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diff --git a/accessible/tests/browser/e10s/browser_caching_relations.js b/accessible/tests/browser/e10s/browser_caching_relations.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);
+
+/**
+ * A test specification that has the following format:
+ * [
+ *   attr                 relevant aria attribute
+ *   hostRelation         corresponding host relation type
+ *   dependantRelation    corresponding dependant relation type
+ * ]
+ */
+const attrRelationsSpec = [
+  ["aria-labelledby", RELATION_LABELLED_BY, RELATION_LABEL_FOR],
+  ["aria-describedby", RELATION_DESCRIBED_BY, RELATION_DESCRIPTION_FOR],
+  ["aria-controls", RELATION_CONTROLLER_FOR, RELATION_CONTROLLED_BY],
+  ["aria-flowto", RELATION_FLOWS_TO, RELATION_FLOWS_FROM],
+  ["aria-details", RELATION_DETAILS, RELATION_DETAILS_FOR],
+  ["aria-errormessage", RELATION_ERRORMSG, RELATION_ERRORMSG_FOR],
+];
+
+/**
+ * Test caching of relations between accessible objects.
+ */
+addAccessibleTask(
+  `
+  <div id="dependant1">label</div>
+  <div id="dependant2">label2</div>
+  <div role="checkbox" id="host"></div>`,
+  async function (browser, accDoc) {
+    for (let spec of attrRelationsSpec) {
+      await testRelated(browser, accDoc, ...spec);
+    }
+  },
+  { iframe: true, remoteIframe: true }
+);
+
+/**
+ * Test caching of relations with respect to label objects and their "for" attr.
+ */
+addAccessibleTask(
+  `
+  <input type="checkbox" id="dependant1">
+  <input type="checkbox" id="dependant2">
+  <label id="host">label</label>`,
+  async function (browser, accDoc) {
+    await testRelated(
+      browser,
+      accDoc,
+      "for",
+      RELATION_LABEL_FOR,
+      RELATION_LABELLED_BY
+    );
+  },
+  { iframe: true, remoteIframe: true }
+);
+
+/**
+ * Test rel caching for element with existing relation attribute.
+ */
+addAccessibleTask(
+  `<div id="label">label</div><button id="button" aria-labelledby="label">`,
+  async function (browser, accDoc) {
+    const button = findAccessibleChildByID(accDoc, "button");
+    const label = findAccessibleChildByID(accDoc, "label");
+
+    await testCachedRelation(button, RELATION_LABELLED_BY, label);
+    await testCachedRelation(label, RELATION_LABEL_FOR, button);
+  },
+  { iframe: true, remoteIframe: true }
+);
+
+/**
+ * Test caching of relations with respect to output objects and their "for" attr.
+ */
+addAccessibleTask(
+  `
+  <form oninput="host.value=parseInt(dependant1.value)+parseInt(dependant2.value)">
+    <input type="number" id="dependant1" value="50"> +
+    <input type="number" id="dependant2" value="25"> =
+    <output name="host" id="host"></output>
+  </form>`,
+  async function (browser, accDoc) {
+    await testRelated(
+      browser,
+      accDoc,
+      "for",
+      RELATION_CONTROLLED_BY,
+      RELATION_CONTROLLER_FOR
+    );
+  },
+  { iframe: true, remoteIframe: true }
+);
+
+/**
+ * Test rel caching for <label> element with existing "for" attribute.
+ */
+addAccessibleTask(
+  `data:text/html,<label id="label" for="input">label</label><input id="input">`,
+  async function (browser, accDoc) {
+    const input = findAccessibleChildByID(accDoc, "input");
+    const label = findAccessibleChildByID(accDoc, "label");
+    await testCachedRelation(input, RELATION_LABELLED_BY, label);
+    await testCachedRelation(label, RELATION_LABEL_FOR, input);
+  },
+  { iframe: true, remoteIframe: true }
+);
+
+/*
+ * Test caching of relations with respect to label objects that are ancestors of
+ * their target.
+ */
+addAccessibleTask(
+  `
+  <label id="host">
+    <input type="checkbox" id="dependant1">
+  </label>`,
+  async function (browser, accDoc) {
+    const input = findAccessibleChildByID(accDoc, "dependant1");
+    const label = findAccessibleChildByID(accDoc, "host");
+
+    await testCachedRelation(input, RELATION_LABELLED_BY, label);
+    await testCachedRelation(label, RELATION_LABEL_FOR, input);
+  },
+  { iframe: true, remoteIframe: true }
+);
+
+/*
+ * Test EMBEDS on root accessible.
+ */
+addAccessibleTask(
+  `hello world`,
+  async function (browser, primaryDocAcc, secondaryDocAcc) {
+    // The root accessible should EMBED the top level
+    // content document. If this test runs in an iframe,
+    // the test harness will pass in doc accs for both the
+    // iframe (primaryDocAcc) and the top level remote
+    // browser (secondaryDocAcc). We should use the second
+    // one.
+    // If this is not in an iframe, we'll only get
+    // a single docAcc (primaryDocAcc) which refers to
+    // the top level content doc.
+    const topLevelDoc = secondaryDocAcc ? secondaryDocAcc : primaryDocAcc;
+    await testRelation(
+      getRootAccessible(document),
+      RELATION_EMBEDS,
+      topLevelDoc
+    );
+  },
+  { chrome: true, iframe: true, remoteIframe: true }
+);
+
+/**
+ * Test CONTAINING_TAB_PANE
+ */
+addAccessibleTask(
+  `<p id="p">hello world</p>`,
+  async function (browser, primaryDocAcc, secondaryDocAcc) {
+    // The CONTAINING_TAB_PANE of any acc should be the top level
+    // content document. If this test runs in an iframe,
+    // the test harness will pass in doc accs for both the
+    // iframe (primaryDocAcc) and the top level remote
+    // browser (secondaryDocAcc). We should use the second
+    // one.
+    // If this is not in an iframe, we'll only get
+    // a single docAcc (primaryDocAcc) which refers to
+    // the top level content doc.
+    const topLevelDoc = secondaryDocAcc ? secondaryDocAcc : primaryDocAcc;
+    await testCachedRelation(
+      findAccessibleChildByID(primaryDocAcc, "p"),
+      RELATION_CONTAINING_TAB_PANE,
+      topLevelDoc
+    );
+  },
+  {
+    chrome: true,
+    topLevel: true,
+    iframe: true,
+    remoteIframe: true,
+  }
+);
+
+/*
+ * Test relation caching on link
+ */
+addAccessibleTask(
+  `
+  <a id="link" href="#item">a</a>
+  <div id="item">hello</div>
+  <div id="item2">world</div>
+  <a id="link2" href="#anchor">b</a>
+  <a id="namedLink" name="anchor">c</a>`,
+  async function (browser, accDoc) {
+    const link = findAccessibleChildByID(accDoc, "link");
+    const link2 = findAccessibleChildByID(accDoc, "link2");
+    const namedLink = findAccessibleChildByID(accDoc, "namedLink");
+    const item = findAccessibleChildByID(accDoc, "item");
+    const item2 = findAccessibleChildByID(accDoc, "item2");
+
+    await testCachedRelation(link, RELATION_LINKS_TO, item);
+    await testCachedRelation(link2, RELATION_LINKS_TO, namedLink);
+
+    await invokeContentTask(browser, [], () => {
+      content.document.getElementById("link").href = "";
+      content.document.getElementById("namedLink").name = "newName";
+    });
+
+    await testCachedRelation(link, RELATION_LINKS_TO, null);
+    await testCachedRelation(link2, RELATION_LINKS_TO, null);
+
+    await invokeContentTask(browser, [], () => {
+      content.document.getElementById("link").href = "#item2";
+    });
+
+    await testCachedRelation(link, RELATION_LINKS_TO, item2);
+  },
+  {
+    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: true,
+    iframe: true,
+    remoteIframe: true,
+  }
+);
+
+/*
+ * Test relation caching for NODE_CHILD_OF and NODE_PARENT_OF with aria trees.
+ */
+addAccessibleTask(
+  `
+  <div role="tree" id="tree">
+    <div role="treeitem" id="treeitem">test</div>
+    <div role="treeitem" id="treeitem2">test</div>
+  </div>`,
+  async function (browser, accDoc) {
+    const tree = findAccessibleChildByID(accDoc, "tree");
+    const treeItem = findAccessibleChildByID(accDoc, "treeitem");
+    const treeItem2 = findAccessibleChildByID(accDoc, "treeitem2");
+
+    await testCachedRelation(tree, RELATION_NODE_PARENT_OF, [
+      treeItem,
+      treeItem2,
+    ]);
+    await testCachedRelation(treeItem, RELATION_NODE_CHILD_OF, tree);
+  },
+  { chrome: true, iframe: true, remoteIframe: true }
+);
+
+/*
+ * Test relation caching for NODE_CHILD_OF and NODE_PARENT_OF with aria lists.
+ */
+addAccessibleTask(
+  `
+  <div id="l1" role="list">
+    <div id="l1i1" role="listitem" aria-level="1">a</div>
+    <div id="l1i2" role="listitem" aria-level="2">b</div>
+    <div id="l1i3" role="listitem" aria-level="1">c</div>
+  </div>`,
+  async function (browser, accDoc) {
+    const list = findAccessibleChildByID(accDoc, "l1");
+    const listItem1 = findAccessibleChildByID(accDoc, "l1i1");
+    const listItem2 = findAccessibleChildByID(accDoc, "l1i2");
+    const listItem3 = findAccessibleChildByID(accDoc, "l1i3");
+
+    await testCachedRelation(list, RELATION_NODE_PARENT_OF, [
+      listItem1,
+      listItem3,
+    ]);
+    await testCachedRelation(listItem1, RELATION_NODE_CHILD_OF, list);
+    await testCachedRelation(listItem3, RELATION_NODE_CHILD_OF, list);
+
+    await testCachedRelation(listItem1, RELATION_NODE_PARENT_OF, listItem2);
+    await testCachedRelation(listItem2, RELATION_NODE_CHILD_OF, listItem1);
+  },
+  { chrome: true, iframe: true, remoteIframe: true }
+);
+
+/*
+ * Test NODE_CHILD_OF relation caching for JAWS window emulation special case.
+ */
+addAccessibleTask(
+  ``,
+  async function (browser, accDoc) {
+    await testCachedRelation(accDoc, RELATION_NODE_CHILD_OF, accDoc.parent);
+  },
+  { topLevel: true, chrome: true }
+);