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diff --git a/accessible/tests/browser/e10s/browser_treeupdate_move.js b/accessible/tests/browser/e10s/browser_treeupdate_move.js
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+/* 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/. */
+
+"use strict";
+
+/* import-globals-from ../../mochitest/role.js */
+/* import-globals-from ../../mochitest/states.js */
+loadScripts(
+  { name: "role.js", dir: MOCHITESTS_DIR },
+  { name: "states.js", dir: MOCHITESTS_DIR }
+);
+
+/**
+ * Test moving Accessibles:
+ * 1. A moved Accessible keeps the same Accessible.
+ * 2. If the moved Accessible is focused, it remains focused.
+ * 3. A child of the moved Accessible also keeps the same Accessible.
+ * 4. A child removed at the same time as the move gets shut down.
+ */
+addAccessibleTask(
+  `
+<div id="scrollable" role="presentation" style="height: 1px;">
+  <div contenteditable id="textbox" role="textbox">
+    <h1 id="heading">Heading</h1>
+    <p id="para">Para</p>
+  </div>
+  <iframe id="iframe" src="https://example.com/"></iframe>
+</div>
+  `,
+  async function (browser, docAcc) {
+    const textbox = findAccessibleChildByID(docAcc, "textbox");
+    const heading = findAccessibleChildByID(docAcc, "heading");
+    const para = findAccessibleChildByID(docAcc, "para");
+    const iframe = findAccessibleChildByID(docAcc, "iframe");
+    const iframeDoc = iframe.firstChild;
+    ok(iframeDoc, "iframe contains a document");
+
+    let focused = waitForEvent(EVENT_FOCUS, textbox);
+    textbox.takeFocus();
+    await focused;
+    testStates(textbox, STATE_FOCUSED, 0, 0, EXT_STATE_DEFUNCT);
+
+    let reordered = waitForEvent(EVENT_REORDER, docAcc);
+    await invokeContentTask(browser, [], () => {
+      // scrollable wasn't in the a11y tree, but this will force it to be created.
+      // textbox will be moved inside it.
+      content.document.getElementById("scrollable").style.overflow = "scroll";
+      content.document.getElementById("heading").remove();
+    });
+    await reordered;
+    // Despite the move, ensure textbox is still alive and is focused.
+    testStates(textbox, STATE_FOCUSED, 0, 0, EXT_STATE_DEFUNCT);
+    // Ensure para (a child of textbox) is also still alive.
+    ok(!isDefunct(para), "para is alive");
+    // heading was a child of textbox, but was removed when textbox
+    // was moved. Ensure it is dead.
+    ok(isDefunct(heading), "heading is dead");
+    // Ensure the iframe and its embedded document are alive.
+    ok(!isDefunct(iframe), "iframe is alive");
+    ok(!isDefunct(iframeDoc), "iframeDoc is alive");
+  },
+  { chrome: true, topLevel: true, iframe: true, remoteIframe: true }
+);
+
+/**
+ * Test that moving a subtree containing an iframe doesn't cause assertions or
+ * crashes. Note that aria-owns moves Accessibles even if it is set before load.
+ */
+addAccessibleTask(
+  `
+<div id="container">
+  <iframe id="iframe"></iframe>
+  <div aria-owns="iframe"></div>
+</div>
+  `,
+  async function (browser, docAcc) {
+    const container = findAccessibleChildByID(docAcc, "container");
+    testAccessibleTree(container, {
+      SECTION: [{ SECTION: [{ INTERNAL_FRAME: [{ DOCUMENT: [] }] }] }],
+    });
+  },
+  { topLevel: true }
+);