1 files changed, 56 insertions, 0 deletions
diff --git a/dom/security/test/https-only/browser_bug1874801.js b/dom/security/test/https-only/browser_bug1874801.js
new file mode 100644
index 0000000000..280a072736
--- /dev/null
+++ b/dom/security/test/https-only/browser_bug1874801.js
@@ -0,0 +1,56 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Specifically test https://bugzilla.mozilla.org/show_bug.cgi?id=1874801
+
+const TAB_URL =
+  "https://example.com/browser/dom/security/test/https-only/file_bug1874801.html";
+
+function assertImageLoaded(tab) {
+  return ContentTask.spawn(tab.linkedBrowser, {}, () => {
+    const img = content.document.getElementsByTagName("img")[0];
+
+    ok(!!img, "Image tag should exist");
+    ok(img.complete && img.naturalWidth > 0, "Image should have loaded ");
+  });
+}
+
+add_task(async function test_bug1874801() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["security.mixed_content.upgrade_display_content", false],
+      ["dom.security.https_first", true],
+      ["dom.security.https_only_mode", true],
+    ],
+  });
+
+  // Open Tab
+  const tabToClose = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    TAB_URL,
+    true
+  );
+
+  // Make sure the image was loaded via HTTPS
+  await assertImageLoaded(tabToClose);
+
+  // Close Tab
+  const tabClosePromise =
+    BrowserTestUtils.waitForSessionStoreUpdate(tabToClose);
+  BrowserTestUtils.removeTab(tabToClose);
+  await tabClosePromise;
+
+  // Restore Tab
+  const restoredTabPromise = BrowserTestUtils.waitForNewTab(
+    gBrowser,
+    TAB_URL,
+    true
+  );
+  undoCloseTab();
+  const restoredTab = await restoredTabPromise;
+
+  // Make sure the image was loaded via HTTPS
+  await assertImageLoaded(restoredTab);
+});