLoaded;
+
+      const cachedImg = doc.createElement("img");
+      cachedImg.src = img.src;
+      Assert.ok(cachedImg.complete, "loopback image loaded from cache");
+    }
+  );
+
+  await assertMixedContentBlockingState(browser, {
+    activeBlocked: false,
+    activeLoaded: false,
+    passiveLoaded: false,
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_no_mcb_for_onions.js b/browser/base/content/test/siteIdentity/browser_no_mcb_for_onions.js
new file mode 100644
index 0000000000..4a5c65b125
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_no_mcb_for_onions.js
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// The test loads a HTTPS web page with active content from HTTP .onion URLs
+// and makes sure that the mixed content flags on the docshell are not set.
+//
+// Note that the URLs referenced within the test page intentionally use the
+// unassigned port 8 because we don't want to actually load anything, we just
+// want to check that the URLs are not blocked.
+
+const TEST_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "test_no_mcb_for_onions.html";
+
+const PREF_BLOCK_DISPLAY = "security.mixed_content.block_display_content";
+const PREF_BLOCK_ACTIVE = "security.mixed_content.block_active_content";
+const PREF_ONION_ALLOWLIST = "dom.securecontext.allowlist_onions";
+
+add_task(async function allowOnionMixedContent() {
+  registerCleanupFunction(function () {
+    gBrowser.removeCurrentTab();
+  });
+
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_BLOCK_DISPLAY, true]] });
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_BLOCK_ACTIVE, true]] });
+  await SpecialPowers.pushPrefEnv({ set: [[PREF_ONION_ALLOWLIST, true]] });
+
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    TEST_URL
+  ).catch(console.error);
+  const browser = gBrowser.getBrowserForTab(tab);
+
+  await assertMixedContentBlockingState(browser, {
+    activeBlocked: false,
+    activeLoaded: false,
+    passiveLoaded: false,
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_no_mcb_on_http_site.js b/browser/base/content/test/siteIdentity/browser_no_mcb_on_http_site.js
new file mode 100644
index 0000000000..30caae4ea5
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_no_mcb_on_http_site.js
@@ -0,0 +1,133 @@
+/*
+ * Description of the Tests for
+ *  - Bug 909920 - Mixed content warning should not show on a HTTP site
+ *
+ * Description of the tests:
+ *   Test 1:
+ *     1) Load an http page
+ *     2) The page includes a css file using https
+ *     3) The css file loads an |IMAGE| << over http
+ *
+ *   Test 2:
+ *     1) Load an http page
+ *     2) The page includes a css file using https
+ *     3) The css file loads a |FONT| over http
+ *
+ *   Test 3:
+ *     1) Load an http page
+ *     2) The page includes a css file using https
+ *     3) The css file imports (@import) another css file using http
+ *     3) The imported css file loads a |FONT| over http
+ *
+ * Since the top-domain is >> NOT << served using https, the MCB
+ * should >> NOT << trigger a warning.
+ */
+
+const PREF_ACTIVE = "security.mixed_content.block_active_content";
+const PREF_DISPLAY = "security.mixed_content.block_display_content";
+
+const HTTP_TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  "http://example.com"
+);
+
+var gTestBrowser = null;
+
+function cleanUpAfterTests() {
+  gBrowser.removeCurrentTab();
+  window.focus();
+}
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      [PREF_ACTIVE, true],
+      [PREF_DISPLAY, true],
+    ],
+  });
+  let url = HTTP_TEST_ROOT + "test_no_mcb_on_http_site_img.html";
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, url);
+  gTestBrowser = tab.linkedBrowser;
+});
+
+// ------------- TEST 1 -----------------------------------------
+
+add_task(async function test1() {
+  let expected =
+    "Verifying MCB does not trigger warning/error for an http page ";
+  expected += "with https css that includes http image";
+
+  await SpecialPowers.spawn(
+    gTestBrowser,
+    [expected],
+    async function (condition) {
+      await ContentTaskUtils.waitForCondition(
+        () => content.document.getElementById("testDiv").innerHTML == condition,
+        "Waited too long for status in Test 1!"
+      );
+    }
+  );
+
+  // Explicit OKs needed because the harness requires at least one call to ok.
+  ok(true, "test 1 passed");
+
+  // set up test 2
+  let url = HTTP_TEST_ROOT + "test_no_mcb_on_http_site_font.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+// ------------- TEST 2 -----------------------------------------
+
+add_task(async function test2() {
+  let expected =
+    "Verifying MCB does not trigger warning/error for an http page ";
+  expected += "with https css that includes http font";
+
+  await SpecialPowers.spawn(
+    gTestBrowser,
+    [expected],
+    async function (condition) {
+      await ContentTaskUtils.waitForCondition(
+        () => content.document.getElementById("testDiv").innerHTML == condition,
+        "Waited too long for status in Test 2!"
+      );
+    }
+  );
+
+  ok(true, "test 2 passed");
+
+  // set up test 3
+  let url = HTTP_TEST_ROOT + "test_no_mcb_on_http_site_font2.html";
+  BrowserTestUtils.loadURIString(gTestBrowser, url);
+  await BrowserTestUtils.browserLoaded(gTestBrowser);
+});
+
+// ------------- TEST 3 -----------------------------------------
+
+add_task(async function test3() {
+  let expected =
+    "Verifying MCB does not trigger warning/error for an http page ";
+  expected +=
+    "with https css that imports another http css which includes http font";
+
+  await SpecialPowers.spawn(
+    gTestBrowser,
+    [expected],
+    async function (condition) {
+      await ContentTaskUtils.waitForCondition(
+        () => content.document.getElementById("testDiv").innerHTML == condition,
+        "Waited too long for status in Test 3!"
+      );
+    }
+  );
+
+  ok(true, "test3 passed");
+});
+
+// ------------------------------------------------------
+
+add_task(async function cleanup() {
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});
diff --git a/browser/base/content/test/siteIdentity/browser_secure_transport_insecure_scheme.js b/browser/base/content/test/siteIdentity/browser_secure_transport_insecure_scheme.js
new file mode 100644
index 0000000000..1d282ef6de
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_secure_transport_insecure_scheme.js
@@ -0,0 +1,185 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that an insecure resource routed over a secure transport is considered
+// insecure in terms of the site identity panel. We achieve this by running an
+// HTTP-over-TLS "proxy" and having Firefox request an http:// URI over it.
+
+/**
+ * Tests that the page info dialog "security" section labels a
+ * connection as unencrypted and does not show certificate.
+ * @param {string} uri - URI of the page to test with.
+ */
+async function testPageInfoNotEncrypted(uri) {
+  let pageInfo = BrowserPageInfo(uri, "securityTab");
+  await BrowserTestUtils.waitForEvent(pageInfo, "load");
+  let pageInfoDoc = pageInfo.document;
+  let securityTab = pageInfoDoc.getElementById("securityTab");
+  await TestUtils.waitForCondition(
+    () => BrowserTestUtils.is_visible(securityTab),
+    "Security tab should be visible."
+  );
+
+  let secLabel = pageInfoDoc.getElementById("security-technical-shortform");
+  await TestUtils.waitForCondition(
+    () => secLabel.value == "Connection Not Encrypted",
+    "pageInfo 'Security Details' should show not encrypted"
+  );
+
+  let viewCertBtn = pageInfoDoc.getElementById("security-view-cert");
+  ok(
+    viewCertBtn.collapsed,
+    "pageInfo 'View Cert' button should not be visible"
+  );
+  pageInfo.close();
+}
+
+// But first, a quick test that we don't incorrectly treat a
+// blob:https://example.com URI as secure.
+add_task(async function () {
+  let uri =
+    getRootDirectory(gTestPath).replace(
+      "chrome://mochitests/content",
+      "https://example.com"
+    ) + "dummy_page.html";
+  await BrowserTestUtils.withNewTab(uri, async browser => {
+    await SpecialPowers.spawn(browser, [], async () => {
+      let debug = { hello: "world" };
+      let blob = new Blob([JSON.stringify(debug, null, 2)], {
+        type: "application/json",
+      });
+      let blobUri = URL.createObjectURL(blob);
+      content.document.location = blobUri;
+    });
+    await BrowserTestUtils.browserLoaded(browser);
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "localResource", "identity should be 'localResource'");
+    await testPageInfoNotEncrypted(uri);
+  });
+});
+
+// This server pretends to be a HTTP over TLS proxy. It isn't really, but this
+// is sufficient for the purposes of this test.
+function startServer(cert) {
+  let tlsServer = Cc["@mozilla.org/network/tls-server-socket;1"].createInstance(
+    Ci.nsITLSServerSocket
+  );
+  tlsServer.init(-1, true, -1);
+  tlsServer.serverCert = cert;
+
+  let input, output;
+
+  let listener = {
+    onSocketAccepted(socket, transport) {
+      let connectionInfo = transport.securityCallbacks.getInterface(
+        Ci.nsITLSServerConnectionInfo
+      );
+      connectionInfo.setSecurityObserver(listener);
+      input = transport.openInputStream(0, 0, 0);
+      output = transport.openOutputStream(0, 0, 0);
+    },
+
+    onHandshakeDone(socket, status) {
+      input.asyncWait(
+        {
+          onInputStreamReady(readyInput) {
+            try {
+              let request = NetUtil.readInputStreamToString(
+                readyInput,
+                readyInput.available()
+              );
+              ok(
+                request.startsWith("GET ") && request.includes("HTTP/1.1"),
+                "expecting an HTTP/1.1 GET request"
+              );
+              let response =
+                "HTTP/1.1 200 OK\r\nContent-Type:text/plain\r\n" +
+                "Connection:Close\r\nContent-Length:2\r\n\r\nOK";
+              output.write(response, response.length);
+            } catch (e) {
+              info(e);
+            }
+          },
+        },
+        0,
+        0,
+        Services.tm.currentThread
+      );
+    },
+
+    onStopListening() {
+      input.close();
+      output.close();
+    },
+  };
+
+  tlsServer.setSessionTickets(false);
+  tlsServer.asyncListen(listener);
+
+  return tlsServer;
+}
+
+add_task(async function () {
+  await SpecialPowers.pushPrefEnv({
+    // This test fails on some platforms if we leave IPv6 enabled.
+    set: [["network.dns.disableIPv6", true]],
+  });
+
+  let certOverrideService = Cc[
+    "@mozilla.org/security/certoverride;1"
+  ].getService(Ci.nsICertOverrideService);
+
+  let cert = getTestServerCertificate();
+  // Start the proxy and configure Firefox to trust its certificate.
+  let server = startServer(cert);
+  certOverrideService.rememberValidityOverride(
+    "localhost",
+    server.port,
+    {},
+    cert,
+    true
+  );
+  // Configure Firefox to use the proxy.
+  let systemProxySettings = {
+    QueryInterface: ChromeUtils.generateQI(["nsISystemProxySettings"]),
+    mainThreadOnly: true,
+    PACURI: null,
+    getProxyForURI: (aSpec, aScheme, aHost, aPort) => {
+      return `HTTPS localhost:${server.port}`;
+    },
+  };
+  let oldProxyType = Services.prefs.getIntPref("network.proxy.type");
+  Services.prefs.setIntPref(
+    "network.proxy.type",
+    Ci.nsIProtocolProxyService.PROXYCONFIG_SYSTEM
+  );
+  let { MockRegistrar } = ChromeUtils.importESModule(
+    "resource://testing-common/MockRegistrar.sys.mjs"
+  );
+  let mockProxy = MockRegistrar.register(
+    "@mozilla.org/system-proxy-settings;1",
+    systemProxySettings
+  );
+  // Register cleanup to undo the configuration changes we've made.
+  registerCleanupFunction(() => {
+    certOverrideService.clearValidityOverride("localhost", server.port, {});
+    Services.prefs.setIntPref("network.proxy.type", oldProxyType);
+    MockRegistrar.unregister(mockProxy);
+    server.close();
+  });
+
+  // Navigate to 'http://example.com'. Our proxy settings will route this via
+  // the "proxy" we just started. Even though our connection to the proxy is
+  // secure, in a real situation the connection from the proxy to
+  // http://example.com won't be secure, so we treat it as not secure.
+  // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+  await BrowserTestUtils.withNewTab("http://example.com/", async browser => {
+    let identityMode = window.document.getElementById("identity-box").className;
+    is(identityMode, "notSecure", "identity should be 'not secure'");
+
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    await testPageInfoNotEncrypted("http://example.com");
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/browser_session_store_pageproxystate.js b/browser/base/content/test/siteIdentity/browser_session_store_pageproxystate.js
new file mode 100644
index 0000000000..5d8c011727
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_session_store_pageproxystate.js
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const triggeringPrincipal_base64 = E10SUtils.SERIALIZED_SYSTEMPRINCIPAL;
+
+let origBrowserState = SessionStore.getBrowserState();
+
+add_setup(async function () {
+  registerCleanupFunction(() => {
+    SessionStore.setBrowserState(origBrowserState);
+  });
+});
+
+// Test that when restoring tabs via SessionStore, we directly show the correct
+// security state.
+add_task(async function test_session_store_security_state() {
+  const state = {
+    windows: [
+      {
+        tabs: [
+          {
+            entries: [
+              { url: "https://example.net", triggeringPrincipal_base64 },
+            ],
+          },
+          {
+            entries: [
+              { url: "https://example.org", triggeringPrincipal_base64 },
+            ],
+          },
+        ],
+        selected: 1,
+      },
+    ],
+  };
+
+  // Create a promise that resolves when the tabs have finished restoring.
+  let promiseTabsRestored = Promise.all([
+    TestUtils.topicObserved("sessionstore-browser-state-restored"),
+    BrowserTestUtils.waitForEvent(gBrowser.tabContainer, "SSTabRestored"),
+  ]);
+
+  SessionStore.setBrowserState(JSON.stringify(state));
+
+  await promiseTabsRestored;
+
+  is(gBrowser.selectedTab, gBrowser.tabs[0], "First tab is selected initially");
+
+  info("Switch to second tab which has not been loaded yet.");
+  BrowserTestUtils.switchTab(gBrowser, gBrowser.tabs[1]);
+  is(
+    gURLBar.textbox.getAttribute("pageproxystate"),
+    "invalid",
+    "Page proxy state is invalid after tab switch"
+  );
+
+  // Wait for valid pageproxystate. As soon as we have a valid pageproxystate,
+  // showing the identity box, it should indicate a secure connection.
+  await BrowserTestUtils.waitForMutationCondition(
+    gURLBar.textbox,
+    {
+      attributeFilter: ["pageproxystate"],
+    },
+    () => gURLBar.textbox.getAttribute("pageproxystate") == "valid"
+  );
+
+  // Wait for a tick for security state to apply.
+  await new Promise(resolve => setTimeout(resolve, 0));
+
+  is(
+    gBrowser.currentURI.spec,
+    "https://example.org/",
+    "Should have loaded example.org"
+  );
+  is(
+    gIdentityHandler._identityBox.getAttribute("pageproxystate"),
+    "valid",
+    "identityBox pageproxystate is valid"
+  );
+
+  ok(
+    gIdentityHandler._isSecureConnection,
+    "gIdentityHandler._isSecureConnection is true"
+  );
+  is(
+    gIdentityHandler._identityBox.className,
+    "verifiedDomain",
+    "identityBox class signals secure connection."
+  );
+});
diff --git a/browser/base/content/test/siteIdentity/browser_tab_sharing_state.js b/browser/base/content/test/siteIdentity/browser_tab_sharing_state.js
new file mode 100644
index 0000000000..6c6ba57c55
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/browser_tab_sharing_state.js
@@ -0,0 +1,96 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests gBrowser#updateBrowserSharing
+ */
+add_task(async function testBrowserSharingStateSetter() {
+  const WEBRTC_TEST_STATE = {
+    camera: 0,
+    microphone: 1,
+    paused: false,
+    sharing: "microphone",
+    showMicrophoneIndicator: true,
+    showScreenSharingIndicator: "",
+    windowId: 0,
+  };
+
+  const WEBRTC_TEST_STATE2 = {
+    camera: 1,
+    microphone: 1,
+    paused: false,
+    sharing: "camera",
+    showCameraIndicator: true,
+    showMicrophoneIndicator: true,
+    showScreenSharingIndicator: "",
+    windowId: 1,
+  };
+
+  await BrowserTestUtils.withNewTab("https://example.com", async browser => {
+    let tab = gBrowser.selectedTab;
+    is(tab._sharingState, undefined, "No sharing state initially.");
+    ok(!tab.hasAttribute("sharing"), "No tab sharing attribute initially.");
+
+    // Set an active sharing state for webrtc
+    gBrowser.updateBrowserSharing(browser, { webRTC: WEBRTC_TEST_STATE });
+    Assert.deepEqual(
+      tab._sharingState,
+      { webRTC: WEBRTC_TEST_STATE },
+      "Should have correct webRTC sharing state."
+    );
+    is(
+      tab.getAttribute("sharing"),
+      WEBRTC_TEST_STATE.sharing,
+      "Tab sharing attribute reflects webRTC sharing state."
+    );
+
+    // Set sharing state for geolocation
+    gBrowser.updateBrowserSharing(browser, { geo: true });
+    Assert.deepEqual(
+      tab._sharingState,
+      {
+        webRTC: WEBRTC_TEST_STATE,
+        geo: true,
+      },
+      "Should have sharing state for both webRTC and geolocation."
+    );
+    is(
+      tab.getAttribute("sharing"),
+      WEBRTC_TEST_STATE.sharing,
+      "Geolocation sharing doesn't update the tab sharing attribute."
+    );
+
+    // Update webRTC sharing state
+    gBrowser.updateBrowserSharing(browser, { webRTC: WEBRTC_TEST_STATE2 });
+    Assert.deepEqual(
+      tab._sharingState,
+      { geo: true, webRTC: WEBRTC_TEST_STATE2 },
+      "Should have updated webRTC sharing state while maintaining geolocation state."
+    );
+    is(
+      tab.getAttribute("sharing"),
+      WEBRTC_TEST_STATE2.sharing,
+      "Tab sharing attribute reflects webRTC sharing state."
+    );
+
+    // Clear webRTC sharing state
+    gBrowser.updateBrowserSharing(browser, { webRTC: null });
+    Assert.deepEqual(
+      tab._sharingState,
+      { geo: true, webRTC: null },
+      "Should only have sharing state for geolocation."
+    );
+    ok(
+      !tab.hasAttribute("sharing"),
+      "Ending webRTC sharing should remove tab sharing attribute."
+    );
+
+    // Clear geolocation sharing state
+    gBrowser.updateBrowserSharing(browser, { geo: null });
+    Assert.deepEqual(tab._sharingState, { geo: null, webRTC: null });
+    ok(
+      !tab.hasAttribute("sharing"),
+      "Tab sharing attribute should not be set."
+    );
+  });
+});
diff --git a/browser/base/content/test/siteIdentity/dummy_iframe_page.html b/browser/base/content/test/siteIdentity/dummy_iframe_page.html
new file mode 100644
index 0000000000..ea80367aa5
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/dummy_iframe_page.html
@@ -0,0 +1,10 @@
+<html>
+<head>
+<title>Dummy iframe test page</title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8"></meta>
+</head>
+<body>
+  <iframe src="https://example.org"></iframe>
+<p>Dummy test page</p>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/dummy_page.html b/browser/base/content/test/siteIdentity/dummy_page.html
new file mode 100644
index 0000000000..a7747a0bca
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/dummy_page.html
@@ -0,0 +1,10 @@
+<html>
+<head>
+<title>Dummy test page</title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8"></meta>
+</head>
+<body>
+  <a href="https://nocert.example.com" id="no-cert">No Cert page</a>
+<p>Dummy test page</p>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug1045809_1.html b/browser/base/content/test/siteIdentity/file_bug1045809_1.html
new file mode 100644
index 0000000000..c4f281d670
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug1045809_1.html
@@ -0,0 +1,7 @@
+<html>
+  <head>
+  </head>
+  <body>
+    <iframe src="http://test1.example.com/browser/browser/base/content/test/siteIdentity/file_bug1045809_2.html"></iframe>
+  </body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug1045809_2.html b/browser/base/content/test/siteIdentity/file_bug1045809_2.html
new file mode 100644
index 0000000000..67a297dbc5
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug1045809_2.html
@@ -0,0 +1,7 @@
+<html>
+  <head>
+  </head>
+  <body>
+    <div id="mixedContentContainer">Mixed Content is here</div>
+  </body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_1.html b/browser/base/content/test/siteIdentity/file_bug822367_1.html
new file mode 100644
index 0000000000..a6e3fafc23
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_1.html
@@ -0,0 +1,18 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 1 for Mixed Content Blocker User Override - Mixed Script
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 1 for Bug 822367</title>
+</head>
+<body>
+  <div id="testContent">
+    <p id="p1"></p>
+  </div>
+  <script src="http://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_1.js">
+  </script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_1.js b/browser/base/content/test/siteIdentity/file_bug822367_1.js
new file mode 100644
index 0000000000..e4b5fb86c6
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_1.js
@@ -0,0 +1 @@
+document.getElementById("p1").innerHTML = "hello";
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_2.html b/browser/base/content/test/siteIdentity/file_bug822367_2.html
new file mode 100644
index 0000000000..fe56ee2130
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_2.html
@@ -0,0 +1,16 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 2 for Mixed Content Blocker User Override - Mixed Display
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 2 for Bug 822367 - Mixed Display</title>
+</head>
+<body>
+  <div id="testContent">
+    <img src="http://example.com/tests/image/test/mochitest/blue.png">
+  </div>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_3.html b/browser/base/content/test/siteIdentity/file_bug822367_3.html
new file mode 100644
index 0000000000..0cf5db7b20
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_3.html
@@ -0,0 +1,27 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 3 for Mixed Content Blocker User Override - Mixed Script and Display
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 3 for Bug 822367</title>
+  <script>
+  function foo() {
+    var x = document.createElement("p");
+    x.setAttribute("id", "p2");
+    x.innerHTML = "bye";
+    document.getElementById("testContent").appendChild(x);
+  }
+  </script>
+</head>
+<body>
+  <div id="testContent">
+    <p id="p1"></p>
+    <img src="http://example.com/tests/image/test/mochitest/blue.png" onload="foo()">
+  </div>
+  <script src="http://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_1.js">
+  </script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_4.html b/browser/base/content/test/siteIdentity/file_bug822367_4.html
new file mode 100644
index 0000000000..8e5aeb67f2
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_4.html
@@ -0,0 +1,18 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 4 for Mixed Content Blocker User Override - Mixed Script and Display
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 4 for Bug 822367</title>
+</head>
+<body>
+  <div id="testContent">
+    <p id="p1"></p>
+  </div>
+  <script src="http://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_4.js">
+  </script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_4.js b/browser/base/content/test/siteIdentity/file_bug822367_4.js
new file mode 100644
index 0000000000..8bdc791180
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_4.js
@@ -0,0 +1,2 @@
+document.location =
+  "https://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_4B.html";
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_4B.html b/browser/base/content/test/siteIdentity/file_bug822367_4B.html
new file mode 100644
index 0000000000..9af942525f
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_4B.html
@@ -0,0 +1,18 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 4B for Mixed Content Blocker User Override - Location Changed
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 4B Location Change for Bug 822367</title>
+</head>
+<body>
+  <div id="testContent">
+    <p id="p1"></p>
+  </div>
+  <script src="http://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_1.js">
+  </script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_5.html b/browser/base/content/test/siteIdentity/file_bug822367_5.html
new file mode 100644
index 0000000000..6341539e83
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_5.html
@@ -0,0 +1,23 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 5 for Mixed Content Blocker User Override - Mixed Script in document.open()
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 5 for Bug 822367</title>
+  <script>
+    function createDoc() {
+      var doc = document.open("text/html", "replace");
+      doc.write('<!DOCTYPE html><html><body><p id="p1">This is some content</p><script src="http://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_1.js">\<\/script\>\<\/body>\<\/html>');
+      doc.close();
+    }
+  </script>
+</head>
+<body>
+  <div id="testContent">
+    <img src="https://example.com/tests/image/test/mochitest/blue.png" onload="createDoc()">
+  </div>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug822367_6.html b/browser/base/content/test/siteIdentity/file_bug822367_6.html
new file mode 100644
index 0000000000..2c071a785d
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug822367_6.html
@@ -0,0 +1,16 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 6 for Mixed Content Blocker User Override - Mixed Script in document.open() within an iframe
+https://bugzilla.mozilla.org/show_bug.cgi?id=822367
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 6 for Bug 822367</title>
+</head>
+<body>
+  <div id="testContent">
+    <iframe name="f1" id="f1" src="https://example.com/browser/browser/base/content/test/siteIdentity/file_bug822367_5.html"></iframe>
+  </div>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug902156.js b/browser/base/content/test/siteIdentity/file_bug902156.js
new file mode 100644
index 0000000000..01ef4073fb
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug902156.js
@@ -0,0 +1,6 @@
+/*
+ * Once the mixed content blocker is disabled for the page, this scripts loads
+ * and updates the text inside the div container.
+ */
+document.getElementById("mctestdiv").innerHTML =
+  "Mixed Content Blocker disabled";
diff --git a/browser/base/content/test/siteIdentity/file_bug902156_1.html b/browser/base/content/test/siteIdentity/file_bug902156_1.html
new file mode 100644
index 0000000000..4cac7cfb93
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug902156_1.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 1 for Bug 902156 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=902156
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 1 for Bug 902156</title>
+</head>
+<body>
+  <div id="mctestdiv">Mixed Content Blocker enabled</div>
+  <script src="http://test1.example.com/browser/browser/base/content/test/siteIdentity/file_bug902156.js" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug902156_2.html b/browser/base/content/test/siteIdentity/file_bug902156_2.html
new file mode 100644
index 0000000000..c815a09a93
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug902156_2.html
@@ -0,0 +1,17 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 2 for Bug 902156 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=902156
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 2 for Bug 902156</title>
+</head>
+<body>
+  <div id="mctestdiv">Mixed Content Blocker enabled</div>
+  <a href="https://test2.example.com/browser/browser/base/content/test/siteIdentity/file_bug902156_1.html"
+     id="mctestlink" target="_top">Go to http site</a>
+  <script src="http://test2.example.com/browser/browser/base/content/test/siteIdentity/file_bug902156.js" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug902156_3.html b/browser/base/content/test/siteIdentity/file_bug902156_3.html
new file mode 100644
index 0000000000..7a26f4b0f0
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug902156_3.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 3 for Bug 902156 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=902156
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 3 for Bug 902156</title>
+</head>
+<body>
+  <div id="mctestdiv">Mixed Content Blocker enabled</div>
+  <script src="http://test1.example.com/browser/browser/base/content/test/siteIdentity/file_bug902156.js" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug906190.js b/browser/base/content/test/siteIdentity/file_bug906190.js
new file mode 100644
index 0000000000..01ef4073fb
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug906190.js
@@ -0,0 +1,6 @@
+/*
+ * Once the mixed content blocker is disabled for the page, this scripts loads
+ * and updates the text inside the div container.
+ */
+document.getElementById("mctestdiv").innerHTML =
+  "Mixed Content Blocker disabled";
diff --git a/browser/base/content/test/siteIdentity/file_bug906190.sjs b/browser/base/content/test/siteIdentity/file_bug906190.sjs
new file mode 100644
index 0000000000..088153d671
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug906190.sjs
@@ -0,0 +1,18 @@
+function handleRequest(request, response) {
+  var page = "<!DOCTYPE html><html><body>bug 906190</body></html>";
+  var path =
+    "https://test1.example.com/browser/browser/base/content/test/siteIdentity/";
+  var url;
+
+  if (request.queryString.includes("bad-redirection=1")) {
+    url = path + "this_page_does_not_exist.html";
+  } else {
+    url = path + "file_bug906190_redirected.html";
+  }
+
+  response.setHeader("Cache-Control", "no-cache", false);
+  response.setHeader("Content-Type", "text/html", false);
+  response.setStatusLine(request.httpVersion, "302", "Found");
+  response.setHeader("Location", url, false);
+  response.write(page);
+}
diff --git a/browser/base/content/test/siteIdentity/file_bug906190_1.html b/browser/base/content/test/siteIdentity/file_bug906190_1.html
new file mode 100644
index 0000000000..031c229f0d
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug906190_1.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 1 for Bug 906190 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=906190
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 1 for Bug 906190</title>
+</head>
+<body>
+  <div id="mctestdiv">Mixed Content Blocker enabled</div>
+  <script src="http://test1.example.com/browser/browser/base/content/test/siteIdentity/file_bug906190.js" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug906190_2.html b/browser/base/content/test/siteIdentity/file_bug906190_2.html
new file mode 100644
index 0000000000..2a7546dca4
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug906190_2.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 2 for Bug 906190 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=906190
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 2 for Bug 906190</title>
+</head>
+<body>
+  <div id="mctestdiv">Mixed Content Blocker enabled</div>
+  <script src="http://test2.example.com/browser/browser/base/content/test/siteIdentity/file_bug906190.js" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug906190_3_4.html b/browser/base/content/test/siteIdentity/file_bug906190_3_4.html
new file mode 100644
index 0000000000..e78e271f85
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug906190_3_4.html
@@ -0,0 +1,14 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 3 and 4 for Bug 906190 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=906190
+-->
+<head>
+  <meta charset="utf-8">
+  <meta http-equiv="refresh" content="0; url=https://test1.example.com/browser/browser/base/content/test/siteIdentity/file_bug906190_redirected.html">
+  <title>Test 3 and 4 for Bug 906190</title>
+</head>
+<body>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_bug906190_redirected.html b/browser/base/content/test/siteIdentity/file_bug906190_redirected.html
new file mode 100644
index 0000000000..d0bc4a39f5
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_bug906190_redirected.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Redirected Page of Test 3 to 6 for Bug 906190 - See file browser_bug902156.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=906190
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Redirected Page for Bug 906190</title>
+</head>
+<body>
+  <div id="mctestdiv">Mixed Content Blocker enabled</div>
+  <script src="http://test1.example.com/browser/browser/base/content/test/siteIdentity/file_bug906190.js" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.html b/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.html
new file mode 100644
index 0000000000..b5463d8d5b
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.html
@@ -0,0 +1,11 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Bug 1122236 - CSP: Implement block-all-mixed-content</title>
+  <meta http-equiv="Content-Security-Policy" content="block-all-mixed-content">
+</head>
+<body>
+  <script src="http://example.com/browser/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.js"></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.js b/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.js
new file mode 100644
index 0000000000..dc6d6a64e4
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_csp_block_all_mixedcontent.js
@@ -0,0 +1,3 @@
+// empty script file just used for testing Bug 1122236.
+// Making sure the UI is not degraded when blocking
+// mixed content using the CSP directive: block-all-mixed-content.
diff --git a/browser/base/content/test/siteIdentity/file_mixedContentFramesOnHttp.html b/browser/base/content/test/siteIdentity/file_mixedContentFramesOnHttp.html
new file mode 100644
index 0000000000..3ed5b82641
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_mixedContentFramesOnHttp.html
@@ -0,0 +1,14 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test for https://bugzilla.mozilla.org/show_bug.cgi?id=1182551
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1182551</title>
+</head>
+<body>
+  <p>Test for Bug 1182551.  This is an HTTP top level page.  We include an HTTPS iframe that loads mixed passive content.</p>
+  <iframe src="https://example.org/browser/browser/base/content/test/siteIdentity/file_mixedPassiveContent.html"></iframe>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload.html b/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload.html
new file mode 100644
index 0000000000..ae134f8cb0
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload.html
@@ -0,0 +1,18 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test for https://bugzilla.mozilla.org/show_bug.cgi?id=947079
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 947079</title>
+</head>
+<body>
+  <p>Test for Bug 947079</p>
+  <script>
+    window.addEventListener("unload", function() {
+        new Image().src = "http://mochi.test:8888/tests/image/test/mochitest/blue.png";
+    });
+  </script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload_test1.html b/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload_test1.html
new file mode 100644
index 0000000000..1d027b0362
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload_test1.html
@@ -0,0 +1,14 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 1 for https://bugzilla.mozilla.org/show_bug.cgi?id=947079
+Page with no insecure subresources
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 1 for Bug 947079</title>
+</head>
+<body>
+  <p>There are no insecure resource loads on this page</p>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload_test2.html b/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload_test2.html
new file mode 100644
index 0000000000..4813337cc8
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_mixedContentFromOnunload_test2.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test 2 for https://bugzilla.mozilla.org/show_bug.cgi?id=947079
+Page with an insecure image load
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 2 for Bug 947079</title>
+</head>
+<body>
+  <p>Page with http image load</p>
+  <img src="http://test2.example.com/tests/image/test/mochitest/blue.png">
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_mixedPassiveContent.html b/browser/base/content/test/siteIdentity/file_mixedPassiveContent.html
new file mode 100644
index 0000000000..a60ac94e8b
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_mixedPassiveContent.html
@@ -0,0 +1,13 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+Test for https://bugzilla.mozilla.org/show_bug.cgi?id=1182551
+-->
+<head>
+  <meta charset="utf-8">
+  <title>HTTPS page with HTTP image</title>
+</head>
+<body>
+  <img src="http://mochi.test:8888/tests/image/test/mochitest/blue.png">
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/file_pdf.pdf b/browser/base/content/test/siteIdentity/file_pdf.pdf
new file mode 100644
index 0000000000..593558f9a4
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_pdf.pdf
@@ -0,0 +1,12 @@
+%PDF-1.0

+1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj 2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj 3 0 obj<</Type/Page/MediaBox[0 0 3 3]>>endobj

+xref

+0 4

+0000000000 65535 f

+0000000010 00000 n

+0000000053 00000 n

+0000000102 00000 n

+trailer<</Size 4/Root 1 0 R>>

+startxref

+149

+%EOF
\ No newline at end of file
diff --git a/browser/base/content/test/siteIdentity/file_pdf_blob.html b/browser/base/content/test/siteIdentity/file_pdf_blob.html
new file mode 100644
index 0000000000..ff6ed659a2
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/file_pdf_blob.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset='utf-8'>
+</head>
+<body>
+  <script>
+    let blob = new Blob(["x"], { type: "application/pdf" });
+    let blobURL = URL.createObjectURL(blob);
+
+    let link = document.createElement("a");
+    link.innerText = "PDF blob";
+    link.target = "_blank";
+    link.href = blobURL;
+    document.body.appendChild(link);
+  </script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/head.js b/browser/base/content/test/siteIdentity/head.js
new file mode 100644
index 0000000000..d2a588a815
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/head.js
@@ -0,0 +1,435 @@
+function openIdentityPopup() {
+  gIdentityHandler._initializePopup();
+  let mainView = document.getElementById("identity-popup-mainView");
+  let viewShown = BrowserTestUtils.waitForEvent(mainView, "ViewShown");
+  gIdentityHandler._identityIconBox.click();
+  return viewShown;
+}
+
+function openPermissionPopup() {
+  gPermissionPanel._initializePopup();
+  let mainView = document.getElementById("permission-popup-mainView");
+  let viewShown = BrowserTestUtils.waitForEvent(mainView, "ViewShown");
+  gPermissionPanel.openPopup();
+  return viewShown;
+}
+
+function getIdentityMode(aWindow = window) {
+  return aWindow.document.getElementById("identity-box").className;
+}
+
+/**
+ * Waits for a load (or custom) event to finish in a given tab. If provided
+ * load an uri into the tab.
+ *
+ * @param tab
+ *        The tab to load into.
+ * @param [optional] url
+ *        The url to load, or the current url.
+ * @return {Promise} resolved when the event is handled.
+ * @resolves to the received event
+ * @rejects if a valid load event is not received within a meaningful interval
+ */
+function promiseTabLoadEvent(tab, url) {
+  info("Wait tab event: load");
+
+  function handle(loadedUrl) {
+    if (loadedUrl === "about:blank" || (url && loadedUrl !== url)) {
+      info(`Skipping spurious load event for ${loadedUrl}`);
+      return false;
+    }
+
+    info("Tab event received: load");
+    return true;
+  }
+
+  let loaded = BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, handle);
+
+  if (url) {
+    BrowserTestUtils.loadURIString(tab.linkedBrowser, url);
+  }
+
+  return loaded;
+}
+
+// Compares the security state of the page with what is expected
+function isSecurityState(browser, expectedState) {
+  let ui = browser.securityUI;
+  if (!ui) {
+    ok(false, "No security UI to get the security state");
+    return;
+  }
+
+  const wpl = Ci.nsIWebProgressListener;
+
+  // determine the security state
+  let isSecure = ui.state & wpl.STATE_IS_SECURE;
+  let isBroken = ui.state & wpl.STATE_IS_BROKEN;
+  let isInsecure = ui.state & wpl.STATE_IS_INSECURE;
+
+  let actualState;
+  if (isSecure && !(isBroken || isInsecure)) {
+    actualState = "secure";
+  } else if (isBroken && !(isSecure || isInsecure)) {
+    actualState = "broken";
+  } else if (isInsecure && !(isSecure || isBroken)) {
+    actualState = "insecure";
+  } else {
+    actualState = "unknown";
+  }
+
+  is(
+    expectedState,
+    actualState,
+    "Expected state " +
+      expectedState +
+      " and the actual state is " +
+      actualState +
+      "."
+  );
+}
+
+/**
+ * Test the state of the identity box and control center to make
+ * sure they are correctly showing the expected mixed content states.
+ *
+ * @note The checks are done synchronously, but new code should wait on the
+ *       returned Promise object to ensure the identity panel has closed.
+ *       Bug 1221114 is filed to fix the existing code.
+ *
+ * @param tabbrowser
+ * @param Object states
+ *        MUST include the following properties:
+ *        {
+ *           activeLoaded: true|false,
+ *           activeBlocked: true|false,
+ *           passiveLoaded: true|false,
+ *        }
+ *
+ * @return {Promise}
+ * @resolves When the operation has finished and the identity panel has closed.
+ */
+async function assertMixedContentBlockingState(tabbrowser, states = {}) {
+  if (
+    !tabbrowser ||
+    !("activeLoaded" in states) ||
+    !("activeBlocked" in states) ||
+    !("passiveLoaded" in states)
+  ) {
+    throw new Error(
+      "assertMixedContentBlockingState requires a browser and a states object"
+    );
+  }
+
+  let { passiveLoaded, activeLoaded, activeBlocked } = states;
+  let { gIdentityHandler } = tabbrowser.ownerGlobal;
+  let doc = tabbrowser.ownerDocument;
+  let identityBox = gIdentityHandler._identityBox;
+  let classList = identityBox.classList;
+  let identityIcon = doc.getElementById("identity-icon");
+  let identityIconImage = tabbrowser.ownerGlobal
+    .getComputedStyle(identityIcon)
+    .getPropertyValue("list-style-image");
+
+  let stateSecure =
+    gIdentityHandler._state & Ci.nsIWebProgressListener.STATE_IS_SECURE;
+  let stateBroken =
+    gIdentityHandler._state & Ci.nsIWebProgressListener.STATE_IS_BROKEN;
+  let stateInsecure =
+    gIdentityHandler._state & Ci.nsIWebProgressListener.STATE_IS_INSECURE;
+  let stateActiveBlocked =
+    gIdentityHandler._state &
+    Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_ACTIVE_CONTENT;
+  let stateActiveLoaded =
+    gIdentityHandler._state &
+    Ci.nsIWebProgressListener.STATE_LOADED_MIXED_ACTIVE_CONTENT;
+  let statePassiveLoaded =
+    gIdentityHandler._state &
+    Ci.nsIWebProgressListener.STATE_LOADED_MIXED_DISPLAY_CONTENT;
+
+  is(
+    activeBlocked,
+    !!stateActiveBlocked,
+    "Expected state for activeBlocked matches UI state"
+  );
+  is(
+    activeLoaded,
+    !!stateActiveLoaded,
+    "Expected state for activeLoaded matches UI state"
+  );
+  is(
+    passiveLoaded,
+    !!statePassiveLoaded,
+    "Expected state for passiveLoaded matches UI state"
+  );
+
+  if (stateInsecure) {
+    const insecureConnectionIcon = Services.prefs.getBoolPref(
+      "security.insecure_connection_icon.enabled"
+    );
+    if (!insecureConnectionIcon) {
+      // HTTP request, there should be no MCB classes for the identity box and the non secure icon
+      // should always be visible regardless of MCB state.
+      ok(classList.contains("unknownIdentity"), "unknownIdentity on HTTP page");
+      ok(
+        BrowserTestUtils.is_visible(identityIcon),
+        "information icon should be still visible"
+      );
+    } else {
+      // HTTP request, there should be a broken padlock shown always.
+      ok(classList.contains("notSecure"), "notSecure on HTTP page");
+      ok(
+        !BrowserTestUtils.is_hidden(identityIcon),
+        "information icon should be visible"
+      );
+    }
+
+    ok(!classList.contains("mixedActiveContent"), "No MCB icon on HTTP page");
+    ok(!classList.contains("mixedActiveBlocked"), "No MCB icon on HTTP page");
+    ok(!classList.contains("mixedDisplayContent"), "No MCB icon on HTTP page");
+    ok(
+      !classList.contains("mixedDisplayContentLoadedActiveBlocked"),
+      "No MCB icon on HTTP page"
+    );
+  } else {
+    // Make sure the identity box UI has the correct mixedcontent states and icons
+    is(
+      classList.contains("mixedActiveContent"),
+      activeLoaded,
+      "identityBox has expected class for activeLoaded"
+    );
+    is(
+      classList.contains("mixedActiveBlocked"),
+      activeBlocked && !passiveLoaded,
+      "identityBox has expected class for activeBlocked && !passiveLoaded"
+    );
+    is(
+      classList.contains("mixedDisplayContent"),
+      passiveLoaded && !(activeLoaded || activeBlocked),
+      "identityBox has expected class for passiveLoaded && !(activeLoaded || activeBlocked)"
+    );
+    is(
+      classList.contains("mixedDisplayContentLoadedActiveBlocked"),
+      passiveLoaded && activeBlocked,
+      "identityBox has expected class for passiveLoaded && activeBlocked"
+    );
+
+    ok(
+      !BrowserTestUtils.is_hidden(identityIcon),
+      "information icon should be visible"
+    );
+    if (activeLoaded) {
+      is(
+        identityIconImage,
+        'url("chrome://global/skin/icons/security-broken.svg")',
+        "Using active loaded icon"
+      );
+    }
+    if (activeBlocked && !passiveLoaded) {
+      is(
+        identityIconImage,
+        'url("chrome://global/skin/icons/security.svg")',
+        "Using active blocked icon"
+      );
+    }
+    if (passiveLoaded && !(activeLoaded || activeBlocked)) {
+      is(
+        identityIconImage,
+        'url("chrome://global/skin/icons/security-warning.svg")',
+        "Using passive loaded icon"
+      );
+    }
+    if (passiveLoaded && activeBlocked) {
+      is(
+        identityIconImage,
+        'url("chrome://global/skin/icons/security-warning.svg")',
+        "Using active blocked and passive loaded icon"
+      );
+    }
+  }
+
+  // Make sure the identity popup has the correct mixedcontent states
+  let promisePanelOpen = BrowserTestUtils.waitForEvent(
+    tabbrowser.ownerGlobal,
+    "popupshown",
+    true,
+    event => event.target == gIdentityHandler._identityPopup
+  );
+  gIdentityHandler._identityIconBox.click();
+  await promisePanelOpen;
+  let popupAttr = doc
+    .getElementById("identity-popup")
+    .getAttribute("mixedcontent");
+  let bodyAttr = doc
+    .getElementById("identity-popup-securityView-extended-info")
+    .getAttribute("mixedcontent");
+
+  is(
+    popupAttr.includes("active-loaded"),
+    activeLoaded,
+    "identity-popup has expected attr for activeLoaded"
+  );
+  is(
+    bodyAttr.includes("active-loaded"),
+    activeLoaded,
+    "securityView-body has expected attr for activeLoaded"
+  );
+
+  is(
+    popupAttr.includes("active-blocked"),
+    activeBlocked,
+    "identity-popup has expected attr for activeBlocked"
+  );
+  is(
+    bodyAttr.includes("active-blocked"),
+    activeBlocked,
+    "securityView-body has expected attr for activeBlocked"
+  );
+
+  is(
+    popupAttr.includes("passive-loaded"),
+    passiveLoaded,
+    "identity-popup has expected attr for passiveLoaded"
+  );
+  is(
+    bodyAttr.includes("passive-loaded"),
+    passiveLoaded,
+    "securityView-body has expected attr for passiveLoaded"
+  );
+
+  // Make sure the correct icon is visible in the Control Center.
+  // This logic is controlled with CSS, so this helps prevent regressions there.
+  let securityViewBG = tabbrowser.ownerGlobal
+    .getComputedStyle(
+      document
+        .getElementById("identity-popup-securityView")
+        .getElementsByClassName("identity-popup-security-connection")[0]
+    )
+    .getPropertyValue("list-style-image");
+  let securityContentBG = tabbrowser.ownerGlobal
+    .getComputedStyle(
+      document
+        .getElementById("identity-popup-mainView")
+        .getElementsByClassName("identity-popup-security-connection")[0]
+    )
+    .getPropertyValue("list-style-image");
+
+  if (stateInsecure) {
+    is(
+      securityViewBG,
+      'url("chrome://global/skin/icons/security-broken.svg")',
+      "CC using 'not secure' icon"
+    );
+    is(
+      securityContentBG,
+      'url("chrome://global/skin/icons/security-broken.svg")',
+      "CC using 'not secure' icon"
+    );
+  }
+
+  if (stateSecure) {
+    is(
+      securityViewBG,
+      'url("chrome://global/skin/icons/security.svg")',
+      "CC using secure icon"
+    );
+    is(
+      securityContentBG,
+      'url("chrome://global/skin/icons/security.svg")',
+      "CC using secure icon"
+    );
+  }
+
+  if (stateBroken) {
+    if (activeLoaded) {
+      is(
+        securityViewBG,
+        'url("chrome://browser/skin/controlcenter/mcb-disabled.svg")',
+        "CC using active loaded icon"
+      );
+      is(
+        securityContentBG,
+        'url("chrome://browser/skin/controlcenter/mcb-disabled.svg")',
+        "CC using active loaded icon"
+      );
+    } else if (activeBlocked || passiveLoaded) {
+      is(
+        securityViewBG,
+        'url("chrome://global/skin/icons/security-warning.svg")',
+        "CC using degraded icon"
+      );
+      is(
+        securityContentBG,
+        'url("chrome://global/skin/icons/security-warning.svg")',
+        "CC using degraded icon"
+      );
+    } else {
+      // There is a case here with weak ciphers, but no bc tests are handling this yet.
+      is(
+        securityViewBG,
+        'url("chrome://global/skin/icons/security.svg")',
+        "CC using degraded icon"
+      );
+      is(
+        securityContentBG,
+        'url("chrome://global/skin/icons/security.svg")',
+        "CC using degraded icon"
+      );
+    }
+  }
+
+  if (activeLoaded || activeBlocked || passiveLoaded) {
+    let promiseViewShown = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "ViewShown"
+    );
+    doc.getElementById("identity-popup-security-button").click();
+    await promiseViewShown;
+    is(
+      Array.prototype.filter.call(
+        doc
+          .getElementById("identity-popup-securityView")
+          .querySelectorAll(".identity-popup-mcb-learn-more"),
+        element => !BrowserTestUtils.is_hidden(element)
+      ).length,
+      1,
+      "The 'Learn more' link should be visible once."
+    );
+  }
+
+  if (gIdentityHandler._identityPopup.state != "closed") {
+    let hideEvent = BrowserTestUtils.waitForEvent(
+      gIdentityHandler._identityPopup,
+      "popuphidden"
+    );
+    info("Hiding identity popup");
+    gIdentityHandler._identityPopup.hidePopup();
+    await hideEvent;
+  }
+}
+
+async function loadBadCertPage(url) {
+  let loaded = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
+  BrowserTestUtils.loadURIString(gBrowser.selectedBrowser, url);
+  await loaded;
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async function () {
+    content.document.getElementById("exceptionDialogButton").click();
+  });
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+}
+
+// nsITLSServerSocket needs a certificate with a corresponding private key
+// available. In mochitests, the certificate with the common name "Mochitest
+// client" has such a key.
+function getTestServerCertificate() {
+  const certDB = Cc["@mozilla.org/security/x509certdb;1"].getService(
+    Ci.nsIX509CertDB
+  );
+  for (const cert of certDB.getCerts()) {
+    if (cert.commonName == "Mochitest client") {
+      return cert;
+    }
+  }
+  return null;
+}
diff --git a/browser/base/content/test/siteIdentity/iframe_navigation.html b/browser/base/content/test/siteIdentity/iframe_navigation.html
new file mode 100644
index 0000000000..d4564569e7
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/iframe_navigation.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+<html>
+<head>
+<meta charset="UTF-8">
+</head>
+<body class="running">
+  <script>
+    window.addEventListener("message", doNavigation);
+
+    function doNavigation() {
+      let destination;
+      let destinationIdentifier = window.location.hash.substring(1);
+      switch (destinationIdentifier) {
+        case "blank":
+          destination = "about:blank";
+          break;
+        case "secure":
+          destination =
+            "https://example.com/browser/browser/base/content/test/siteIdentity/dummy_page.html";
+          break;
+        case "insecure":
+          destination =
+            // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+            "http://example.com/browser/browser/base/content/test/siteIdentity/dummy_page.html";
+          break;
+      }
+      setTimeout(() => {
+        let frame = document.getElementById("navigateMe");
+        frame.onload = done;
+        frame.onerror = done;
+        frame.src = destination;
+      }, 0);
+    }
+
+    function done() {
+      document.body.classList.toggle("running");
+    }
+  </script>
+  <iframe id="navigateMe" src="dummy_page.html">
+  </iframe>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/insecure_opener.html b/browser/base/content/test/siteIdentity/insecure_opener.html
new file mode 100644
index 0000000000..26ed014f63
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/insecure_opener.html
@@ -0,0 +1,9 @@
+<!DOCTYPE HTML>
+<html dir="ltr" xml:lang="en-US" lang="en-US">
+  <head>
+    <meta charset="utf8">
+  </head>
+  <body>
+    <a id="link" target="_blank" href="https://example.com/browser/toolkit/components/passwordmgr/test/browser/form_basic.html">Click me, I'm "secure".</a>
+  </body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/open-self-from-frame.html b/browser/base/content/test/siteIdentity/open-self-from-frame.html
new file mode 100644
index 0000000000..17d0cf56ef
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/open-self-from-frame.html
@@ -0,0 +1,6 @@
+<iframe src="about:blank"></iframe>
+<script>
+  document.querySelector("iframe").contentDocument.write(
+    `<button onclick="window.open().document.write('Hi')">click me!</button>`
+    );
+</script>
diff --git a/browser/base/content/test/siteIdentity/simple_mixed_passive.html b/browser/base/content/test/siteIdentity/simple_mixed_passive.html
new file mode 100644
index 0000000000..2e4cda790a
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/simple_mixed_passive.html
@@ -0,0 +1 @@
+<img src="http://example.com/browser/browser/base/content/test/siteIdentity/moz.png">
diff --git a/browser/base/content/test/siteIdentity/test-mixedcontent-securityerrors.html b/browser/base/content/test/siteIdentity/test-mixedcontent-securityerrors.html
new file mode 100644
index 0000000000..cb8cfdaaf5
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test-mixedcontent-securityerrors.html
@@ -0,0 +1,21 @@
+<!--
+  Bug 875456 - Log mixed content messages from the Mixed Content Blocker to the
+  Security Pane in the Web Console
+-->
+
+<!DOCTYPE HTML>
+<html dir="ltr" xml:lang="en-US" lang="en-US">
+  <head>
+    <meta charset="utf8">
+    <title>Mixed Content test - http on https</title>
+    <script src="testscript.js"></script>
+    <!--
+      Any copyright is dedicated to the Public Domain.
+      http://creativecommons.org/publicdomain/zero/1.0/
+    -->
+  </head>
+  <body>
+    <iframe src="http://example.com"></iframe>
+    <img src="http://example.com/tests/image/test/mochitest/blue.png"></img>
+  </body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_mcb_double_redirect_image.html b/browser/base/content/test/siteIdentity/test_mcb_double_redirect_image.html
new file mode 100644
index 0000000000..adadf01944
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_mcb_double_redirect_image.html
@@ -0,0 +1,23 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 7-9 for Bug 1082837 - See file browser_mcb_redirect.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=1082837
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Bug 1082837</title>
+  <script>
+    function image_loaded() {
+      document.getElementById("mctestdiv").innerHTML = "image loaded";
+    }
+    function image_blocked() {
+      document.getElementById("mctestdiv").innerHTML = "image blocked";
+    }
+  </script>
+</head>
+<body>
+  <div id="mctestdiv"></div>
+  <img src="https://example.com/browser/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs?image_redirect_http_sjs" onload="image_loaded()" onerror="image_blocked()" ></image>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_mcb_redirect.html b/browser/base/content/test/siteIdentity/test_mcb_redirect.html
new file mode 100644
index 0000000000..fc7ccc2764
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_mcb_redirect.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 1 for Bug 418354 - See file browser_mcb_redirect.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=418354
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Bug 418354</title>
+</head>
+<body>
+  <div id="mctestdiv">script blocked</div>
+  <script src="https://example.com/browser/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs?script" ></script>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_mcb_redirect.js b/browser/base/content/test/siteIdentity/test_mcb_redirect.js
new file mode 100644
index 0000000000..48538c9409
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_mcb_redirect.js
@@ -0,0 +1,5 @@
+/*
+ * Once the mixed content blocker is disabled for the page, this scripts loads
+ * and updates the text inside the div container.
+ */
+document.getElementById("mctestdiv").innerHTML = "script executed";
diff --git a/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs b/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs
new file mode 100644
index 0000000000..53b8cf2b08
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs
@@ -0,0 +1,29 @@
+function handleRequest(request, response) {
+  var page =
+    "<!DOCTYPE html><html><body>bug 418354 and bug 1082837</body></html>";
+
+  let redirect;
+  if (request.queryString === "script") {
+    redirect =
+      // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+      "http://example.com/browser/browser/base/content/test/siteIdentity/test_mcb_redirect.js";
+    response.setHeader("Cache-Control", "no-cache", false);
+  } else if (request.queryString === "image_http") {
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    redirect = "http://example.com/tests/image/test/mochitest/blue.png";
+    response.setHeader("Cache-Control", "max-age=3600", false);
+  } else if (request.queryString === "image_redirect_http_sjs") {
+    redirect =
+      // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+      "http://example.com/browser/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs?image_redirect_https";
+    response.setHeader("Cache-Control", "max-age=3600", false);
+  } else if (request.queryString === "image_redirect_https") {
+    redirect = "https://example.com/tests/image/test/mochitest/blue.png";
+    response.setHeader("Cache-Control", "max-age=3600", false);
+  }
+
+  response.setHeader("Content-Type", "text/html", false);
+  response.setStatusLine(request.httpVersion, "302", "Found");
+  response.setHeader("Location", redirect, false);
+  response.write(page);
+}
diff --git a/browser/base/content/test/siteIdentity/test_mcb_redirect_image.html b/browser/base/content/test/siteIdentity/test_mcb_redirect_image.html
new file mode 100644
index 0000000000..42da0d7c13
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_mcb_redirect_image.html
@@ -0,0 +1,23 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 3-6 for Bug 1082837 - See file browser_mcb_redirect.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=1082837
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Bug 1082837</title>
+  <script>
+    function image_loaded() {
+      document.getElementById("mctestdiv").innerHTML = "image loaded";
+    }
+    function image_blocked() {
+      document.getElementById("mctestdiv").innerHTML = "image blocked";
+    }
+  </script>
+</head>
+<body>
+  <div id="mctestdiv"></div>
+  <img src="https://example.com/browser/browser/base/content/test/siteIdentity/test_mcb_redirect.sjs?image_http" onload="image_loaded()" onerror="image_blocked()" ></image>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_for_loopback.html b/browser/base/content/test/siteIdentity/test_no_mcb_for_loopback.html
new file mode 100644
index 0000000000..34193d370b
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_for_loopback.html
@@ -0,0 +1,56 @@
+<!-- See browser_no_mcb_for_localhost.js -->
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf8">
+    <title>Bug 903966, Bug 1402530</title>
+  </head>
+
+  <style>
+    @font-face {
+      font-family: "Font-IPv4";
+      src: url("http://127.0.0.1:8/test.ttf");
+    }
+
+    @font-face {
+      font-family: "Font-IPv6";
+      src: url("http://[::1]:8/test.ttf");
+    }
+
+    #ip-v4 {
+      font-family: "Font-IPv4"
+    }
+
+    #ip-v6 {
+      font-family: "Font-IPv6"
+    }
+  </style>
+
+  <body>
+    <div id="ip-v4">test</div>
+    <div id="ip-v6">test</div>
+
+    <img src="http://127.0.0.1:8/test.png">
+    <img src="http://[::1]:8/test.png">
+    <img src="http://localhost:8/test.png">
+
+    <iframe src="http://127.0.0.1:8/test.html"></iframe>
+    <iframe src="http://[::1]:8/test.html"></iframe>
+    <iframe src="http://localhost:8/test.html"></iframe>
+  </body>
+
+  <script src="http://127.0.0.1:8/test.js"></script>
+  <script src="http://[::1]:8/test.js"></script>
+  <script src="http://localhost:8/test.js"></script>
+
+  <link href="http://127.0.0.1:8/test.css" rel="stylesheet"></link>
+  <link href="http://[::1]:8/test.css" rel="stylesheet"></link>
+  <link href="http://localhost:8/test.css" rel="stylesheet"></link>
+
+  <script>
+    fetch("http://127.0.0.1:8");
+    fetch("http://localhost:8");
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    fetch("http://[::1]:8");
+  </script>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_for_onions.html b/browser/base/content/test/siteIdentity/test_no_mcb_for_onions.html
new file mode 100644
index 0000000000..c73c3681a3
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_for_onions.html
@@ -0,0 +1,29 @@
+<!-- See browser_no_mcb_for_onions.js -->
+<!DOCTYPE HTML>
+<html>
+  <head>
+    <meta charset="utf8">
+    <title>Bug 1382359</title>
+  </head>
+
+  <style>
+    @font-face {
+      src: url("http://123456789abcdef.onion:8/test.ttf");
+    }
+  </style>
+
+  <body>
+    <img src="http://123456789abcdef.onion:8/test.png">
+
+    <iframe src="http://123456789abcdef.onion:8/test.html"></iframe>
+  </body>
+
+  <script src="http://123456789abcdef.onion:8/test.js"></script>
+
+  <link href="http://123456789abcdef.onion:8/test.css" rel="stylesheet"></link>
+
+  <script>
+    // eslint-disable-next-line @microsoft/sdl/no-insecure-url
+    fetch("http://123456789abcdef.onion:8");
+  </script>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.css b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.css
new file mode 100644
index 0000000000..0587ef7939
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.css
@@ -0,0 +1,11 @@
+@font-face {
+  font-family: testFont;
+  src: url(http://example.com/browser/devtools/client/fontinspector/test/browser_font.woff);
+}
+/* stylelint-disable font-family-no-missing-generic-family-keyword */
+body {
+  font-family: Arial;
+}
+div {
+  font-family: testFont;
+}
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.html b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.html
new file mode 100644
index 0000000000..7b39be064c
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 2 for Bug 909920 - See file browser_no_mcb_on_http_site.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=909920
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 2 for Bug 909920</title>
+  <link rel="stylesheet" type="text/css" href="https://example.com/browser/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.css" />
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+
+<script type="text/javascript">
+  async function checkLoadStates() {
+   let state = await SpecialPowers.getSecurityState(window);
+
+   var loadedMixedActive =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_LOADED_MIXED_ACTIVE_CONTENT);
+   is(loadedMixedActive, false, "OK: Should not load mixed active content!");
+
+   var blockedMixedActive =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_ACTIVE_CONTENT);
+   is(blockedMixedActive, false, "OK: Should not block mixed active content!");
+
+   var loadedMixedDisplay =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_LOADED_MIXED_DISPLAY_CONTENT);
+   is(loadedMixedDisplay, false, "OK: Should not load mixed display content!");
+
+   var blockedMixedDisplay =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_DISPLAY_CONTENT);
+   is(blockedMixedDisplay, false, "OK: Should not block mixed display content!");
+
+   var newValue = "Verifying MCB does not trigger warning/error for an http page with https css that includes http font";
+   // eslint-disable-next-line no-unsanitized/property
+   document.getElementById("testDiv").innerHTML = newValue;
+  }
+</script>
+</head>
+<body onload="checkLoadStates()">
+  <div class="testDiv" id="testDiv">
+    Testing MCB does not trigger warning/error for an http page with https css that includes http font
+  </div>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.css b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.css
new file mode 100644
index 0000000000..3ac6c87a6b
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.css
@@ -0,0 +1 @@
+@import url(http://example.com/browser/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font.css);
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.html b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.html
new file mode 100644
index 0000000000..3da31592dd
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 3 for Bug 909920 - See file browser_no_mcb_on_http_site.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=909920
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 3 for Bug 909920</title>
+  <link rel="stylesheet" type="text/css" href="https://example.com/browser/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_font2.css" />
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+
+<script type="text/javascript">
+  async function checkLoadStates() {
+   let state = await SpecialPowers.getSecurityState(window);
+
+   var loadedMixedActive =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_LOADED_MIXED_ACTIVE_CONTENT);
+   is(loadedMixedActive, false, "OK: Should not load mixed active content!");
+
+   var blockedMixedActive =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_ACTIVE_CONTENT);
+   is(blockedMixedActive, false, "OK: Should not block mixed active content!");
+
+   var loadedMixedDisplay =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_LOADED_MIXED_DISPLAY_CONTENT);
+   is(loadedMixedDisplay, false, "OK: Should not load mixed display content!");
+
+   var blockedMixedDisplay =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_DISPLAY_CONTENT);
+   is(blockedMixedDisplay, false, "OK: Should not block mixed display content!");
+
+   var newValue = "Verifying MCB does not trigger warning/error for an http page ";
+    newValue += "with https css that imports another http css which includes http font";
+   // eslint-disable-next-line no-unsanitized/property
+   document.getElementById("testDiv").innerHTML = newValue;
+  }
+</script>
+</head>
+<body onload="checkLoadStates()">
+  <div class="testDiv" id="testDiv">
+    Testing MCB does not trigger warning/error for an http page with https css that imports another http css which includes http font
+  </div>
+</body>
+</html>
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.css b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.css
new file mode 100644
index 0000000000..d045e21ba0
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.css
@@ -0,0 +1,3 @@
+#testDiv {
+  background: url(http://example.com/tests/image/test/mochitest/blue.png)
+}
diff --git a/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.html b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.html
new file mode 100644
index 0000000000..10aa281959
--- /dev/null
+++ b/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+  Test 1 for Bug 909920 - See file browser_no_mcb_on_http_site.js for description.
+  https://bugzilla.mozilla.org/show_bug.cgi?id=909920
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test 1 for Bug 909920</title>
+  <link rel="stylesheet" type="text/css" href="https://example.com/browser/browser/base/content/test/siteIdentity/test_no_mcb_on_http_site_img.css" />
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+
+<script type="text/javascript">
+  async function checkLoadStates() {
+   let state = await SpecialPowers.getSecurityState(window);
+
+   var loadedMixedActive =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_LOADED_MIXED_ACTIVE_CONTENT);
+   is(loadedMixedActive, false, "OK: Should not load mixed active content!");
+
+   var blockedMixedActive =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_ACTIVE_CONTENT);
+   is(blockedMixedActive, false, "OK: Should not block mixed active content!");
+
+   var loadedMixedDisplay =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_LOADED_MIXED_DISPLAY_CONTENT);
+   is(loadedMixedDisplay, false, "OK: Should not load mixed display content!");
+
+   var blockedMixedDisplay =
+     !!(state & SpecialPowers.Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_DISPLAY_CONTENT);
+   is(blockedMixedDisplay, false, "OK: Should not block mixed display content!");
+
+   var newValue = "Verifying MCB does not trigger warning/error for an http page with https css that includes http image";
+   // eslint-disable-next-line no-unsanitized/property
+   document.getElementById("testDiv").innerHTML = newValue;
+  }
+</script>
+</head>
+<body onload="checkLoadStates()">
+  <div class="testDiv" id="testDiv">
+    Testing MCB does not trigger warning/error for an http page with https css that includes http image
+  </div>
+</body>
+</html>