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diff --git a/accessible/tests/browser/e10s/browser_caching_relations_002.js b/accessible/tests/browser/e10s/browser_caching_relations_002.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";
+requestLongerTimeout(2);
+
+/**
+ * Test MEMBER_OF relation caching on HTML radio buttons
+ */
+addAccessibleTask(
+  `
+  <input type="radio" id="r1">I have no name<br>
+  <input type="radio" id="r2">I also have no name<br>
+  <input type="radio" id="r3" name="n">I have a name<br>
+  <input type="radio" id="r4" name="a">I have a different name<br>
+  <fieldset role="radiogroup">
+    <input type="radio" id="r5" name="n">I have an already used name
+     and am in a different part of the tree
+    <input type="radio" id="r6" name="r">I have a different name but am
+     in the same group
+  </fieldset>`,
+  async function(browser, accDoc) {
+    const r1 = findAccessibleChildByID(accDoc, "r1");
+    const r2 = findAccessibleChildByID(accDoc, "r2");
+    const r3 = findAccessibleChildByID(accDoc, "r3");
+    const r4 = findAccessibleChildByID(accDoc, "r4");
+    const r5 = findAccessibleChildByID(accDoc, "r5");
+    const r6 = findAccessibleChildByID(accDoc, "r6");
+
+    await testCachedRelation(r1, RELATION_MEMBER_OF, null);
+    await testCachedRelation(r2, RELATION_MEMBER_OF, null);
+    await testCachedRelation(r3, RELATION_MEMBER_OF, [r3, r5]);
+    await testCachedRelation(r4, RELATION_MEMBER_OF, r4);
+    await testCachedRelation(r5, RELATION_MEMBER_OF, [r3, r5]);
+    await testCachedRelation(r6, RELATION_MEMBER_OF, r6);
+
+    await invokeContentTask(browser, [], () => {
+      content.document.getElementById("r5").name = "a";
+    });
+
+    await testCachedRelation(r3, RELATION_MEMBER_OF, r3);
+    await testCachedRelation(r4, RELATION_MEMBER_OF, [r5, r4]);
+    await testCachedRelation(r5, RELATION_MEMBER_OF, [r5, r4]);
+  },
+  { chrome: true, iframe: true, remoteIframe: true }
+);
+
+/*
+ * Test MEMBER_OF relation caching on aria radio buttons
+ */
+addAccessibleTask(
+  `
+  <div role="radio" id="r1">I have no radio group</div><br>
+  <fieldset role="radiogroup" id="fs">
+    <div role="radio" id="r2">hello</div><br>
+    <div role="radio" id="r3">world</div><br>
+  </fieldset>`,
+  async function(browser, accDoc) {
+    const r1 = findAccessibleChildByID(accDoc, "r1");
+    const r2 = findAccessibleChildByID(accDoc, "r2");
+    let r3 = findAccessibleChildByID(accDoc, "r3");
+
+    await testCachedRelation(r1, RELATION_MEMBER_OF, null);
+    await testCachedRelation(r2, RELATION_MEMBER_OF, [r2, r3]);
+    await testCachedRelation(r3, RELATION_MEMBER_OF, [r2, r3]);
+    const r = waitForEvent(EVENT_INNER_REORDER, "fs");
+    await invokeContentTask(browser, [], () => {
+      let innerRadio = content.document.getElementById("r3");
+      content.document.body.appendChild(innerRadio);
+    });
+    await r;
+
+    r3 = findAccessibleChildByID(accDoc, "r3");
+    await testCachedRelation(r1, RELATION_MEMBER_OF, null);
+    await testCachedRelation(r2, RELATION_MEMBER_OF, r2);
+    await testCachedRelation(r3, RELATION_MEMBER_OF, null);
+  },
+  {
+    chrome: true,
+    iframe: true,
+    remoteIframe: true,
+  }
+);
+
+/*
+ * Test mutation of LABEL relations via accessible shutdown.
+ */
+addAccessibleTask(
+  `
+  <div id="d"></div>
+  <label id="l">
+    <select id="s">
+  `,
+  async function(browser, accDoc) {
+    const label = findAccessibleChildByID(accDoc, "l");
+    const select = findAccessibleChildByID(accDoc, "s");
+    const div = findAccessibleChildByID(accDoc, "d");
+
+    await testCachedRelation(label, RELATION_LABEL_FOR, select);
+    await testCachedRelation(select, RELATION_LABELLED_BY, label);
+    await testCachedRelation(div, RELATION_LABELLED_BY, null);
+
+    const r = waitForEvent(EVENT_REORDER, "l");
+    await invokeContentTask(browser, [], () => {
+      content.document.getElementById("s").remove();
+    });
+    await r;
+    await invokeContentTask(browser, [], () => {
+      const l = content.document.getElementById("l");
+      l.htmlFor = "d";
+    });
+    await testCachedRelation(label, RELATION_LABEL_FOR, div);
+    await testCachedRelation(div, RELATION_LABELLED_BY, label);
+  },
+  {
+    chrome: false,
+    iframe: isCacheEnabled,
+    remoteIframe: isCacheEnabled,
+    topLevel: isCacheEnabled,
+  }
+);
+
+/*
+ * Test mutation of LABEL relations via DOM ID reuse.
+ */
+addAccessibleTask(
+  `
+  <div id="label">before</div><input id="input" aria-labelledby="label">
+  `,
+  async function(browser, accDoc) {
+    let label = findAccessibleChildByID(accDoc, "label");
+    const input = findAccessibleChildByID(accDoc, "input");
+
+    await testCachedRelation(label, RELATION_LABEL_FOR, input);
+    await testCachedRelation(input, RELATION_LABELLED_BY, label);
+
+    const r = waitForEvent(EVENT_REORDER, accDoc);
+    await invokeContentTask(browser, [], () => {
+      content.document.getElementById("label").remove();
+      let l = content.document.createElement("div");
+      l.id = "label";
+      l.textContent = "after";
+      content.document.body.insertBefore(
+        l,
+        content.document.getElementById("input")
+      );
+    });
+    await r;
+    label = findAccessibleChildByID(accDoc, "label");
+    await testCachedRelation(label, RELATION_LABEL_FOR, input);
+    await testCachedRelation(input, RELATION_LABELLED_BY, label);
+  },
+  {
+    chrome: true,
+    iframe: true,
+    remoteIframe: true,
+  }
+);
+
+/*
+ * Test LINKS_TO relation caching an anchor with multiple hashes
+ */
+addAccessibleTask(
+  `
+  <a id="link" href="#foo#bar">Origin</a><br>
+  <a id="anchor" name="foo#bar">Destination`,
+  async function(browser, accDoc) {
+    const link = findAccessibleChildByID(accDoc, "link");
+    const anchor = findAccessibleChildByID(accDoc, "anchor");
+
+    await testCachedRelation(link, RELATION_LINKS_TO, anchor);
+  },
+  {
+    chrome: true,
+    // IA2 doesn't have a LINKS_TO relation and Windows non-cached
+    // RemoteAccessible uses IA2, so we can't run these tests in this case.
+    topLevel: !isWinNoCache,
+    iframe: !isWinNoCache,
+    remoteIframe: !isWinNoCache,
+  }
+);
+
+/*
+ * Test mutation of LABEL relations via accessible shutdown.
+ */
+addAccessibleTask(
+  `
+  <div id="d"></div>
+  <label id="l">
+    <select id="s">
+  `,
+  async function(browser, accDoc) {
+    const label = findAccessibleChildByID(accDoc, "l");
+    const select = findAccessibleChildByID(accDoc, "s");
+    const div = findAccessibleChildByID(accDoc, "d");
+
+    await testCachedRelation(label, RELATION_LABEL_FOR, select);
+    await testCachedRelation(select, RELATION_LABELLED_BY, label);
+    await testCachedRelation(div, RELATION_LABELLED_BY, null);
+    await untilCacheOk(() => {
+      try {
+        // We should get an acc ID back from this, but we don't have a way of
+        // verifying its correctness -- it should be the ID of the select.
+        return label.cache.getStringProperty("for");
+      } catch (e) {
+        ok(false, "Exception thrown while trying to read from the cache");
+        return false;
+      }
+    }, "Label for relation exists");
+
+    const r = waitForEvent(EVENT_REORDER, "l");
+    await invokeContentTask(browser, [], () => {
+      content.document.getElementById("s").remove();
+    });
+    await r;
+    await untilCacheOk(() => {
+      try {
+        label.cache.getStringProperty("for");
+      } catch (e) {
+        // This property should no longer exist in the cache, so we should
+        // get an exception if we try to fetch it.
+        return true;
+      }
+      return false;
+    }, "Label for relation exists");
+
+    await invokeContentTask(browser, [], () => {
+      const l = content.document.getElementById("l");
+      l.htmlFor = "d";
+    });
+    await testCachedRelation(label, RELATION_LABEL_FOR, div);
+    await testCachedRelation(div, RELATION_LABELLED_BY, label);
+  },
+  {
+    /**
+     * This functionality is broken in our LocalAcccessible implementation,
+     * so we avoid running this test in chrome or when the cache is off.
+     */
+    chrome: false,
+    iframe: isCacheEnabled,
+    remoteIframe: isCacheEnabled,
+    topLevel: isCacheEnabled,
+  }
+);