Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

36 files changed, 3897 insertions, 0 deletions

diff --git a/dom/promise/tests/chrome.ini b/dom/promise/tests/chrome.ini
new file mode 100644
index 0000000000..1df9608c38
--- /dev/null
+++ b/dom/promise/tests/chrome.ini
@@ -0,0 +1,15 @@
+[DEFAULT]
+
+[test_on_new_promise.html]
+[test_on_promise_settled.html]
+[test_on_promise_settled_duplicates.html]
+[test_promise_xrays.html]
+support-files = file_promise_xrays.html
+[test_promise_argument_xrays.html]
+support-files = file_promise_xrays.html file_promise_argument_tests.js
+skip-if = debug == false
+[test_promise_retval_xrays.html]
+support-files = file_promise_xrays.html file_promise_retval_tests.js
+skip-if = debug == false
+[test_promise_job_with_bind_from_discarded_iframe.html]
+support-files = file_promise_job_with_bind_from_discarded_iframe.html
diff --git a/dom/promise/tests/file_promise_and_timeout_ordering.js b/dom/promise/tests/file_promise_and_timeout_ordering.js
new file mode 100644
index 0000000000..734621eae0
--- /dev/null
+++ b/dom/promise/tests/file_promise_and_timeout_ordering.js
@@ -0,0 +1,18 @@
+var log = [];
+var resolvedPromise = Promise.resolve(null);
+function schedulePromiseTask(f) {
+  resolvedPromise.then(f);
+}
+
+setTimeout(function () {
+  log.push("t1start");
+  schedulePromiseTask(function () {
+    log.push("promise");
+  });
+  log.push("t1end");
+}, 10);
+
+setTimeout(function () {
+  log.push("t2");
+  postMessage(log.join(", "));
+}, 10);
diff --git a/dom/promise/tests/file_promise_argument_tests.js b/dom/promise/tests/file_promise_argument_tests.js
new file mode 100644
index 0000000000..2a3b4e78c9
--- /dev/null
+++ b/dom/promise/tests/file_promise_argument_tests.js
@@ -0,0 +1,175 @@
+/*
+ * This file is meant to provide common infrastructure for several consumers.
+ * The consumer is expected to define the following things:
+ *
+ * 1) An verifyPromiseGlobal function which does whatever test the consumer
+ *    wants.
+ * 2) An isXrayArgumentTest global boolean, because some of these tests act
+ *    differenly based on that boolean.
+ * 3) A function named getPromise.  This function is given a global object and a
+ *    single argument to use for getting the promise.  The getPromise function
+ *    is expected to trigger the canonical Promise.resolve for the given global
+ *    with the given argument in some way that depends on the test, and return
+ *    the result.
+ * 4) A subframe (frames[0]) which can be used as a second global for creating
+ *    promises.
+ */
+
+/* global verifyPromiseGlobal, getPromise, isXrayArgumentTest */
+
+var label = "parent";
+
+function passBasicPromise() {
+  var p1 = Promise.resolve();
+  verifyPromiseGlobal(p1, window, "Promise.resolve return value 1");
+  var p2 = getPromise(window, p1);
+  is(p1, p2, "Basic promise should just pass on through");
+  return p2;
+}
+
+function passPrimitive(global) {
+  var p = getPromise(global, 5);
+  verifyPromiseGlobal(p, global, "Promise wrapping primitive");
+  return p.then(function (arg) {
+    is(arg, 5, "Should have the arg we passed in");
+  });
+}
+
+function passThenable(global) {
+  var called = false;
+  var thenable = {
+    then(f) {
+      called = true;
+      f(7);
+    },
+  };
+  var p = getPromise(global, thenable);
+  verifyPromiseGlobal(p, global, "Promise wrapping thenable");
+  return p.then(function (arg) {
+    ok(called, "Thenable should have been called");
+    is(arg, 7, "Should have the arg our thenable passed in");
+  });
+}
+
+function passWrongPromiseWithMatchingConstructor() {
+  var p1 = Promise.resolve();
+  verifyPromiseGlobal(p1, window, "Promise.resolve() return value 2");
+  p1.constructor = frames[0].Promise;
+  var p2 = getPromise(frames[0], p1);
+  // The behavior here will depend on whether we're touching frames[0] via Xrays
+  // or not.  If we are not, the current compartment while getting our promise
+  // will be that of frames[0].  If we are, it will be our window's compartment.
+  if (isXrayArgumentTest) {
+    isnot(
+      p1,
+      p2,
+      "Should have wrapped the Promise in a new promise, because its constructor is not matching the current-compartment Promise constructor"
+    );
+    verifyPromiseGlobal(
+      p2,
+      window,
+      "Promise wrapping xrayed promise with therefore non-matching constructor"
+    );
+  } else {
+    is(
+      p1,
+      p2,
+      "Should have left the Promise alone because its constructor matched"
+    );
+  }
+  return p2;
+}
+
+function passCorrectPromiseWithMismatchedConstructor() {
+  var p1 = Promise.resolve(9);
+  verifyPromiseGlobal(p1, window, "Promise.resolve() return value 3");
+  p1.constructor = frames[0].Promise;
+  var p2 = getPromise(window, p1);
+  isnot(
+    p1,
+    p2,
+    "Should have wrapped promise in a new promise, since its .constructor was wrong"
+  );
+  verifyPromiseGlobal(
+    p2,
+    window,
+    "Promise wrapping passed-in promise with mismatched constructor"
+  );
+  return p2.then(function (arg) {
+    is(arg, 9, "Should have propagated along our resolution value");
+  });
+}
+
+function passPromiseToOtherGlobal() {
+  var p1 = Promise.resolve();
+  verifyPromiseGlobal(p1, window, "Promise.resolve() return value 4");
+  var p2 = getPromise(frames[0], p1);
+  // The behavior here will depend on whether we're touching frames[0] via Xrays
+  // or not.  If we are not, the current compartment while getting our promise
+  // will be that of frames[0].  If we are, it will be our window's compartment.
+  if (isXrayArgumentTest) {
+    is(
+      p1,
+      p2,
+      "Should have left the Promise alone, because its constructor matches the current compartment's constructor"
+    );
+  } else {
+    isnot(
+      p1,
+      p2,
+      "Should have wrapped promise in a promise from the other global"
+    );
+    verifyPromiseGlobal(
+      p2,
+      frames[0],
+      "Promise wrapping passed-in basic promise"
+    );
+  }
+  return p2;
+}
+
+function passPromiseSubclass() {
+  class PromiseSubclass extends Promise {
+    constructor(func) {
+      super(func);
+    }
+  }
+
+  var p1 = PromiseSubclass.resolve(11);
+  verifyPromiseGlobal(p1, window, "PromiseSubclass.resolve() return value");
+  var p2 = getPromise(window, p1);
+  isnot(p1, p2, "Should have wrapped promise subclass in a new promise");
+  verifyPromiseGlobal(
+    p2,
+    window,
+    "Promise wrapping passed-in promise subclass"
+  );
+  return p2.then(function (arg) {
+    is(
+      arg,
+      11,
+      "Should have propagated along our resolution value from subclass"
+    );
+  });
+}
+
+function runPromiseArgumentTests(finishFunc) {
+  Promise.resolve()
+    .then(passBasicPromise)
+    .then(passPrimitive.bind(undefined, window))
+    .then(passPrimitive.bind(undefined, frames[0]))
+    .then(passThenable.bind(undefined, window))
+    .then(passThenable.bind(undefined, frames[0]))
+    .then(passWrongPromiseWithMatchingConstructor)
+    .then(passCorrectPromiseWithMismatchedConstructor)
+    .then(passPromiseToOtherGlobal)
+    .then(passPromiseSubclass)
+    .then(finishFunc)
+    .catch(function (e) {
+      ok(
+        false,
+        `Exception thrown: ${e}@${location.pathname}:${e.lineNumber}:${e.columnNumber}`
+      );
+      finishFunc();
+    });
+}
diff --git a/dom/promise/tests/file_promise_job_with_bind_from_discarded_iframe.html b/dom/promise/tests/file_promise_job_with_bind_from_discarded_iframe.html
new file mode 100644
index 0000000000..352cf6623e
--- /dev/null
+++ b/dom/promise/tests/file_promise_job_with_bind_from_discarded_iframe.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>iframe in http</title>
+</head>
+<body>
+<div id="result"></div>
+<script type="text/javascript">
+if (typeof SpecialPowers !== "undefined") {
+  document.getElementById("result").textContent = "ok";
+}
+</script>
+</body>
+</html>
diff --git a/dom/promise/tests/file_promise_retval_tests.js b/dom/promise/tests/file_promise_retval_tests.js
new file mode 100644
index 0000000000..37ede9e514
--- /dev/null
+++ b/dom/promise/tests/file_promise_retval_tests.js
@@ -0,0 +1,56 @@
+/*
+ * This file is meant to provide common infrastructure for several consumers.
+ * The consumer is expected to define the following things:
+ *
+ * 1) A verifyPromiseGlobal function which does whatever test the consumer
+ *    wants.  This function is passed a promise and the global whose
+ *    TestFunctions was used to get the promise.
+ * 2) A expectedExceptionGlobal function which is handed the global whose
+ *    TestFunctions was used to trigger the exception and should return the
+ *    global the exception is expected to live in.
+ * 3) A subframe (frames[0]) which can be used as a second global for creating
+ *    promises.
+ */
+
+/* global verifyPromiseGlobal, expectedExceptionGlobal */
+
+var label = "parent";
+
+function testThrownException(global) {
+  var p = global.TestFunctions.throwToRejectPromise();
+  verifyPromiseGlobal(p, global, "throwToRejectPromise return value");
+  return p
+    .then(() => {})
+    .catch(err => {
+      var expected = expectedExceptionGlobal(global);
+      is(
+        SpecialPowers.unwrap(SpecialPowers.Cu.getGlobalForObject(err)),
+        expected,
+        "Should have an exception object from the right global too"
+      );
+      ok(
+        err instanceof expected.DOMException,
+        "Should have a DOMException here"
+      );
+      is(
+        Object.getPrototypeOf(err),
+        expected.DOMException.prototype,
+        "Should have a DOMException from the right global"
+      );
+      is(err.name, "InvalidStateError", "Should have the right DOMException");
+    });
+}
+
+function runPromiseRetvalTests(finishFunc) {
+  Promise.resolve()
+    .then(testThrownException.bind(undefined, window))
+    .then(testThrownException.bind(undefined, frames[0]))
+    .then(finishFunc)
+    .catch(function (e) {
+      ok(
+        false,
+        `Exception thrown: ${e}@${location.pathname}:${e.lineNumber}:${e.columnNumber}`
+      );
+      finishFunc();
+    });
+}
diff --git a/dom/promise/tests/file_promise_xrays.html b/dom/promise/tests/file_promise_xrays.html
new file mode 100644
index 0000000000..e08014a337
--- /dev/null
+++ b/dom/promise/tests/file_promise_xrays.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <script>
+    function vendGetter(name) {
+      // eslint-disable-next-line no-throw-literal
+      return function() { throw "Getting " + String(name); };
+    }
+    function vendSetter(name) {
+      // eslint-disable-next-line no-throw-literal
+      return function() { throw "Setting " + String(name); };
+    }
+    var setupThrew = false;
+    try {
+      // Neuter everything we can think of on Promise.
+      for (var obj of [Promise, Promise.prototype]) {
+        let propNames = Object.getOwnPropertyNames(obj);
+        propNames = propNames.concat(Object.getOwnPropertySymbols(obj));
+        for (var propName of propNames) {
+          if ((propName == "prototype" ||
+               propName == Symbol.hasInstance) &&
+              obj == Promise) {
+            // They're not configurable.
+            continue;
+          }
+          Object.defineProperty(obj, propName,
+            { get: vendGetter(propName), set: vendSetter(propName) });
+        }
+      }
+    } catch (e) {
+      // Something went wrong.  Save that info so the test can check for it.
+      setupThrew = e;
+    }
+  </script>
+</html>
diff --git a/dom/promise/tests/mochitest.ini b/dom/promise/tests/mochitest.ini
new file mode 100644
index 0000000000..bc3c3e4787
--- /dev/null
+++ b/dom/promise/tests/mochitest.ini
@@ -0,0 +1,28 @@
+[DEFAULT]
+support-files =
+  promise_uncatchable_exception.js
+
+[test_bug883683.html]
+[test_promise.html]
+[test_promise_uncatchable_exception.html]
+skip-if = debug == false
+[test_promise_utils.html]
+[test_resolve.html]
+[test_resolver_return_value.html]
+[test_thenable_vs_promise_ordering.html]
+[test_promise_and_timeout_ordering.html]
+support-files = file_promise_and_timeout_ordering.js
+[test_promise_and_timeout_ordering_workers.html]
+support-files = file_promise_and_timeout_ordering.js
+[test_species_getter.html]
+[test_webassembly_compile.html]
+support-files = test_webassembly_compile_sample.wasm test_webassembly_compile_worker.js test_webassembly_compile_worker_terminate.js
+[test_promise_argument.html]
+support-files = file_promise_argument_tests.js
+skip-if = debug == false
+[test_promise_callback_retval.html]
+support-files = file_promise_argument_tests.js
+skip-if = debug == false
+[test_promise_retval.html]
+support-files = file_promise_retval_tests.js
+skip-if = debug == false
diff --git a/dom/promise/tests/promise_uncatchable_exception.js b/dom/promise/tests/promise_uncatchable_exception.js
new file mode 100644
index 0000000000..eafc9e5448
--- /dev/null
+++ b/dom/promise/tests/promise_uncatchable_exception.js
@@ -0,0 +1,11 @@
+/* global TestFunctions */
+
+postMessage("Done", "*");
+
+var p = new Promise(function (resolve, reject) {
+  TestFunctions.throwUncatchableException();
+  ok(false, "Shouldn't get here!");
+}).catch(function (exception) {
+  ok(false, "Shouldn't get here!");
+});
+ok(false, "Shouldn't get here!");
diff --git a/dom/promise/tests/test_bug883683.html b/dom/promise/tests/test_bug883683.html
new file mode 100644
index 0000000000..1b31e32330
--- /dev/null
+++ b/dom/promise/tests/test_bug883683.html
@@ -0,0 +1,41 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Promise - bug 883683</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript"><!--
+
+function runTest() {
+  [{}, {}, {}, {}, {}].reduce(Promise.reject.bind(Promise));
+  ok(true, "No leaks with reject?");
+
+  [{}, {}, {}, {}, {}].reduce(Promise.resolve.bind(Promise));
+  ok(true, "No leaks with resolve?");
+
+  [{}, {}, {}, {}, {}].reduce(function(a, b, c, d) { return new Promise(function(r1, r2) { throw a; }); });
+  ok(true, "No leaks with exception?");
+
+  [{}, {}, {}, {}, {}].reduce(function(a, b, c, d) { return new Promise(function(r1, r2) { }); });
+  ok(true, "No leaks with empty promise?");
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+// -->
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_on_new_promise.html b/dom/promise/tests/test_on_new_promise.html
new file mode 100644
index 0000000000..195707f1d7
--- /dev/null
+++ b/dom/promise/tests/test_on_new_promise.html
@@ -0,0 +1,45 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+
+<!--
+Bug 1083210 - Sanity test for interaction between DOM promises and
+Debugger.prototype.onNewPromise.
+-->
+
+<html>
+<head>
+  <title>Test for interaction with SpiderMonkey's Debugger.prototype.onNewPromise</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+  <script type="application/javascript">
+  is(Object.prototype.toString.call(new Promise(function() {})),
+     "[object Promise]",
+     "We should have the native DOM promise implementation.");
+
+  const {addDebuggerToGlobal} = ChromeUtils.importESModule("resource://gre/modules/jsdebugger.sys.mjs");
+  var dbgGlobal = new Cu.Sandbox(document.nodePrincipal,
+                                 {freshCompartment: true});
+  addDebuggerToGlobal(dbgGlobal);
+  var dbg = new dbgGlobal.Debugger(this);
+
+  var wrappedPromise;
+  dbg.onNewPromise = function(wp) { wrappedPromise = wp; };
+
+  var promise = new Promise(function() {});
+  // eslint-disable-next-line no-debugger
+  debugger;
+  ok(wrappedPromise);
+  is(wrappedPromise.unsafeDereference(), promise);
+  </script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_on_promise_settled.html b/dom/promise/tests/test_on_promise_settled.html
new file mode 100644
index 0000000000..b40475206b
--- /dev/null
+++ b/dom/promise/tests/test_on_promise_settled.html
@@ -0,0 +1,53 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+
+<!--
+Bug 1084065 - Sanity test for interaction between DOM promises and
+Debugger.prototype.onPromiseResolved.
+-->
+
+<html>
+<head>
+  <title>Test for interaction with SpiderMonkey's Debugger.prototype.onNewPromise</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+  <script type="application/javascript">
+  SimpleTest.waitForExplicitFinish();
+
+  is(Object.prototype.toString.call(new Promise(function() {})),
+     "[object Promise]",
+     "We should have the native DOM promise implementation.");
+
+  const {addDebuggerToGlobal} = ChromeUtils.importESModule("resource://gre/modules/jsdebugger.sys.mjs");
+  var dbgGlobal = new Cu.Sandbox(document.nodePrincipal,
+                                 {freshCompartment: true});
+  addDebuggerToGlobal(dbgGlobal);
+  var dbg = new dbgGlobal.Debugger(this);
+
+  var wrappedPromise;
+  dbg.onPromiseSettled = function(wp) { wrappedPromise = wp; };
+
+  var promise = Promise.resolve();
+  promise
+    .then(function() {
+      ok(wrappedPromise);
+      is(wrappedPromise.unsafeDereference(), promise);
+      dbg.onPromiseSettled = undefined;
+    })
+    .catch(function(e) {
+      ok(false, "Got an unexpected error: " + e);
+    })
+    .then(SimpleTest.finish);
+  </script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_on_promise_settled_duplicates.html b/dom/promise/tests/test_on_promise_settled_duplicates.html
new file mode 100644
index 0000000000..e11f4eaa60
--- /dev/null
+++ b/dom/promise/tests/test_on_promise_settled_duplicates.html
@@ -0,0 +1,58 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+
+<!--
+Bug 1084065 - Test that Debugger.prototype.onPromiseResolved doesn't get dupes.
+-->
+
+<html>
+<head>
+  <title>Test for interaction with SpiderMonkey's Debugger.prototype.onNewPromise</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+  <script type="application/javascript">
+  SimpleTest.waitForExplicitFinish();
+
+  is(Object.prototype.toString.call(new Promise(function() {})),
+     "[object Promise]",
+     "We should have the native DOM promise implementation.");
+
+  const {addDebuggerToGlobal} = ChromeUtils.importESModule("resource://gre/modules/jsdebugger.sys.mjs");
+  var dbgGlobal = new Cu.Sandbox(document.nodePrincipal,
+                                 {freshCompartment: true});
+  addDebuggerToGlobal(dbgGlobal);
+  var dbg = new dbgGlobal.Debugger(this);
+
+  var seen = new Set();
+  dbg.onPromiseSettled = function(wp) {
+    is(seen.has(wp), false);
+    seen.add(wp);
+  };
+
+  var promise = new Promise(function(fulfill, reject) {
+    fulfill(1);
+    fulfill(2);
+    fulfill(3);
+  });
+
+  promise
+    .then(function() {
+      dbg.onPromiseSettled = undefined;
+    })
+    .catch(function(e) {
+      ok(false, "Got an unexpected error: " + e);
+    })
+    .then(SimpleTest.finish);
+  </script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise.html b/dom/promise/tests/test_promise.html
new file mode 100644
index 0000000000..7c724daf51
--- /dev/null
+++ b/dom/promise/tests/test_promise.html
@@ -0,0 +1,844 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Basic Promise Test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript"><!--
+
+function promiseResolve() {
+  ok(Promise, "Promise object should exist");
+
+  var promise = new Promise(function(resolve, reject) {
+    ok(resolve, "Promise.resolve exists");
+    ok(reject, "Promise.reject exists");
+
+    resolve(42);
+  });
+  promise.then(function(what) {
+    ok(true, "Then - resolveCb has been called");
+    is(what, 42, "ResolveCb received 42");
+    runTest();
+  }, function() {
+    ok(false, "Then - rejectCb has been called");
+    runTest();
+  });
+}
+
+function promiseResolveNoArg() {
+  var promise = new Promise(function(resolve, reject) {
+    ok(resolve, "Promise.resolve exists");
+    ok(reject, "Promise.reject exists");
+
+    resolve();
+  });
+  promise.then(function(what) {
+    ok(true, "Then - resolveCb has been called");
+    is(what, undefined, "ResolveCb received undefined");
+    runTest();
+  }, function() {
+    ok(false, "Then - rejectCb has been called");
+    runTest();
+  });
+}
+
+function promiseReject() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+  promise.then(function(what) {
+    ok(false, "Then - resolveCb has been called");
+    runTest();
+  }, function(what) {
+    ok(true, "Then - rejectCb has been called");
+    is(what, 42, "RejectCb received 42");
+    runTest();
+  });
+}
+
+function promiseRejectNoHandler() {
+  // This test only checks that the code that reports unhandled errors in the
+  // Promises implementation does not crash or leak.
+
+  new Promise(function(res, rej) {
+    // eslint-disable-next-line no-undef
+    noSuchMethod();
+  });
+  runTest();
+}
+
+function promiseRejectNoArg() {
+  var promise = new Promise(function(resolve, reject) {
+    reject();
+  });
+  promise.then(function(what) {
+    ok(false, "Then - resolveCb has been called");
+    runTest();
+  }, function(what) {
+    ok(true, "Then - rejectCb has been called");
+    is(what, undefined, "RejectCb received undefined");
+    runTest();
+  });
+}
+
+function promiseException() {
+  var promise = new Promise(function(resolve, reject) {
+    // eslint-disable-next-line no-throw-literal
+    throw 42;
+  });
+  promise.then(function(what) {
+    ok(false, "Then - resolveCb has been called");
+    runTest();
+  }, function(what) {
+    ok(true, "Then - rejectCb has been called");
+    is(what, 42, "RejectCb received 42");
+    runTest();
+  });
+}
+
+function promiseGC() {
+  var resolve;
+  var promise = new Promise(function(r1, r2) {
+    resolve = r1;
+  });
+  promise.then(function(what) {
+    ok(true, "Then - promise is still alive");
+    runTest();
+  });
+
+  promise = null;
+
+  SpecialPowers.gc();
+  SpecialPowers.forceGC();
+  SpecialPowers.forceCC();
+
+  resolve(42);
+}
+
+function promiseAsync_TimeoutResolveThen() {
+  var handlerExecuted = false;
+
+  setTimeout(function() {
+    ok(handlerExecuted, "Handler should have been called before the timeout.");
+
+    // Allow other assertions to run so the test could fail before the next one.
+    setTimeout(runTest, 0);
+  }, 0);
+
+  Promise.resolve().then(function() {
+    handlerExecuted = true;
+  });
+
+  ok(!handlerExecuted, "Handlers are not called before 'then' returns.");
+}
+
+function promiseAsync_ResolveTimeoutThen() {
+  var handlerExecuted = false;
+
+  var promise = Promise.resolve();
+
+  setTimeout(function() {
+    ok(handlerExecuted, "Handler should have been called before the timeout.");
+
+    // Allow other assertions to run so the test could fail before the next one.
+    setTimeout(runTest, 0);
+  }, 0);
+
+  promise.then(function() {
+    handlerExecuted = true;
+  });
+
+  ok(!handlerExecuted, "Handlers are not called before 'then' returns.");
+}
+
+function promiseAsync_ResolveThenTimeout() {
+  var handlerExecuted = false;
+
+  Promise.resolve().then(function() {
+    handlerExecuted = true;
+  });
+
+  setTimeout(function() {
+    ok(handlerExecuted, "Handler should have been called before the timeout.");
+
+    // Allow other assertions to run so the test could fail before the next one.
+    setTimeout(runTest, 0);
+  }, 0);
+
+  ok(!handlerExecuted, "Handlers are not called before 'then' returns.");
+}
+
+function promiseAsync_SyncXHR() {
+  var handlerExecuted = false;
+
+  Promise.resolve().then(function() {
+    handlerExecuted = true;
+
+    // Allow other assertions to run so the test could fail before the next one.
+    setTimeout(runTest, 0);
+  });
+
+  ok(!handlerExecuted, "Handlers are not called until the next microtask.");
+
+  var xhr = new XMLHttpRequest();
+  xhr.open("GET", "testXHR.txt", false);
+  xhr.send(null);
+
+  ok(!handlerExecuted, "Sync XHR should not trigger microtask execution.");
+}
+
+function promiseDoubleThen() {
+  var steps = 0;
+  var promise = new Promise(function(r1, r2) {
+    r1(42);
+  });
+
+  promise.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 42, "Value == 42");
+    steps++;
+  }, function(what) {
+    ok(false, "Then.reject has been called");
+  });
+
+  promise.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(steps, 1, "Then.resolve - step == 1");
+    is(what, 42, "Value == 42");
+    runTest();
+  }, function(what) {
+    ok(false, "Then.reject has been called");
+  });
+}
+
+function promiseThenException() {
+  var promise = new Promise(function(resolve, reject) {
+    resolve(42);
+  });
+
+  promise.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    // eslint-disable-next-line no-throw-literal
+    throw "booh";
+  }).catch(function(e) {
+    ok(true, "window.onerror has been called!");
+    runTest();
+  });
+}
+
+function promiseThenCatchThen() {
+  var promise = new Promise(function(resolve, reject) {
+    resolve(42);
+  });
+
+  var promise2 = promise.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 42, "Value == 42");
+    return what + 1;
+  }, function(what) {
+    ok(false, "Then.reject has been called");
+  });
+
+  isnot(promise, promise2, "These 2 promise objs are different");
+
+  promise2.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 43, "Value == 43");
+    return what + 1;
+  }, function(what) {
+    ok(false, "Then.reject has been called");
+  }).catch(function() {
+    ok(false, "Catch has been called");
+  }).then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 44, "Value == 44");
+    runTest();
+  }, function(what) {
+    ok(false, "Then.reject has been called");
+  });
+}
+
+function promiseThenNoArg() {
+  var promise = new Promise(function(resolve, reject) {
+    resolve(42);
+  });
+
+  var clone = promise.then();
+  isnot(promise, clone, "These 2 promise objs are different");
+  promise.then(function(v) {
+    clone.then(function(cv) {
+      is(v, cv, "Both resolve to the same value");
+      runTest();
+    });
+  });
+}
+
+function promiseThenUndefinedResolveFunction() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+
+  try {
+    promise.then(undefined, function(v) {
+      is(v, 42, "Promise rejected with 42");
+      runTest();
+    });
+  } catch (e) {
+    ok(false, "then should not throw on undefined resolve function");
+  }
+}
+
+function promiseThenNullResolveFunction() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+
+  try {
+    promise.then(null, function(v) {
+      is(v, 42, "Promise rejected with 42");
+      runTest();
+    });
+  } catch (e) {
+    ok(false, "then should not throw on null resolve function");
+  }
+}
+
+function promiseRejectThenCatchThen() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+
+  var promise2 = promise.then(function(what) {
+    ok(false, "Then.resolve has been called");
+  }, function(what) {
+    ok(true, "Then.reject has been called");
+    is(what, 42, "Value == 42");
+    return what + 1;
+  });
+
+  isnot(promise, promise2, "These 2 promise objs are different");
+
+  promise2.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 43, "Value == 43");
+    return what + 1;
+  }).catch(function(what) {
+    ok(false, "Catch has been called");
+  }).then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 44, "Value == 44");
+    runTest();
+  });
+}
+
+function promiseRejectThenCatchThen2() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+
+  promise.then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 42, "Value == 42");
+    return what + 1;
+  }).catch(function(what) {
+    is(what, 42, "Value == 42");
+    ok(true, "Catch has been called");
+    return what + 1;
+  }).then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 43, "Value == 43");
+    runTest();
+  });
+}
+
+function promiseRejectThenCatchExceptionThen() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+
+  promise.then(function(what) {
+    ok(false, "Then.resolve has been called");
+  }, function(what) {
+    ok(true, "Then.reject has been called");
+    is(what, 42, "Value == 42");
+    // eslint-disable-next-line no-throw-literal
+    throw (what + 1);
+  }).catch(function(what) {
+    ok(true, "Catch has been called");
+    is(what, 43, "Value == 43");
+    return what + 1;
+  }).then(function(what) {
+    ok(true, "Then.resolve has been called");
+    is(what, 44, "Value == 44");
+    runTest();
+  });
+}
+
+function promiseThenCatchOrderingResolve() {
+  var global = 0;
+  var f = new Promise(function(r1, r2) {
+    r1(42);
+  });
+
+  f.then(function() {
+    f.then(function() {
+      global++;
+    });
+    f.catch(function() {
+      global++;
+    });
+    f.then(function() {
+      global++;
+    });
+    setTimeout(function() {
+      is(global, 2, "Many steps... should return 2");
+      runTest();
+    }, 0);
+  });
+}
+
+function promiseThenCatchOrderingReject() {
+  var global = 0;
+  var f = new Promise(function(r1, r2) {
+    r2(42);
+  });
+
+  f.then(function() {}, function() {
+    f.then(function() {
+      global++;
+    });
+    f.catch(function() {
+      global++;
+    });
+    f.then(function() {}, function() {
+      global++;
+    });
+    setTimeout(function() {
+      is(global, 2, "Many steps... should return 2");
+      runTest();
+    }, 0);
+  });
+}
+
+function promiseCatchNoArg() {
+  var promise = new Promise(function(resolve, reject) {
+    reject(42);
+  });
+
+  var clone = promise.catch();
+  isnot(promise, clone, "These 2 promise objs are different");
+  promise.catch(function(v) {
+    clone.catch(function(cv) {
+      is(v, cv, "Both reject to the same value");
+      runTest();
+    });
+  });
+}
+
+function promiseNestedPromise() {
+  new Promise(function(resolve, reject) {
+    resolve(new Promise(function(res, rej) {
+      ok(true, "Nested promise is executed");
+      res(42);
+    }));
+  }).then(function(value) {
+    is(value, 42, "Nested promise is executed and then == 42");
+    runTest();
+  });
+}
+
+function promiseNestedNestedPromise() {
+  new Promise(function(resolve, reject) {
+    resolve(new Promise(function(res, rej) {
+      ok(true, "Nested promise is executed");
+      res(42);
+    }).then(function(what) { return what + 1; }));
+  }).then(function(value) {
+    is(value, 43, "Nested promise is executed and then == 43");
+    runTest();
+  });
+}
+
+function promiseWrongNestedPromise() {
+  new Promise(function(resolve, reject) {
+    resolve(new Promise(function(r, r2) {
+      ok(true, "Nested promise is executed");
+      r(42);
+    }));
+    reject(42);
+  }).then(function(value) {
+    is(value, 42, "Nested promise is executed and then == 42");
+    runTest();
+  }, function(value) {
+     ok(false, "This is wrong");
+  });
+}
+
+function promiseLoop() {
+  new Promise(function(resolve, reject) {
+    resolve(new Promise(function(res, rej) {
+      ok(true, "Nested promise is executed");
+      res(new Promise(function(resInner, rejInner) {
+        ok(true, "Nested nested promise is executed");
+        resInner(42);
+      }));
+    }));
+  }).then(function(value) {
+    is(value, 42, "Nested nested promise is executed and then == 42");
+    runTest();
+  }, function(value) {
+     ok(false, "This is wrong");
+  });
+}
+
+function promiseStaticReject() {
+  var promise = Promise.reject(42);
+  promise.then(function(what) {
+    ok(false, "This should not be called");
+  }, function(what) {
+    is(what, 42, "Value == 42");
+    runTest();
+  });
+}
+
+function promiseStaticResolve() {
+  var promise = Promise.resolve(42);
+  promise.then(function(what) {
+    is(what, 42, "Value == 42");
+    runTest();
+  }, function() {
+    ok(false, "This should not be called");
+  });
+}
+
+function promiseResolveNestedPromise() {
+  var promise = Promise.resolve(new Promise(function(r, r2) {
+    ok(true, "Nested promise is executed");
+    r(42);
+  }, function() {
+    ok(false, "This should not be called");
+  }));
+  promise.then(function(what) {
+    is(what, 42, "Value == 42");
+    runTest();
+  }, function() {
+    ok(false, "This should not be called");
+  });
+}
+
+function promiseSimpleThenableResolve() {
+  var thenable = { then(resolve) { resolve(5); } };
+  var promise = new Promise(function(resolve, reject) {
+    resolve(thenable);
+  });
+
+  promise.then(function(v) {
+    ok(v === 5, "promiseSimpleThenableResolve");
+    runTest();
+  }, function(e) {
+    ok(false, "promiseSimpleThenableResolve: Should not reject");
+  });
+}
+
+function promiseSimpleThenableReject() {
+  var thenable = { then(resolve, reject) { reject(5); } };
+  var promise = new Promise(function(resolve, reject) {
+    resolve(thenable);
+  });
+
+  promise.then(function() {
+    ok(false, "promiseSimpleThenableReject: Should not resolve");
+    runTest();
+  }, function(e) {
+    ok(e === 5, "promiseSimpleThenableReject");
+    runTest();
+  });
+}
+
+function promiseThenableThrowsBeforeCallback() {
+  var thenable = { then(resolve) {
+    throw new TypeError("Hi there");
+
+    // eslint-disable-next-line no-unreachable
+    resolve(5);
+  }};
+
+  var promise = Promise.resolve(thenable);
+  promise.then(function(v) {
+    ok(false, "promiseThenableThrowsBeforeCallback: Should've rejected");
+    runTest();
+  }, function(e) {
+    ok(e instanceof TypeError, "promiseThenableThrowsBeforeCallback");
+    runTest();
+  });
+}
+
+function promiseThenableThrowsAfterCallback() {
+  var thenable = { then(resolve) {
+    resolve(5);
+    throw new TypeError("Hi there");
+  }};
+
+  var promise = Promise.resolve(thenable);
+  promise.then(function(v) {
+    ok(v === 5, "promiseThenableThrowsAfterCallback");
+    runTest();
+  }, function(e) {
+    ok(false, "promiseThenableThrowsAfterCallback: Should've resolved");
+    runTest();
+  });
+}
+
+function promiseThenableRejectThenResolve() {
+  var thenable = { then(resolve, reject) {
+    reject(new TypeError("Hi there"));
+    resolve(5);
+  }};
+
+  var promise = Promise.resolve(thenable);
+  promise.then(function(v) {
+    ok(false, "promiseThenableRejectThenResolve should have rejected");
+    runTest();
+  }, function(e) {
+    ok(e instanceof TypeError, "promiseThenableRejectThenResolve");
+    runTest();
+  });
+}
+
+function promiseWithThenReplaced() {
+  // Ensure that we call the 'then' on the promise and not the internal then.
+  var promise = new Promise(function(resolve, reject) {
+    resolve(5);
+  });
+
+  // Rogue `then` always rejects.
+  promise.then = function(onFulfill, onReject) {
+    onReject(new TypeError("Foo"));
+  };
+
+  var promise2 = Promise.resolve(promise);
+  promise2.then(function(v) {
+    ok(false, "promiseWithThenReplaced: Should've rejected");
+    runTest();
+  }, function(e) {
+    ok(e instanceof TypeError, "promiseWithThenReplaced");
+    runTest();
+  });
+}
+
+function promiseStrictHandlers() {
+  var promise = Promise.resolve(5);
+  promise.then(function() {
+    "use strict";
+    ok(this === undefined, "Strict mode callback should have this === undefined.");
+    runTest();
+  });
+}
+
+function promiseStrictExecutorThisArg() {
+  new Promise(function(resolve, reject) {
+    "use strict";
+    ok(this === undefined, "thisArg should be undefined.");
+    runTest();
+  });
+}
+
+function promiseResolveArray() {
+  var p = Promise.resolve([1, 2, 3]);
+  ok(p instanceof Promise, "Should return a Promise.");
+  p.then(function(v) {
+    ok(Array.isArray(v), "Resolved value should be an Array");
+    is(v.length, 3, "Length should match");
+    is(v[0], 1, "Resolved value should match original");
+    is(v[1], 2, "Resolved value should match original");
+    is(v[2], 3, "Resolved value should match original");
+    runTest();
+  });
+}
+
+function promiseResolveThenable() {
+  var p = Promise.resolve({ then(onFulfill, onReject) { onFulfill(2); } });
+  ok(p instanceof Promise, "Should cast to a Promise.");
+  p.then(function(v) {
+    is(v, 2, "Should resolve to 2.");
+    runTest();
+  }, function(e) {
+    ok(false, "promiseResolveThenable should've resolved");
+    runTest();
+  });
+}
+
+function promiseResolvePromise() {
+  var original = Promise.resolve(true);
+  var cast = Promise.resolve(original);
+
+  ok(cast instanceof Promise, "Should cast to a Promise.");
+  is(cast, original, "Should return original Promise.");
+  cast.then(function(v) {
+    is(v, true, "Should resolve to true.");
+    runTest();
+  });
+}
+
+// Bug 1009569.
+// Ensure that thenables are run on a clean stack asynchronously.
+// Test case adopted from
+// https://gist.github.com/getify/d64bb01751b50ed6b281#file-bug1-js.
+function promiseResolveThenableCleanStack() {
+  function immed(s) { x++; s(); }
+  function incX() { x++; }
+
+  var x = 0;
+  var thenable = { then: immed };
+  var results = [];
+
+  var p = Promise.resolve(thenable).then(incX);
+  results.push(x);
+
+  // check what happens after all "next cycle" steps
+  // have had a chance to complete
+  setTimeout(function() {
+    // Result should be [0, 2] since `thenable` will be called async.
+    is(results[0], 0, "Expected thenable to be called asynchronously");
+    // See Bug 1023547 comment 13 for why this check has to be gated on p.
+    p.then(function() {
+      results.push(x);
+      is(results[1], 2, "Expected thenable to be called asynchronously");
+      runTest();
+    });
+  }, 1000);
+}
+
+// Bug 1008467 - Promise fails with "too much recursion".
+// The bug was that the callbacks passed to a thenable would resolve the
+// promise synchronously when the fulfill handler returned a non-thenable.
+//
+// For example:
+// var p = new Promise(function(resolve) {
+//   resolve(5);
+// });
+// var m = Promise.resolve(p);
+//
+// At this point `m` is a Promise that is resolved with a thenable `p`, so it
+// calls `p.then()` with two callbacks, both of which would synchronously resolve
+// `m` when `p` invoked them (on account of itself being resolved, possibly
+// synchronously. A chain of these 'Promise resolved by a Promise' would lead to
+// stack overflow.
+function promiseTestAsyncThenableResolution() {
+  var k = 3000;
+  Promise.resolve().then(function next() {
+    k--;
+    if (k > 0) return Promise.resolve().then(next);
+    return undefined;
+  }).then(function() {
+    ok(true, "Resolution of a chain of thenables should not be synchronous.");
+    runTest();
+  });
+}
+
+// Bug 1062323
+function promiseWrapperAsyncResolution() {
+  var p = new Promise(function(resolve, reject) {
+    resolve();
+  });
+
+  var results = [];
+  var q = p.then(function() {
+    results.push("1-1");
+  }).then(function() {
+    results.push("1-2");
+  }).then(function() {
+    results.push("1-3");
+  });
+
+  var r = p.then(function() {
+    results.push("2-1");
+  }).then(function() {
+    results.push("2-2");
+  }).then(function() {
+    results.push("2-3");
+  });
+
+  Promise.all([q, r]).then(function() {
+    var match = results[0] == "1-1" &&
+                results[1] == "2-1" &&
+                results[2] == "1-2" &&
+                results[3] == "2-2" &&
+                results[4] == "1-3" &&
+                results[5] == "2-3";
+                info(results);
+    ok(match, "Chained promises should resolve asynchronously.");
+    runTest();
+  }, function() {
+    ok(false, "promiseWrapperAsyncResolution: One of the promises failed.");
+    runTest();
+  });
+}
+
+var tests = [ promiseResolve, promiseReject,
+              promiseException, promiseGC,
+              promiseAsync_TimeoutResolveThen,
+              promiseAsync_ResolveTimeoutThen,
+              promiseAsync_ResolveThenTimeout,
+              promiseAsync_SyncXHR,
+              promiseDoubleThen, promiseThenException,
+              promiseThenCatchThen, promiseRejectThenCatchThen,
+              promiseRejectThenCatchThen2,
+              promiseRejectThenCatchExceptionThen,
+              promiseThenCatchOrderingResolve,
+              promiseThenCatchOrderingReject,
+              promiseNestedPromise, promiseNestedNestedPromise,
+              promiseWrongNestedPromise, promiseLoop,
+              promiseStaticReject, promiseStaticResolve,
+              promiseResolveNestedPromise,
+              promiseResolveNoArg,
+              promiseRejectNoArg,
+              promiseThenNoArg,
+              promiseThenUndefinedResolveFunction,
+              promiseThenNullResolveFunction,
+              promiseCatchNoArg,
+              promiseRejectNoHandler,
+              promiseSimpleThenableResolve,
+              promiseSimpleThenableReject,
+              promiseThenableThrowsBeforeCallback,
+              promiseThenableThrowsAfterCallback,
+              promiseThenableRejectThenResolve,
+              promiseWithThenReplaced,
+              promiseStrictHandlers,
+              promiseStrictExecutorThisArg,
+              promiseResolveArray,
+              promiseResolveThenable,
+              promiseResolvePromise,
+              promiseResolveThenableCleanStack,
+              promiseTestAsyncThenableResolution,
+              promiseWrapperAsyncResolution,
+            ];
+
+function runTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+runTest();
+// -->
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_and_timeout_ordering.html b/dom/promise/tests/test_promise_and_timeout_ordering.html
new file mode 100644
index 0000000000..e92e928e75
--- /dev/null
+++ b/dom/promise/tests/test_promise_and_timeout_ordering.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for promise and timeout ordering</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+/* global async_test, assert_equals */
+var t = async_test("Promise callbacks should run immediately after the setTimeout handler that enqueues them");
+var origPostMessage = window.postMessage;
+window.postMessage = function(msg) { origPostMessage.call(window, msg, "*"); };
+window.onmessage = t.step_func_done(function(e) {
+  assert_equals(e.data, "t1start, t1end, promise, t2");
+});
+</script>
+<script src="file_promise_and_timeout_ordering.js"></script>
diff --git a/dom/promise/tests/test_promise_and_timeout_ordering_workers.html b/dom/promise/tests/test_promise_and_timeout_ordering_workers.html
new file mode 100644
index 0000000000..85fd4c0019
--- /dev/null
+++ b/dom/promise/tests/test_promise_and_timeout_ordering_workers.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for promise and timeout ordering in workers</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+/* global async_test, assert_equals */
+var t = async_test("Promise callbacks in workers should run immediately after the setTimeout handler that enqueues them");
+var w = new Worker("file_promise_and_timeout_ordering.js");
+w.onmessage = t.step_func_done(function(e) {
+  assert_equals(e.data, "t1start, t1end, promise, t2");
+});
+</script>
diff --git a/dom/promise/tests/test_promise_argument.html b/dom/promise/tests/test_promise_argument.html
new file mode 100644
index 0000000000..22343ef00f
--- /dev/null
+++ b/dom/promise/tests/test_promise_argument.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1323324
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1323324</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script src="file_promise_argument_tests.js"></script>
+  <script type="application/javascript">
+  /** Test for Bug 1323324 **/
+  SimpleTest.waitForExplicitFinish();
+
+  var globalWrapper;
+  function verifyPromiseGlobal(p, global, msg) {
+    // SpecialPowers.Cu.getGlobalForObject returns a SpecialPowers wrapper for
+    // the actual global.  We want to grab the underlying object.
+    globalWrapper = SpecialPowers.Cu.getGlobalForObject(p);
+    is(SpecialPowers.unwrap(globalWrapper), global,
+       msg + " should come from " + global.label);
+  }
+
+  const isXrayArgumentTest = false;
+
+  function getPromise(global, arg) {
+    return global.TestFunctions.passThroughPromise(arg);
+  }
+
+  addLoadEvent(function() {
+    frames[0].label = "child";
+    SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]},
+                              runPromiseArgumentTests.bind(undefined,
+                                                           SimpleTest.finish));
+  });
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1323324">Mozilla Bug 1323324</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <!-- A subframe so we have another global to work with -->
+  <iframe></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_argument_xrays.html b/dom/promise/tests/test_promise_argument_xrays.html
new file mode 100644
index 0000000000..f3a234cf6d
--- /dev/null
+++ b/dom/promise/tests/test_promise_argument_xrays.html
@@ -0,0 +1,90 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1233324
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1233324</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1233324">Mozilla Bug 1233324</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe id="t" src="http://example.org/chrome/dom/promise/tests/file_promise_xrays.html"></iframe>
+</div>
+
+<pre id="test">
+<script src="file_promise_argument_tests.js"></script>
+<script type="application/javascript">
+
+var win = $("t").contentWindow;
+
+/** Test for Bug 1233324 **/
+SimpleTest.waitForExplicitFinish();
+
+function testLoadComplete() {
+  is(win.location.href, $("t").src, "Should have loaded the right thing");
+  nextTest();
+}
+
+function testHaveXray() {
+  is(typeof win.Promise.race, "function", "Should see a race() function");
+  var exception;
+  try {
+    win.Promise.wrappedJSObject.race;
+  } catch (e) {
+    exception = e;
+  }
+  is(exception, "Getting race", "Should have thrown the right exception");
+  is(win.wrappedJSObject.setupThrew, false, "Setup should not have thrown");
+  nextTest();
+}
+
+function verifyPromiseGlobal(p, _, msg) {
+  // SpecialPowers.Cu.getGlobalForObject returns a SpecialPowers wrapper for
+  // the actual global.  We want to grab the underlying object.
+  var global = SpecialPowers.unwrap(SpecialPowers.Cu.getGlobalForObject(p));
+
+  // We expect our global to always be "window" here, because we're working over
+  // Xrays.
+  is(global, window, msg + " should come from " + window.label);
+}
+
+const isXrayArgumentTest = true;
+
+function getPromise(global, arg) {
+  return global.TestFunctions.passThroughPromise(arg);
+}
+
+function testPromiseArgumentConversions() {
+  runPromiseArgumentTests(nextTest);
+}
+
+var tests = [
+  testLoadComplete,
+  testHaveXray,
+  testPromiseArgumentConversions,
+];
+
+function nextTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+  tests.shift()();
+}
+
+addLoadEvent(function() {
+  frames[0].label = "child";
+  SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]},
+                            nextTest);
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_callback_retval.html b/dom/promise/tests/test_promise_callback_retval.html
new file mode 100644
index 0000000000..332c370a3e
--- /dev/null
+++ b/dom/promise/tests/test_promise_callback_retval.html
@@ -0,0 +1,53 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1323324
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1323324</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script src="file_promise_argument_tests.js"></script>
+  <script type="application/javascript">
+  /* global TestFunctions */
+
+  /** Test for Bug 1323324 **/
+  SimpleTest.waitForExplicitFinish();
+
+  var globalWrapper;
+  function verifyPromiseGlobal(p, global, msg) {
+    // SpecialPowers.Cu.getGlobalForObject returns a SpecialPowers wrapper for
+    // the actual global.  We want to grab the underlying object.
+    globalWrapper = SpecialPowers.Cu.getGlobalForObject(p);
+    is(SpecialPowers.unwrap(globalWrapper), global,
+       msg + " should come from " + global.label);
+  }
+
+  const isXrayArgumentTest = false;
+
+  var func;
+  function getPromise(global, arg) {
+    func = new global.Function("x", "return x").bind(undefined, arg);
+    return TestFunctions.passThroughCallbackPromise(func);
+  }
+
+  addLoadEvent(function() {
+    frames[0].label = "child";
+    SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]},
+                              runPromiseArgumentTests.bind(undefined,
+                                                           SimpleTest.finish));
+  });
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1323324">Mozilla Bug 1323324</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <!-- A subframe so we have another global to work with -->
+  <iframe></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_job_with_bind_from_discarded_iframe.html b/dom/promise/tests/test_promise_job_with_bind_from_discarded_iframe.html
new file mode 100644
index 0000000000..1cea250072
--- /dev/null
+++ b/dom/promise/tests/test_promise_job_with_bind_from_discarded_iframe.html
@@ -0,0 +1,63 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1723124.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1723124.</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1723124.">Mozilla Bug 1723124.</a>
+
+<iframe id="frame" src="http://example.org/chrome/dom/promise/tests/file_promise_job_with_bind_from_discarded_iframe.html"></iframe>
+
+<pre id="test">
+<script type="text/javascript">
+/** Test for Bug 1723124. **/
+SimpleTest.waitForExplicitFinish();
+
+var frame = document.getElementById("frame");
+
+SimpleTest.waitForCondition(() => {
+  var result = frame.contentDocument.getElementById("result");
+  if (!result) {
+    return false;
+  }
+  // Wait for the iframe's script to check if it has no access to SpecialPowers.
+  return result.textContent == "ok";
+}, () => {
+  var iframe_bind = frame.contentWindow.Function.prototype.bind;
+  // Removing iframe from the tree discards the browsing context,
+  // and promise jobs in the iframe global stops working.
+  frame.remove();
+
+  Promise.resolve(10)
+    .then(function (v) {
+      // Handler in top-level realm, without bind.
+      //
+      // This job is created with the top-level realm, and should be called.
+      is(v, 10, "normal function should get the value from promise");
+      return 20;
+    }, function () {
+      ok(false, "unexpectedly rejected");
+    })
+    .then(iframe_bind.call(function (bound_arg, v) {
+      // Handler in top-level realm, with bind in discarded iframe.
+      //
+      // This job is also created with the top-level realm, and should be
+      // called.
+      is(v, 20, "bound function should get the value from promise");
+      is(bound_arg, 30, "bound function should get the arguments from bind");
+      SimpleTest.finish();
+    }, this, 30), function () {
+      ok(false, "unexpectedly rejected");
+    });
+});
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_retval.html b/dom/promise/tests/test_promise_retval.html
new file mode 100644
index 0000000000..e425b8e203
--- /dev/null
+++ b/dom/promise/tests/test_promise_retval.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1436276.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1436276.</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script src="file_promise_retval_tests.js"></script>
+  <script type="application/javascript">
+  /** Test for Bug 1436276. **/
+  SimpleTest.waitForExplicitFinish();
+
+  function verifyPromiseGlobal(p, global, msg) {
+    // SpecialPowers.Cu.getGlobalForObject returns a SpecialPowers wrapper for
+    // the actual global.  We want to grab the underlying object.
+    var globalWrapper = SpecialPowers.Cu.getGlobalForObject(p);
+    is(SpecialPowers.unwrap(globalWrapper), global,
+       msg + " should come from " + global.label);
+  }
+
+  function expectedExceptionGlobal(global) {
+    // We should end up with an exception from "global".
+    return global;
+  }
+
+  function getPromise(global, arg) {
+    return global.TestFunctions.passThroughPromise(arg);
+  }
+
+  addLoadEvent(function() {
+    frames[0].label = "child";
+    SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]},
+                              runPromiseRetvalTests.bind(undefined,
+                                                         SimpleTest.finish));
+  });
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1323324">Mozilla Bug 1323324</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <!-- A subframe so we have another global to work with -->
+  <iframe></iframe>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_retval_xrays.html b/dom/promise/tests/test_promise_retval_xrays.html
new file mode 100644
index 0000000000..1270e3a3bb
--- /dev/null
+++ b/dom/promise/tests/test_promise_retval_xrays.html
@@ -0,0 +1,94 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1436276.
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1436276.</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1436276.">Mozilla Bug 1436276.</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe id="t" src="http://example.org/chrome/dom/promise/tests/file_promise_xrays.html"></iframe>
+</div>
+
+<pre id="test">
+<script src="file_promise_retval_tests.js"></script>
+<script type="application/javascript">
+
+var win = $("t").contentWindow;
+
+/** Test for Bug 1233324 **/
+SimpleTest.waitForExplicitFinish();
+
+function testLoadComplete() {
+  is(win.location.href, $("t").src, "Should have loaded the right thing");
+  nextTest();
+}
+
+function testHaveXray() {
+  is(typeof win.Promise.race, "function", "Should see a race() function");
+  var exception;
+  try {
+    win.Promise.wrappedJSObject.race;
+  } catch (e) {
+    exception = e;
+  }
+  is(exception, "Getting race", "Should have thrown the right exception");
+  is(win.wrappedJSObject.setupThrew, false, "Setup should not have thrown");
+  nextTest();
+}
+
+function verifyPromiseGlobal(p, _, msg) {
+  // SpecialPowers.Cu.getGlobalForObject returns a SpecialPowers wrapper for
+  // the actual global.  We want to grab the underlying object.
+  var global = SpecialPowers.unwrap(SpecialPowers.Cu.getGlobalForObject(p));
+
+  // We expect our global to always be "window" here, because we're working over
+  // Xrays.
+  is(global, window, msg + " should come from " + window.label);
+}
+
+function expectedExceptionGlobal(_) {
+  // We should end up with an exception from "window" no matter what global
+  // was involved to start with, because we're working over Xrays.
+  return window;
+}
+
+function getPromise(global, arg) {
+  return global.TestFunctions.passThroughPromise(arg);
+}
+
+function testPromiseRetvals() {
+  runPromiseRetvalTests(nextTest);
+}
+
+var tests = [
+  testLoadComplete,
+  testHaveXray,
+  testPromiseRetvals,
+];
+
+function nextTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+  tests.shift()();
+}
+
+addLoadEvent(function() {
+  frames[0].label = "child";
+  SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]},
+                            nextTest);
+});
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_uncatchable_exception.html b/dom/promise/tests/test_promise_uncatchable_exception.html
new file mode 100644
index 0000000000..2bb6f1fe17
--- /dev/null
+++ b/dom/promise/tests/test_promise_uncatchable_exception.html
@@ -0,0 +1,35 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Promise - uncatchable exceptions</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+onmessage = function(evt) {
+  ok(true, "finished");
+  SimpleTest.finish();
+};
+
+function go() {
+  var script = document.createElement("script");
+  script.src = "promise_uncatchable_exception.js";
+  document.body.appendChild(script);
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]}, go);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_utils.html b/dom/promise/tests/test_promise_utils.html
new file mode 100644
index 0000000000..b20d909351
--- /dev/null
+++ b/dom/promise/tests/test_promise_utils.html
@@ -0,0 +1,313 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Test for Promise.all, Promise.race</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript"><!--
+
+function promiseUtilitiesDefined() {
+  ok(Promise.all, "Promise.all must be defined when Promise is enabled.");
+  ok(Promise.race, "Promise.race must be defined when Promise is enabled.");
+  runTest();
+}
+
+function promiseAllEmptyArray() {
+  var p = Promise.all([]);
+  ok(p instanceof Promise, "Return value of Promise.all should be a Promise.");
+  p.then(function(values) {
+    ok(Array.isArray(values), "Resolved value should be an array.");
+    is(values.length, 0, "Resolved array length should match iterable's length.");
+    runTest();
+  }, function() {
+    ok(false, "Promise.all shouldn't fail when iterable has no rejected Promises.");
+    runTest();
+  });
+}
+
+function promiseAllArray() {
+  var p = Promise.all([1, new Date(), Promise.resolve("firefox")]);
+  ok(p instanceof Promise, "Return value of Promise.all should be a Promise.");
+  p.then(function(values) {
+    ok(Array.isArray(values), "Resolved value should be an array.");
+    is(values.length, 3, "Resolved array length should match iterable's length.");
+    is(values[0], 1, "Array values should match.");
+    ok(values[1] instanceof Date, "Array values should match.");
+    is(values[2], "firefox", "Array values should match.");
+    runTest();
+  }, function() {
+    ok(false, "Promise.all shouldn't fail when iterable has no rejected Promises.");
+    runTest();
+  });
+}
+
+function promiseAllIterable() {
+  function* promiseGen() {
+    var i = 3;
+    while (--i) {
+      yield Promise.resolve(i);
+    }
+
+    yield new Promise(function(resolve) {
+      setTimeout(resolve, 10);
+    });
+  }
+
+  Promise.all(promiseGen()).then(function(values) {
+    is(values.length, 3, "Resolved array length should match iterable's length.");
+    is(values[0], 2, "Array values should match.");
+    is(values[1], 1, "Array values should match.");
+    is(values[2], undefined, "Array values should match.");
+    runTest();
+  }, function(e) {
+    ok(false, "Promise.all shouldn't fail when an iterable is passed.");
+    runTest();
+  });
+}
+
+function promiseAllWaitsForAllPromises() {
+  var arr = [
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, 1), 50);
+    }),
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, 2), 10);
+    }),
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, new Promise(function(resolve2) {
+        resolve2(3);
+      })), 10);
+    }),
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, 4), 20);
+    }),
+  ];
+
+  var p = Promise.all(arr);
+  p.then(function(values) {
+    ok(Array.isArray(values), "Resolved value should be an array.");
+    is(values.length, 4, "Resolved array length should match iterable's length.");
+    is(values[0], 1, "Array values should match.");
+    is(values[1], 2, "Array values should match.");
+    is(values[2], 3, "Array values should match.");
+    is(values[3], 4, "Array values should match.");
+    runTest();
+  }, function() {
+    ok(false, "Promise.all shouldn't fail when iterable has no rejected Promises.");
+    runTest();
+  });
+}
+
+function promiseAllRejectFails() {
+  var arr = [
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, 1), 50);
+    }),
+    new Promise(function(resolve, reject) {
+      setTimeout(reject.bind(undefined, 2), 10);
+    }),
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, 3), 10);
+    }),
+    new Promise(function(resolve) {
+      setTimeout(resolve.bind(undefined, 4), 20);
+    }),
+  ];
+
+  var p = Promise.all(arr);
+  p.then(function(values) {
+    ok(false, "Promise.all shouldn't resolve when iterable has rejected Promises.");
+    runTest();
+  }, function(e) {
+    ok(true, "Promise.all should reject when iterable has rejected Promises.");
+    is(e, 2, "Rejection value should match.");
+    runTest();
+  });
+}
+
+function promiseAllCastError() {
+  var p = Promise.all([Promise.resolve(2), { then() {
+    throw new ReferenceError("placeholder for nonexistent function call");
+  } }]);
+  ok(p instanceof Promise, "Should cast to a Promise.");
+  p.then(function(v) {
+    ok(false, "promiseAllCastError: should've rejected.");
+    runTest();
+  }, function(e) {
+    ok(e instanceof ReferenceError, "promiseCastThenableError");
+    runTest();
+  });
+}
+
+// Check that the resolved array is enumerable.
+function promiseAllEnumerable() {
+  var p = Promise.all([1, new Date(), Promise.resolve("firefox")]);
+  p.then(function(v) {
+    var count = 0;
+    for (let key in v) {
+      ++count;
+      ok(v[key] === 1 || v[key] instanceof Date || v[key] === "firefox",
+         "Enumerated properties don't match.");
+    }
+    is(count, 3, "Resolved array from Promise.all should be enumerable");
+    runTest();
+  }, function(e) {
+    ok(false, "promiseAllEnumerable: should've resolved.");
+    runTest();
+  });
+}
+
+function promiseRaceEmpty() {
+  var p = Promise.race([]);
+  ok(p instanceof Promise, "Should return a Promise.");
+  p.then(function() {
+    ok(false, "Should not resolve");
+  }, function() {
+    ok(false, "Should not reject");
+  });
+  // Per spec, An empty race never resolves or rejects.
+  setTimeout(function() {
+    ok(true);
+    runTest();
+  }, 50);
+}
+
+function promiseRaceValuesArray() {
+  var p = Promise.race([true, new Date(), 3]);
+  ok(p instanceof Promise, "Should return a Promise.");
+  p.then(function(winner) {
+    is(winner, true, "First value should win.");
+    runTest();
+  }, function(err) {
+    ok(false, "Should not fail " + err + ".");
+    runTest();
+  });
+}
+
+function promiseRacePromiseArray() {
+  var arr = [
+    new Promise(function(resolve) {
+      resolve("first");
+    }),
+    Promise.resolve("second"),
+    new Promise(function() {}),
+    new Promise(function(resolve) {
+      setTimeout(function() {
+        setTimeout(function() {
+          resolve("fourth");
+        }, 0);
+      }, 0);
+    }),
+  ];
+
+  var p = Promise.race(arr);
+  p.then(function(winner) {
+    is(winner, "first", "First queued resolution should win the race.");
+    runTest();
+  });
+}
+
+function promiseRaceIterable() {
+  function* participants() {
+    yield new Promise(function(resolve) {
+      setTimeout(resolve, 10, 10);
+    });
+    yield new Promise(function(resolve) {
+      setTimeout(resolve, 20, 20);
+    });
+  }
+
+  Promise.race(participants()).then(function(winner) {
+    is(winner, 10, "Winner should be the one that finished earlier.");
+    runTest();
+  }, function(e) {
+    ok(false, "Promise.race shouldn't throw when an iterable is passed!");
+    runTest();
+  });
+}
+
+function promiseRaceReject() {
+  var p = Promise.race([
+    Promise.reject(new Error("Fail bad!")),
+    new Promise(function(resolve) {
+      setTimeout(resolve, 0);
+    }),
+  ]);
+
+  p.then(function() {
+    ok(false, "Should not resolve when winning Promise rejected.");
+    runTest();
+  }, function(e) {
+    ok(true, "Should be rejected");
+    ok(e instanceof Error, "Should reject with Error.");
+    ok(e.message == "Fail bad!", "Message should match.");
+    runTest();
+  });
+}
+
+function promiseRaceThrow() {
+  var p = Promise.race([
+    new Promise(function(resolve) {
+      throw new ReferenceError("placeholder for nonexistent function call");
+    }),
+    new Promise(function(resolve) {
+      setTimeout(resolve, 0);
+    }),
+  ]);
+
+  p.then(function() {
+    ok(false, "Should not resolve when winning Promise had an error.");
+    runTest();
+  }, function(e) {
+    ok(true, "Should be rejected");
+    ok(e instanceof ReferenceError, "Should reject with ReferenceError for function nonExistent().");
+    runTest();
+  });
+}
+
+var tests = [
+              promiseUtilitiesDefined,
+              promiseAllEmptyArray,
+              promiseAllArray,
+              promiseAllIterable,
+              promiseAllWaitsForAllPromises,
+              promiseAllRejectFails,
+              promiseAllCastError,
+              promiseAllEnumerable,
+
+              promiseRaceEmpty,
+              promiseRaceValuesArray,
+              promiseRacePromiseArray,
+              promiseRaceIterable,
+              promiseRaceReject,
+              promiseRaceThrow,
+            ];
+
+function runTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("untriaged");
+runTest();
+// -->
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_promise_xrays.html b/dom/promise/tests/test_promise_xrays.html
new file mode 100644
index 0000000000..8559dbb2a4
--- /dev/null
+++ b/dom/promise/tests/test_promise_xrays.html
@@ -0,0 +1,365 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1170760
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1170760</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://global/skin"/>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1170760">Mozilla Bug 1170760</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+<iframe id="t" src="http://example.org/chrome/dom/promise/tests/file_promise_xrays.html"></iframe>
+</div>
+
+<pre id="test">
+<script type="application/javascript">
+
+var win = $("t").contentWindow;
+
+/** Test for Bug 1170760 **/
+SimpleTest.waitForExplicitFinish();
+
+function testLoadComplete() {
+  is(win.location.href, $("t").src, "Should have loaded the right thing");
+  nextTest();
+}
+
+function testHaveXray() {
+  is(typeof win.Promise.race, "function", "Should see a race() function");
+  var exception;
+  try {
+    win.Promise.wrappedJSObject.race;
+  } catch (e) {
+    exception = e;
+  }
+  is(exception, "Getting race", "Should have thrown the right exception");
+  is(win.wrappedJSObject.setupThrew, false, "Setup should not have thrown");
+  nextTest();
+}
+
+function testConstructor1() {
+  var p = new win.Promise(function(resolve, reject) { resolve(win.Promise.resolve(5)); });
+  p.then(
+    function(arg) {
+      is(arg, 5, "Content Promise constructor resolved with content promise should work");
+    },
+    function(e) {
+      ok(false, "Content Promise constructor resolved with content promise should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testConstructor2() {
+  var p = new win.Promise(function(resolve, reject) { resolve(Promise.resolve(5)); });
+  p.then(
+    function(arg) {
+      is(arg, 5, "Content Promise constructor resolved with chrome promise should work");
+    },
+    function(e) {
+      ok(false, "Content Promise constructor resolved with chrome promise should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testRace1() {
+  var p = win.Promise.race(new win.Array(1, 2));
+  p.then(
+    function(arg) {
+      ok(arg == 1 || arg == 2,
+         "Should get the right value when racing content-side array");
+    },
+    function(e) {
+      ok(false, "testRace1 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testRace2() {
+  var p = win.Promise.race(
+    [win.Promise.resolve(1), win.Promise.resolve(2)]);
+  p.then(
+    function(arg) {
+      ok(arg == 1 || arg == 2,
+         "Should get the right value when racing content-side array of explicit Promises");
+    },
+    function(e) {
+      ok(false, "testRace2 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testRace3() {
+  // This works with a chrome-side array because we do the iteration
+  // while still in the Xray compartment.
+  var p = win.Promise.race([1, 2]);
+  p.then(
+    function(arg) {
+      ok(arg == 1 || arg == 2,
+         "Should get the right value when racing chrome-side array");
+    },
+    function(e) {
+      ok(false, "testRace3 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testRace4() {
+  // This works with both content-side and chrome-side Promises because we want
+  // it to and go to some lengths to make it work.
+  var p = win.Promise.race([Promise.resolve(1), win.Promise.resolve(2)]);
+  p.then(
+    function(arg) {
+      ok(arg == 1 || arg == 2,
+         "Should get the right value when racing chrome-side promises");
+    },
+    function(e) {
+      ok(false, "testRace4 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testAll1() {
+  var p = win.Promise.all(new win.Array(1, 2));
+  p.then(
+    function(arg) {
+      ok(arg instanceof win.Array, "Should get an Array from Promise.all (1)");
+      is(arg[0], 1, "First entry of Promise.all return value should be correct (1)");
+      is(arg[1], 2, "Second entry of Promise.all return value should be correct (1)");
+    },
+    function(e) {
+      ok(false, "testAll1 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testAll2() {
+  var p = win.Promise.all(
+    [win.Promise.resolve(1), win.Promise.resolve(2)]);
+  p.then(
+    function(arg) {
+      ok(arg instanceof win.Array, "Should get an Array from Promise.all (2)");
+      is(arg[0], 1, "First entry of Promise.all return value should be correct (2)");
+      is(arg[1], 2, "Second entry of Promise.all return value should be correct (2)");
+    },
+    function(e) {
+      ok(false, "testAll2 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testAll3() {
+  // This works with a chrome-side array because we do the iteration
+  // while still in the Xray compartment.
+  var p = win.Promise.all([1, 2]);
+  p.then(
+    function(arg) {
+      ok(arg instanceof win.Array, "Should get an Array from Promise.all (3)");
+      is(arg[0], 1, "First entry of Promise.all return value should be correct (3)");
+      is(arg[1], 2, "Second entry of Promise.all return value should be correct (3)");
+    },
+    function(e) {
+      ok(false, "testAll3 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testAll4() {
+  // This works with both content-side and chrome-side Promises because we want
+  // it to and go to some lengths to make it work.
+  var p = win.Promise.all([Promise.resolve(1), win.Promise.resolve(2)]);
+  p.then(
+    function(arg) {
+      ok(arg instanceof win.Array, "Should get an Array from Promise.all (4)");
+      is(arg[0], 1, "First entry of Promise.all return value should be correct (4)");
+      is(arg[1], 2, "Second entry of Promise.all return value should be correct (4)");
+    },
+    function(e) {
+      ok(false, "testAll4 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testAll5() {
+  var p = win.Promise.all(new win.Array());
+  p.then(
+    function(arg) {
+      ok(arg instanceof win.Array, "Should get an Array from Promise.all (5)");
+    },
+    function(e) {
+      ok(false, "testAll5 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testResolve1() {
+  var p = win.Promise.resolve(5);
+  ok(p instanceof win.Promise, "Promise.resolve should return a promise");
+  p.then(
+    function(arg) {
+      is(arg, 5, "Should get correct Promise.resolve value");
+    },
+    function(e) {
+      ok(false, "testAll5 threw exception: " + e);
+    }
+  ).then(nextTest);
+}
+
+function testResolve2() {
+  var p = win.Promise.resolve(5);
+  var q = win.Promise.resolve(p);
+  is(q, p, "Promise.resolve should just pass through Promise values");
+  nextTest();
+}
+
+function testResolve3() {
+  var p = win.Promise.resolve(Promise.resolve(5));
+  p.then(
+    function(arg) {
+      is(arg, 5, "Promise.resolve with chrome Promise should work");
+    },
+    function(e) {
+      ok(false, "Promise.resolve with chrome Promise should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testResolve4() {
+  var p = new win.Promise((res, rej) => {});
+  Cu.getJSTestingFunctions().resolvePromise(p, 42);
+  p.then(
+    function(arg) {
+      is(arg, 42, "Resolving an Xray to a promise with TestingFunctions resolvePromise should work");
+    },
+    function(e) {
+      ok(false, "Resolving an Xray to a promise with TestingFunctions resolvePromise should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testReject1() {
+  var p = win.Promise.reject(5);
+  ok(p instanceof win.Promise, "Promise.reject should return a promise");
+  p.then(
+    function(arg) {
+      ok(false, "Promise should be rejected");
+    },
+    function(e) {
+      is(e, 5, "Should get correct Promise.reject value");
+    }
+  ).then(nextTest);
+}
+
+function testReject2() {
+  var p = new win.Promise((res, rej) => {});
+  Cu.getJSTestingFunctions().rejectPromise(p, 42);
+  p.then(
+    function(arg) {
+      ok(false, "Rejecting an Xray to a promise with TestingFunctions rejectPromise should trigger catch handler");
+    },
+    function(e) {
+      is(e, 42, "Rejecting an Xray to a promise with TestingFunctions rejectPromise should work");
+    }
+  ).then(nextTest);
+}
+
+function testThen1() {
+  var p = win.Promise.resolve(5);
+  var q = p.then((x) => x * x);
+  ok(q instanceof win.Promise,
+     "Promise.then should return a promise from the right global");
+  q.then(
+    function(arg) {
+      is(arg, 25, "Promise.then should work");
+    },
+    function(e) {
+      ok(false, "Promise.then should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testThen2() {
+  var p = win.Promise.resolve(5);
+  var q = p.then((x) => Promise.resolve(x * x));
+  ok(q instanceof win.Promise,
+     "Promise.then should return a promise from the right global");
+  q.then(
+    function(arg) {
+      is(arg, 25, "Promise.then resolved with chrome promise should work");
+    },
+    function(e) {
+      ok(false, "Promise.then resolved with chrome promise should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testCatch1() {
+  var p = win.Promise.reject(5);
+  ok(p instanceof win.Promise, "Promise.reject should return a promise");
+  var q = p.catch((x) => x * x);
+  ok(q instanceof win.Promise,
+     "Promise.catch should return a promise from the right global");
+  q.then(
+    function(arg) {
+      is(arg, 25, "Promise.catch should work");
+    },
+    function(e) {
+      ok(false, "Promise.catch should not fail");
+    }
+  ).then(nextTest);
+}
+
+function testToStringTag1() {
+  is(win.Promise.prototype[Symbol.toStringTag], "Promise", "@@toStringTag was incorrect");
+  var p = win.Promise.resolve();
+  is(String(p), "[object Promise]", "String() result was incorrect");
+  is(p.toString(), "[object Promise]", "toString result was incorrect");
+  is(Object.prototype.toString.call(p), "[object Promise]", "second toString result was incorrect");
+  nextTest();
+}
+
+var tests = [
+  testLoadComplete,
+  testHaveXray,
+  testConstructor1,
+  testConstructor2,
+  testRace1,
+  testRace2,
+  testRace3,
+  testRace4,
+  testAll1,
+  testAll2,
+  testAll3,
+  testAll4,
+  testAll5,
+  testResolve1,
+  testResolve2,
+  testResolve3,
+  testResolve4,
+  testReject1,
+  testReject2,
+  testThen1,
+  testThen2,
+  testCatch1,
+  testToStringTag1,
+];
+
+function nextTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+  tests.shift()();
+}
+
+addLoadEvent(nextTest);
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_resolve.html b/dom/promise/tests/test_resolve.html
new file mode 100644
index 0000000000..7e4745b47a
--- /dev/null
+++ b/dom/promise/tests/test_resolve.html
@@ -0,0 +1,66 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>Promise.resolve(anything) Test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript"><!--
+
+var tests = [
+  null,
+  42,
+  "hello world",
+  true,
+  false,
+  {},
+  { a: 42 },
+  [ 1, 2, 3, 4, null, true, "hello world" ],
+  function() {},
+  window,
+  undefined,
+  document.createElement("input"),
+  new Date(),
+];
+
+function cbError() {
+  ok(false, "Nothing should arrive here!");
+}
+
+function runTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.pop();
+
+  new Promise(function(resolve, reject) {
+    resolve(test);
+  }).then(function(what) {
+    ok(test === what, "What is: " + what);
+  }, cbError).then(function() {
+    new Promise(function(resolve, reject) {
+      reject(test);
+    }).then(cbError, function(what) {
+      ok(test === what, "What is: " + what);
+    }).then(runTest, cbError);
+  });
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+// -->
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_resolver_return_value.html b/dom/promise/tests/test_resolver_return_value.html
new file mode 100644
index 0000000000..82e8793824
--- /dev/null
+++ b/dom/promise/tests/test_resolver_return_value.html
@@ -0,0 +1,40 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1120235
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1120235</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 1120235 **/
+  var res, rej;
+  var p = new Promise(function(resolve, reject) { res = resolve; rej = reject; });
+  is(res(1), undefined, "Resolve function should return undefined");
+  is(rej(2), undefined, "Reject function should return undefined");
+
+  var thenable = {
+    then(resolve, reject) {
+      is(resolve(3), undefined, "Thenable resolve argument should return undefined");
+      is(reject(4), undefined, "Thenable reject argument should return undefined");
+      SimpleTest.finish();
+    },
+  };
+
+  SimpleTest.waitForExplicitFinish();
+  p = Promise.resolve(thenable);
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1120235">Mozilla Bug 1120235</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/dom/promise/tests/test_species_getter.html b/dom/promise/tests/test_species_getter.html
new file mode 100644
index 0000000000..23cb7d8ae0
--- /dev/null
+++ b/dom/promise/tests/test_species_getter.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for ...</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+  /* global test, assert_not_equals, assert_equals */
+
+  var desc = Object.getOwnPropertyDescriptor(Promise, Symbol.species);
+  assert_not_equals(desc, undefined, "Should have a property");
+
+  assert_equals(desc.configurable, true, "Property should be configurable");
+  assert_equals(desc.enumerable, false, "Property should not be enumerable");
+  assert_equals(desc.set, undefined, "Should not have a setter");
+  var getter = desc.get;
+
+  var things = [undefined, null, 5, "xyz", Promise, Object];
+  for (var thing of things) {
+    assert_equals(getter.call(thing), thing,
+                  "Getter should return its this value");
+  }
+}, "Promise should have an @@species getter that works per spec");
+</script>
diff --git a/dom/promise/tests/test_thenable_vs_promise_ordering.html b/dom/promise/tests/test_thenable_vs_promise_ordering.html
new file mode 100644
index 0000000000..a537490b16
--- /dev/null
+++ b/dom/promise/tests/test_thenable_vs_promise_ordering.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for promise resolution ordering with thenables and promises</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+/* global async_test, assert_true, assert_equals */
+
+var t = async_test("A promise resolved first (with a thenable) should trigger its callbacks before a promise resolved second (with a promise).");
+t.step(function() {
+  var customThenCalled = false;
+  var p0 = Promise.resolve();
+  p0.then = function(resolved, rejected) {
+    customThenCalled = true;
+    Promise.prototype.then.call(this, resolved, rejected);
+  };
+  var p1 = new Promise(function(r) { r(p0); });
+  delete p0.then;
+  var p2 = new Promise(function(r) { r(p0); });
+  var resolutionOrder = "";
+  Promise.all([ p1.then(function() { resolutionOrder += "1"; }),
+                p2.then(function() { resolutionOrder += "2"; }) ])
+         .then(t.step_func_done(function() {
+           assert_true(customThenCalled, "Should have called custom then");
+           assert_equals(resolutionOrder, "12");
+         }));
+});
+</script>
diff --git a/dom/promise/tests/test_webassembly_compile.html b/dom/promise/tests/test_webassembly_compile.html
new file mode 100644
index 0000000000..351f0f4ae4
--- /dev/null
+++ b/dom/promise/tests/test_webassembly_compile.html
@@ -0,0 +1,446 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html>
+<head>
+  <title>WebAssembly.compile Test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<script>
+const testingFunctions = SpecialPowers.Cu.getJSTestingFunctions();
+const wasmIsSupported = SpecialPowers.unwrap(testingFunctions.wasmIsSupported);
+const wasmHasTier2CompilationCompleted = SpecialPowers.unwrap(testingFunctions.wasmHasTier2CompilationCompleted);
+const wasmLoadedFromCache = SpecialPowers.unwrap(testingFunctions.wasmLoadedFromCache);
+const isCachingEnabled = SpecialPowers.getBoolPref("javascript.options.wasm_caching");
+
+// The test_webassembly_compile_sample.wasm is a medium-sized module with 100
+// functions that call each other recursively, returning a computed sum.
+// Any other non-trivial module could be generated and used.
+var sampleCode;
+const sampleURL = "test_webassembly_compile_sample.wasm";
+const sampleFileSize = 16053;
+const sampleURLWithRandomQuery = () => sampleURL + "?id=" + String(Math.ceil(Math.random()*100000));
+const sampleExportName = "run";
+const sampleResult = 1275;
+
+function checkSampleModule(m) {
+  ok(m instanceof WebAssembly.Module, "got a module");
+  var i = new WebAssembly.Instance(m);
+  ok(i instanceof WebAssembly.Instance, "got an instance");
+  ok(i.exports[sampleExportName]() === sampleResult, "got result");
+}
+
+function checkSampleInstance(i) {
+  ok(i instanceof WebAssembly.Instance, "got a module");
+  ok(i.exports[sampleExportName]() === sampleResult, "got result");
+}
+
+function fetchSampleModuleCode() {
+  fetch(sampleURL)
+  .then(response => response.arrayBuffer())
+  .then(buffer => { sampleCode = buffer; runTest(); })
+  .catch(err => ok(false, String(err)));
+}
+
+function propertiesExist() {
+  if (!wasmIsSupported()) {
+    ok(!this.WebAssembly, "If the device doesn't support, there will be no WebAssembly object");
+    SimpleTest.finish();
+    return;
+  }
+
+  ok(WebAssembly, "WebAssembly object should exist");
+  ok(WebAssembly.compile, "WebAssembly.compile function should exist");
+  runTest();
+}
+
+function compileFail() {
+  WebAssembly.compile().then(
+    () => { ok(false, "should have failed"); runTest(); }
+  ).catch(
+    err => { ok(err instanceof TypeError, "empty compile failed"); runTest(); }
+  );
+}
+
+function compileSuccess() {
+  WebAssembly.compile(sampleCode).then(
+    m => { checkSampleModule(m); runTest(); }
+  ).catch(
+    err => { ok(false, String(err)); runTest(); }
+  );
+}
+
+function compileManySuccess() {
+  const N = 100;
+
+  var arr = [];
+  for (var i = 0; i < N; i++)
+    arr.push(WebAssembly.compile(sampleCode));
+
+  SpecialPowers.gc();
+
+  Promise.all(arr).then(ms => {
+    ok(ms.length === N, "got the right number");
+    for (var j = 0; j < N; j++)
+      checkSampleModule(ms[j]);
+    runTest();
+  }).catch(
+    err => { ok(false, String(err)); runTest(); }
+  );
+}
+
+function terminateCompileInWorker() {
+    var w = new Worker(`data:text/plain,
+      var sampleCode;
+      function spawnWork() {
+        const N = 100;
+        var arr = [];
+        for (var i = 0; i < N; i++)
+          arr.push(WebAssembly.compile(sampleCode));
+        Promise.all(arr).then(spawnWork);
+      }
+      onmessage = e => {
+        sampleCode = e.data;
+        spawnWork();
+        postMessage("ok");
+      }
+    `);
+    w.postMessage(sampleCode);
+    w.onmessage = e => {
+      ok(e.data === "ok", "worker finished first step");
+      w.terminate();
+      runTest();
+    };
+}
+
+function instantiateFail() {
+  WebAssembly.instantiate().then(
+    () => { ok(false, "should have failed"); runTest(); }
+  ).catch(
+    err => { ok(err instanceof TypeError, "empty compile failed"); runTest(); }
+  );
+}
+
+function instantiateSuccess() {
+  WebAssembly.instantiate(sampleCode).then(
+    r => { checkSampleModule(r.module); checkSampleInstance(r.instance); runTest(); }
+  ).catch(
+    err => { ok(false, String(err)); runTest(); }
+  );
+}
+
+function chainSuccess() {
+  WebAssembly.compile(sampleCode).then(
+    m => WebAssembly.instantiate(m)
+  ).then(
+    i => { checkSampleInstance(i); runTest(); }
+  ).catch(
+    err => { ok(false, String(err)); runTest(); }
+  );
+}
+
+function compileStreamingNonResponse() {
+  WebAssembly.compileStreaming({})
+  .then(() => { ok(false); })
+  .catch(err => { ok(err instanceof TypeError, "rejected {}"); runTest(); });
+}
+
+function compileStreamingNoMime() {
+  WebAssembly.compileStreaming(new Response(new ArrayBuffer()))
+  .then(() => { ok(false); })
+  .catch(err => { ok(err instanceof TypeError, "rejected no MIME type"); runTest(); });
+}
+
+function compileStreamingBadMime() {
+  var badMimes = [
+    "",
+    "application/js",
+    "application/js;application/wasm",
+    "application/wasm;application/js",
+    "application/wasm;",
+    "application/wasm1",
+  ];
+  var promises = [];
+  for (let mimeType of badMimes) {
+    var init = { headers: { "Content-Type": mimeType } };
+    promises.push(
+      WebAssembly.compileStreaming(new Response(sampleCode, init))
+      .then(() => Promise.reject(), err => {
+        is(err.message,
+          `WebAssembly: Response has unsupported MIME type '${mimeType}' expected 'application/wasm'`,
+          "correct MIME type error message");
+        return Promise.resolve();
+      })
+    );
+  }
+  Promise.all(promises)
+  .then(() => { ok(true, "all bad MIME types rejected"); runTest(); });
+}
+
+function compileStreamingGoodMime() {
+  var badMimes = [
+    "application/wasm",
+    "   application/wasm ",
+    "application/wasm   ",
+  ];
+  var promises = [];
+  for (let mimeType of badMimes) {
+    var init = { headers: { "Content-Type": mimeType } };
+    promises.push(
+      WebAssembly.compileStreaming(new Response(sampleCode, init))
+    );
+  }
+  Promise.all(promises)
+  .then(() => { ok(true, "all good MIME types accepted"); runTest(); });
+}
+
+function compileStreamingDoubleUseFail() {
+  fetch(sampleURL)
+  .then(response => {
+      WebAssembly.compileStreaming(response)
+      .then(m => {
+        checkSampleModule(m);
+        return WebAssembly.compileStreaming(response);
+      })
+      .then(
+        () => ok(false, "should have failed on second use"),
+        err => { ok(true, "failed on second use"); runTest(); }
+      );
+  });
+}
+
+function compileStreamingNullBody() {
+  var init = { headers: { "Content-Type": "application/wasm" } };
+  WebAssembly.compileStreaming(new Response(undefined, init))
+  .then(() => { ok(false); })
+  .catch(err => { ok(err instanceof WebAssembly.CompileError, "null body"); runTest(); });
+}
+
+function compileStreamingFetch() {
+  WebAssembly.compileStreaming(fetch(sampleURL))
+  .then(m => { checkSampleModule(m); runTest(); })
+  .catch(err => { ok(false, String(err)); });
+}
+
+function compileCachedBasic() {
+  const url = sampleURLWithRandomQuery();
+  WebAssembly.compileStreaming(fetch(url))
+  .then(module => {
+    checkSampleModule(module);
+    ok(!wasmLoadedFromCache(module), "not cached yet");
+    while(!wasmHasTier2CompilationCompleted(module));
+    return WebAssembly.compileStreaming(fetch(url));
+  })
+  .then(module => {
+    checkSampleModule(module);
+    ok(wasmLoadedFromCache(module), "loaded from cache");
+  })
+  .then(() => runTest())
+  .catch(err => { ok(false, String(err)) });
+}
+
+function compileCachedCompressed() {
+  const url = sampleURLWithRandomQuery();
+
+  // It is a rough estimate that compilation code is about
+  // 2-4 times of the wasm file size. After it compression
+  // it will be less (about 60% ?)
+  const EstimatedCompilationArtifactSize = 2 * sampleFileSize;
+  const EstimatedCompressedArtifactSize = 0.6 * EstimatedCompilationArtifactSize;
+
+  // Set limit on cache entry so it will fail if it is not
+  // compressed.
+  const cleanup = () => {
+    SpecialPowers.clearUserPref("browser.cache.disk.max_entry_size")
+  };
+  Promise.resolve(SpecialPowers.setIntPref("browser.cache.disk.max_entry_size",
+    Math.round(EstimatedCompressedArtifactSize / 1024) /* kb */))
+  .then(() => WebAssembly.compileStreaming(fetch(url)))
+  .then(module => {
+    checkSampleModule(module);
+    ok(!wasmLoadedFromCache(module), "not cached yet");
+    while(!wasmHasTier2CompilationCompleted(module));
+    return WebAssembly.compileStreaming(fetch(url));
+  })
+  .then(module => {
+    checkSampleModule(module);
+    ok(wasmLoadedFromCache(module), "loaded from cache");
+  })
+  .then(() => { cleanup(); runTest() })
+  .catch(err => { cleanup(); ok(false, String(err)) });
+}
+
+function compileCachedTooLargeForCache() {
+  const url = sampleURLWithRandomQuery();
+  // Set unreasonable limit, caching will fail.
+  // Bug 1719508 can change name of pref, this and
+  // compileCachedCompressed tests will become invalid.
+  const cleanup = () => {
+    SpecialPowers.clearUserPref("browser.cache.disk.max_entry_size")
+  };
+  Promise.resolve(SpecialPowers.setIntPref("browser.cache.disk.max_entry_size", 1 /* kb */))
+  .then(() => WebAssembly.compileStreaming(fetch(url)))
+  .then(module => {
+    console.log(module)
+    checkSampleModule(module);
+    ok(!wasmLoadedFromCache(module), "not cached yet");
+    while(!wasmHasTier2CompilationCompleted(module));
+    return WebAssembly.compileStreaming(fetch(url));
+  })
+  .then(module => {
+    checkSampleModule(module);
+    ok(!wasmLoadedFromCache(module), "not cached (size limit)");
+  })
+  .then(() => { cleanup(); runTest() })
+  .catch(err => { cleanup(); ok(false, String(err)) });
+}
+
+const Original = "original";
+const Clone = "clone";
+
+function compileCachedBothClonesHitCache(which) {
+  const url = sampleURLWithRandomQuery();
+  WebAssembly.compileStreaming(fetch(url))
+  .then(module => {
+    checkSampleModule(module);
+    ok(!wasmLoadedFromCache(module), "not cached yet");
+    while(!wasmHasTier2CompilationCompleted(module));
+    return fetch(url);
+  })
+  .then(original => {
+    let clone = original.clone();
+    if (which === Clone) [clone, original] = [original, clone];
+    return Promise.all([
+      WebAssembly.compileStreaming(original),
+      WebAssembly.compileStreaming(clone)
+    ]);
+  })
+  .then(([m1, m2]) => {
+    checkSampleModule(m1);
+    ok(wasmLoadedFromCache(m1), "clone loaded from cache");
+    checkSampleModule(m2);
+    ok(wasmLoadedFromCache(m2), "original loaded from cache");
+  })
+  .then(() => runTest())
+  .catch(err => { ok(false, String(err)) });
+}
+
+function compileCachedCacheThroughClone(which) {
+  const url = sampleURLWithRandomQuery();
+  fetch(url)
+  .then(original => {
+    ok(true, "fun time");
+    let clone = original.clone();
+    if (which === Clone) [clone, original] = [original, clone];
+    return Promise.all([
+      WebAssembly.compileStreaming(original),
+      clone.arrayBuffer()
+    ]);
+  })
+  .then(([module, buffer]) => {
+    ok(!wasmLoadedFromCache(module), "not cached yet");
+    ok(buffer instanceof ArrayBuffer);
+    while(!wasmHasTier2CompilationCompleted(module));
+    return WebAssembly.compileStreaming(fetch(url));
+  })
+  .then(m => {
+    ok(wasmLoadedFromCache(m), "cache hit of " + which);
+  })
+  .then(() => runTest())
+  .catch(err => { ok(false, String(err)) });
+}
+
+function instantiateStreamingFetch() {
+  WebAssembly.instantiateStreaming(fetch(sampleURL))
+  .then(({module, instance}) => { checkSampleModule(module); checkSampleInstance(instance); runTest(); })
+  .catch(err => { ok(false, String(err)); });
+}
+
+function compileManyStreamingFetch() {
+  const N = 20;
+
+  var arr = [];
+  for (var i = 0; i < N; i++)
+    arr.push(WebAssembly.compileStreaming(fetch(sampleURL)));
+
+  SpecialPowers.gc();
+
+  Promise.all(arr).then(ms => {
+    ok(ms.length === N, "got the right number");
+    for (var j = 0; j < N; j++)
+      checkSampleModule(ms[j]);
+    runTest();
+  }).catch(
+    err => { ok(false, String(err)); runTest(); }
+  );
+}
+
+function runWorkerTests() {
+  var w = new Worker("test_webassembly_compile_worker.js");
+  w.postMessage(sampleCode);
+  w.onmessage = e => {
+    ok(e.data === "ok", "worker test: " + e.data);
+    runTest();
+  };
+}
+
+function terminateCompileStreamingInWorker() {
+  var w = new Worker("test_webassembly_compile_worker_terminate.js");
+  w.onmessage = e => {
+    ok(e.data === "ok", "worker streaming terminate test: " + e.data);
+    w.terminate();
+    runTest();
+  };
+}
+
+var tests = [ propertiesExist,
+              compileFail,
+              compileSuccess,
+              compileManySuccess,
+              terminateCompileInWorker,
+              instantiateFail,
+              instantiateSuccess,
+              chainSuccess,
+              compileStreamingNonResponse,
+              compileStreamingNoMime,
+              compileStreamingBadMime,
+              compileStreamingGoodMime,
+              compileStreamingDoubleUseFail,
+              compileStreamingNullBody,
+              compileStreamingFetch,
+              ...(isCachingEnabled ? [
+                compileCachedBasic,
+                compileCachedCompressed,
+                compileCachedTooLargeForCache,
+                compileCachedBothClonesHitCache.bind(Original),
+                compileCachedBothClonesHitCache.bind(Clone),
+                compileCachedCacheThroughClone.bind(Original),
+                compileCachedCacheThroughClone.bind(Clone),
+              ]: []),
+              instantiateStreamingFetch,
+              compileManyStreamingFetch,
+              runWorkerTests,
+              terminateCompileStreamingInWorker,
+            ];
+
+// This initialization must always run
+tests.unshift(fetchSampleModuleCode);
+
+function runTest() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+</script>
+</body>
+</html>
diff --git a/dom/promise/tests/test_webassembly_compile_sample.wasm b/dom/promise/tests/test_webassembly_compile_sample.wasm
new file mode 100644
index 0000000000..787e19a5df
--- /dev/null
+++ b/dom/promise/tests/test_webassembly_compile_sample.wasm
diff --git a/dom/promise/tests/test_webassembly_compile_worker.js b/dom/promise/tests/test_webassembly_compile_worker.js
new file mode 100644
index 0000000000..90c3551137
--- /dev/null
+++ b/dom/promise/tests/test_webassembly_compile_worker.js
@@ -0,0 +1,55 @@
+const sampleURL = "test_webassembly_compile_sample.wasm";
+const sampleExportName = "run";
+const sampleResult = 1275;
+
+/* eslint-disable no-throw-literal */
+
+function checkSampleModule(m) {
+  if (!(m instanceof WebAssembly.Module)) {
+    throw "not a module";
+  }
+  var i = new WebAssembly.Instance(m);
+  if (!(i instanceof WebAssembly.Instance)) {
+    throw "not an instance";
+  }
+  if (i.exports[sampleExportName]() !== sampleResult) {
+    throw "wrong result";
+  }
+}
+
+function checkSampleInstance(i) {
+  if (!(i instanceof WebAssembly.Instance)) {
+    throw "not an instance";
+  }
+  if (i.exports[sampleExportName]() !== sampleResult) {
+    throw "wrong result";
+  }
+}
+
+const initObj = { headers: { "Content-Type": "application/wasm" } };
+
+onmessage = e => {
+  WebAssembly.compile(e.data)
+    .then(m => checkSampleModule(m))
+    .then(() => WebAssembly.instantiate(e.data))
+    .then(({ module, instance }) => {
+      checkSampleModule(module);
+      checkSampleInstance(instance);
+    })
+    .then(() => WebAssembly.compileStreaming(new Response(e.data, initObj)))
+    .then(m => checkSampleModule(m))
+    .then(() => WebAssembly.instantiateStreaming(new Response(e.data, initObj)))
+    .then(({ module, instance }) => {
+      checkSampleModule(module);
+      checkSampleInstance(instance);
+    })
+    .then(() => WebAssembly.compileStreaming(fetch(sampleURL)))
+    .then(m => checkSampleModule(m))
+    .then(() => WebAssembly.instantiateStreaming(fetch(sampleURL)))
+    .then(({ module, instance }) => {
+      checkSampleModule(module);
+      checkSampleInstance(instance);
+    })
+    .then(() => postMessage("ok"))
+    .catch(err => postMessage("fail: " + err));
+};
diff --git a/dom/promise/tests/test_webassembly_compile_worker_terminate.js b/dom/promise/tests/test_webassembly_compile_worker_terminate.js
new file mode 100644
index 0000000000..5b96c9034b
--- /dev/null
+++ b/dom/promise/tests/test_webassembly_compile_worker_terminate.js
@@ -0,0 +1,13 @@
+const sampleURL = "test_webassembly_compile_sample.wasm";
+
+function spawnWork() {
+  const N = 50;
+  var arr = [];
+  for (var i = 0; i < N; i++) {
+    arr.push(WebAssembly.compileStreaming(fetch(sampleURL)));
+  }
+  Promise.all(arr).then(spawnWork);
+}
+
+spawnWork();
+postMessage("ok");
diff --git a/dom/promise/tests/unit/test_monitor_uncaught.js b/dom/promise/tests/unit/test_monitor_uncaught.js
new file mode 100644
index 0000000000..afa328cb97
--- /dev/null
+++ b/dom/promise/tests/unit/test_monitor_uncaught.js
@@ -0,0 +1,322 @@
+/* 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";
+
+const { setTimeout } = ChromeUtils.importESModule(
+  "resource://gre/modules/Timer.sys.mjs"
+);
+const { PromiseTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromiseTestUtils.sys.mjs"
+);
+
+// Prevent test failures due to the unhandled rejections in this test file.
+PromiseTestUtils.disableUncaughtRejectionObserverForSelfTest();
+
+add_task(async function test_globals() {
+  Assert.notEqual(
+    PromiseDebugging,
+    undefined,
+    "PromiseDebugging is available."
+  );
+});
+
+add_task(async function test_promiseID() {
+  let p1 = new Promise(resolve => {});
+  let p2 = new Promise(resolve => {});
+  let p3 = p2.catch(null);
+  let promise = [p1, p2, p3];
+
+  let identifiers = promise.map(PromiseDebugging.getPromiseID);
+  info("Identifiers: " + JSON.stringify(identifiers));
+  let idSet = new Set(identifiers);
+  Assert.equal(
+    idSet.size,
+    identifiers.length,
+    "PromiseDebugging.getPromiseID returns a distinct id per promise"
+  );
+
+  let identifiers2 = promise.map(PromiseDebugging.getPromiseID);
+  Assert.equal(
+    JSON.stringify(identifiers),
+    JSON.stringify(identifiers2),
+    "Successive calls to PromiseDebugging.getPromiseID return the same id for the same promise"
+  );
+});
+
+add_task(async function test_observe_uncaught() {
+  // The names of Promise instances
+  let names = new Map();
+
+  // The results for UncaughtPromiseObserver callbacks.
+  let CallbackResults = function (name) {
+    this.name = name;
+    this.expected = new Set();
+    this.observed = new Set();
+    this.blocker = new Promise(resolve => (this.resolve = resolve));
+  };
+  CallbackResults.prototype = {
+    observe(promise) {
+      info(this.name + " observing Promise " + names.get(promise));
+      Assert.equal(
+        PromiseDebugging.getState(promise).state,
+        "rejected",
+        this.name + " observed a rejected Promise"
+      );
+      if (!this.expected.has(promise)) {
+        Assert.ok(
+          false,
+          this.name +
+            " observed a Promise that it expected to observe, " +
+            names.get(promise) +
+            " (" +
+            PromiseDebugging.getPromiseID(promise) +
+            ", " +
+            PromiseDebugging.getAllocationStack(promise) +
+            ")"
+        );
+      }
+      Assert.ok(
+        this.expected.delete(promise),
+        this.name +
+          " observed a Promise that it expected to observe, " +
+          names.get(promise) +
+          " (" +
+          PromiseDebugging.getPromiseID(promise) +
+          ")"
+      );
+      Assert.ok(
+        !this.observed.has(promise),
+        this.name + " observed a Promise that it has not observed yet"
+      );
+      this.observed.add(promise);
+      if (this.expected.size == 0) {
+        this.resolve();
+      } else {
+        info(
+          this.name +
+            " is still waiting for " +
+            this.expected.size +
+            " observations:"
+        );
+        info(
+          JSON.stringify(Array.from(this.expected.values(), x => names.get(x)))
+        );
+      }
+    },
+  };
+
+  let onLeftUncaught = new CallbackResults("onLeftUncaught");
+  let onConsumed = new CallbackResults("onConsumed");
+
+  let observer = {
+    onLeftUncaught(promise, data) {
+      onLeftUncaught.observe(promise);
+    },
+    onConsumed(promise) {
+      onConsumed.observe(promise);
+    },
+  };
+
+  let resolveLater = function (delay = 20) {
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    return new Promise((resolve, reject) => setTimeout(resolve, delay));
+  };
+  let rejectLater = function (delay = 20) {
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    return new Promise((resolve, reject) => setTimeout(reject, delay));
+  };
+  let makeSamples = function* () {
+    yield {
+      promise: Promise.resolve(0),
+      name: "Promise.resolve",
+    };
+    yield {
+      promise: Promise.resolve(resolve => resolve(0)),
+      name: "Resolution callback",
+    };
+    yield {
+      promise: Promise.resolve(0).catch(null),
+      name: "`catch(null)`",
+    };
+    yield {
+      promise: Promise.reject(0).catch(() => {}),
+      name: "Reject and catch immediately",
+    };
+    yield {
+      promise: resolveLater(),
+      name: "Resolve later",
+    };
+    yield {
+      promise: Promise.reject("Simple rejection"),
+      leftUncaught: true,
+      consumed: false,
+      name: "Promise.reject",
+    };
+
+    // Reject a promise now, consume it later.
+    let p = Promise.reject("Reject now, consume later");
+
+    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+    setTimeout(
+      () =>
+        p.catch(() => {
+          info("Consumed promise");
+        }),
+      200
+    );
+    yield {
+      promise: p,
+      leftUncaught: true,
+      consumed: true,
+      name: "Reject now, consume later",
+    };
+
+    yield {
+      promise: Promise.all([Promise.resolve("Promise.all"), rejectLater()]),
+      leftUncaught: true,
+      name: "Rejecting through Promise.all",
+    };
+    yield {
+      promise: Promise.race([resolveLater(500), Promise.reject()]),
+      leftUncaught: true, // The rejection wins the race.
+      name: "Rejecting through Promise.race",
+    };
+    yield {
+      promise: Promise.race([Promise.resolve(), rejectLater(500)]),
+      leftUncaught: false, // The resolution wins the race.
+      name: "Resolving through Promise.race",
+    };
+
+    let boom = new Error("`throw` in the constructor");
+    yield {
+      promise: new Promise(() => {
+        throw boom;
+      }),
+      leftUncaught: true,
+      name: "Throwing in the constructor",
+    };
+
+    let rejection = Promise.reject("`reject` during resolution");
+    yield {
+      promise: rejection,
+      leftUncaught: false,
+      consumed: false, // `rejection` is consumed immediately (see below)
+      name: "Promise.reject, again",
+    };
+
+    yield {
+      promise: new Promise(resolve => resolve(rejection)),
+      leftUncaught: true,
+      consumed: false,
+      name: "Resolving with a rejected promise",
+    };
+
+    yield {
+      promise: Promise.resolve(0).then(() => rejection),
+      leftUncaught: true,
+      consumed: false,
+      name: "Returning a rejected promise from success handler",
+    };
+
+    yield {
+      promise: Promise.resolve(0).then(() => {
+        throw new Error();
+      }),
+      leftUncaught: true,
+      consumed: false,
+      name: "Throwing during the call to the success callback",
+    };
+  };
+  let samples = [];
+  for (let s of makeSamples()) {
+    samples.push(s);
+    info(
+      "Promise '" +
+        s.name +
+        "' has id " +
+        PromiseDebugging.getPromiseID(s.promise)
+    );
+  }
+
+  PromiseDebugging.addUncaughtRejectionObserver(observer);
+
+  for (let s of samples) {
+    names.set(s.promise, s.name);
+    if (s.leftUncaught || false) {
+      onLeftUncaught.expected.add(s.promise);
+    }
+    if (s.consumed || false) {
+      onConsumed.expected.add(s.promise);
+    }
+  }
+
+  info("Test setup, waiting for callbacks.");
+  await onLeftUncaught.blocker;
+
+  info("All calls to onLeftUncaught are complete.");
+  if (onConsumed.expected.size != 0) {
+    info("onConsumed is still waiting for the following Promise:");
+    info(
+      JSON.stringify(
+        Array.from(onConsumed.expected.values(), x => names.get(x))
+      )
+    );
+    await onConsumed.blocker;
+  }
+
+  info("All calls to onConsumed are complete.");
+  let removed = PromiseDebugging.removeUncaughtRejectionObserver(observer);
+  Assert.ok(removed, "removeUncaughtRejectionObserver succeeded");
+  removed = PromiseDebugging.removeUncaughtRejectionObserver(observer);
+  Assert.ok(
+    !removed,
+    "second call to removeUncaughtRejectionObserver didn't remove anything"
+  );
+});
+
+add_task(async function test_uninstall_observer() {
+  let Observer = function () {
+    this.blocker = new Promise(resolve => (this.resolve = resolve));
+    this.active = true;
+  };
+  Observer.prototype = {
+    set active(x) {
+      this._active = x;
+      if (x) {
+        PromiseDebugging.addUncaughtRejectionObserver(this);
+      } else {
+        PromiseDebugging.removeUncaughtRejectionObserver(this);
+      }
+    },
+    onLeftUncaught() {
+      Assert.ok(this._active, "This observer is active.");
+      this.resolve();
+    },
+    onConsumed() {
+      Assert.ok(false, "We should not consume any Promise.");
+    },
+  };
+
+  info("Adding an observer.");
+  let deactivate = new Observer();
+  Promise.reject("I am an uncaught rejection.");
+  await deactivate.blocker;
+  Assert.ok(true, "The observer has observed an uncaught Promise.");
+  deactivate.active = false;
+  info(
+    "Removing the observer, it should not observe any further uncaught Promise."
+  );
+
+  info(
+    "Rejecting a Promise and waiting a little to give a chance to observers."
+  );
+  let wait = new Observer();
+  Promise.reject("I am another uncaught rejection.");
+  await wait.blocker;
+  // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
+  await new Promise(resolve => setTimeout(resolve, 100));
+  // Normally, `deactivate` should not be notified of the uncaught rejection.
+  wait.active = false;
+});
diff --git a/dom/promise/tests/unit/test_promise_job_across_sandbox.js b/dom/promise/tests/unit/test_promise_job_across_sandbox.js
new file mode 100644
index 0000000000..ff1d1575e3
--- /dev/null
+++ b/dom/promise/tests/unit/test_promise_job_across_sandbox.js
@@ -0,0 +1,221 @@
+function createSandbox() {
+  const uri = Services.io.newURI("https://example.com");
+  const principal = Services.scriptSecurityManager.createContentPrincipal(
+    uri,
+    {}
+  );
+  return new Cu.Sandbox(principal, {});
+}
+
+add_task(async function testReactionJob() {
+  const sandbox = createSandbox();
+
+  sandbox.eval(`
+var testPromise = Promise.resolve(10);
+`);
+
+  // Calling `Promise.prototype.then` from sandbox performs GetFunctionRealm
+  // on wrapped `resolve` in sandbox realm, and it fails to unwrap the security
+  // wrapper. The reaction job should be created with sandbox realm.
+  const p = new Promise(resolve => {
+    sandbox.resolve = resolve;
+
+    sandbox.eval(`
+testPromise.then(resolve);
+`);
+  });
+
+  const result = await p;
+
+  equal(result, 10);
+});
+
+add_task(async function testReactionJobNuked() {
+  const sandbox = createSandbox();
+
+  sandbox.eval(`
+var testPromise = Promise.resolve(10);
+`);
+
+  // Calling `Promise.prototype.then` from sandbox performs GetFunctionRealm
+  // on wrapped `resolve` in sandbox realm, and it fails to unwrap the security
+  // wrapper. The reaction job should be created with sandbox realm.
+  const p1 = new Promise(resolve => {
+    sandbox.resolve = resolve;
+
+    sandbox.eval(`
+testPromise.then(resolve);
+`);
+
+    // Given the reaction job is created with the sandbox realm, nuking the
+    // sandbox prevents the job gets executed.
+    Cu.nukeSandbox(sandbox);
+  });
+
+  const p2 = Promise.resolve(11);
+
+  // Given the p1 doesn't get resolved, p2 should win.
+  const result = await Promise.race([p1, p2]);
+
+  equal(result, 11);
+});
+
+add_task(async function testReactionJobWithXray() {
+  const sandbox = createSandbox();
+
+  sandbox.eval(`
+var testPromise = Promise.resolve(10);
+`);
+
+  // Calling `Promise.prototype.then` from privileged realm via Xray uses
+  // privileged `Promise.prototype.then` function, and GetFunctionRealm
+  // performed there successfully gets top-level realm. The reaction job
+  // should be created with top-level realm.
+  const result = await new Promise(resolve => {
+    sandbox.testPromise.then(resolve);
+
+    // Given the reaction job is created with the top-level realm, nuking the
+    // sandbox doesn't affect the reaction job.
+    Cu.nukeSandbox(sandbox);
+  });
+
+  equal(result, 10);
+});
+
+add_task(async function testBoundReactionJob() {
+  const sandbox = createSandbox();
+
+  sandbox.eval(`
+var resolve = undefined;
+var callbackPromise = new Promise(r => { resolve = r; });
+var callback = function (v) { resolve(v + 1); };
+`);
+
+  // Create a bound function where its realm is privileged realm, and
+  // its target is from sandbox realm.
+  sandbox.bound_callback = Function.prototype.bind.call(
+    sandbox.callback,
+    sandbox
+  );
+
+  // Calling `Promise.prototype.then` from sandbox performs GetFunctionRealm
+  // and it fails. The reaction job should be created with sandbox realm.
+  sandbox.eval(`
+Promise.resolve(10).then(bound_callback);
+`);
+
+  const result = await sandbox.callbackPromise;
+  equal(result, 11);
+});
+
+add_task(async function testThenableJob() {
+  const sandbox = createSandbox();
+
+  const p = new Promise(resolve => {
+    // Create a bound function where its realm is privileged realm, and
+    // its target is from sandbox realm.
+    sandbox.then = function (onFulfilled, onRejected) {
+      resolve(10);
+    };
+  });
+
+  // Creating a promise thenable job in the following `Promise.resolve` performs
+  // GetFunctionRealm on the bound thenable.then and fails. The reaction job
+  // should be created with sandbox realm.
+  sandbox.eval(`
+var thenable = {
+  then: then,
+};
+
+Promise.resolve(thenable);
+`);
+
+  const result = await p;
+  equal(result, 10);
+});
+
+add_task(async function testThenableJobNuked() {
+  const sandbox = createSandbox();
+
+  let called = false;
+  sandbox.then = function (onFulfilled, onRejected) {
+    called = true;
+  };
+
+  // Creating a promise thenable job in the following `Promise.resolve` performs
+  // GetFunctionRealm on the bound thenable.then and fails. The reaction job
+  // should be created with sandbox realm.
+  sandbox.eval(`
+var thenable = {
+  then: then,
+};
+
+Promise.resolve(thenable);
+`);
+
+  Cu.nukeSandbox(sandbox);
+
+  // Drain the job queue, to make sure we hit dead object error inside the
+  // thenable job.
+  await Promise.resolve(10);
+
+  equal(
+    Services.console.getMessageArray().find(x => {
+      return x.toString().includes("can't access dead object");
+    }) !== undefined,
+    true
+  );
+  equal(called, false);
+});
+
+add_task(async function testThenableJobAccessError() {
+  const sandbox = createSandbox();
+
+  let accessed = false;
+  sandbox.thenable = {
+    get then() {
+      accessed = true;
+    },
+  };
+
+  // The following operation silently fails when accessing `then` property.
+  sandbox.eval(`
+var x = typeof thenable.then;
+
+Promise.resolve(thenable);
+`);
+
+  equal(accessed, false);
+});
+
+add_task(async function testBoundThenableJob() {
+  const sandbox = createSandbox();
+
+  sandbox.eval(`
+var resolve = undefined;
+var callbackPromise = new Promise(r => { resolve = r; });
+var callback = function (v) { resolve(v + 1); };
+
+var then = function(onFulfilled, onRejected) {
+  onFulfilled(10);
+};
+`);
+
+  // Create a bound function where its realm is privileged realm, and
+  // its target is from sandbox realm.
+  sandbox.bound_then = Function.prototype.bind.call(sandbox.then, sandbox);
+
+  // Creating a promise thenable job in the following `Promise.resolve` performs
+  // GetFunctionRealm on the bound thenable.then and fails. The reaction job
+  // should be created with sandbox realm.
+  sandbox.eval(`
+var thenable = {
+  then: bound_then,
+};
+
+Promise.resolve(thenable).then(callback);
+`);
+
+  const result = await sandbox.callbackPromise;
+  equal(result, 11);
+});
diff --git a/dom/promise/tests/unit/test_promise_unhandled_rejection.js b/dom/promise/tests/unit/test_promise_unhandled_rejection.js
new file mode 100644
index 0000000000..68471569ec
--- /dev/null
+++ b/dom/promise/tests/unit/test_promise_unhandled_rejection.js
@@ -0,0 +1,139 @@
+"use strict";
+
+// Tests that unhandled promise rejections generate the appropriate
+// console messages.
+
+const { AddonTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/AddonTestUtils.sys.mjs"
+);
+const { PromiseTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromiseTestUtils.sys.mjs"
+);
+
+PromiseTestUtils.expectUncaughtRejection(/could not be cloned/);
+PromiseTestUtils.expectUncaughtRejection(/An exception was thrown/);
+PromiseTestUtils.expectUncaughtRejection(/Bleah/);
+
+const filename = "resource://foo/Bar.jsm";
+
+async function getSandboxMessages(sandbox, code) {
+  let { messages } = await AddonTestUtils.promiseConsoleOutput(async () => {
+    Cu.evalInSandbox(code, sandbox, null, filename, 1);
+
+    // We need two trips through the event loop for this error to be reported.
+    await new Promise(executeSoon);
+    await new Promise(executeSoon);
+  });
+
+  // xpcshell tests on OS-X sometimes include an extra warning, which we
+  // unfortunately need to ignore:
+  return messages.filter(
+    msg =>
+      !msg.message.includes(
+        "No chrome package registered for chrome://branding/locale/brand.properties"
+      )
+  );
+}
+
+add_task(async function test_unhandled_dom_exception() {
+  let sandbox = Cu.Sandbox(Services.scriptSecurityManager.getSystemPrincipal());
+  sandbox.StructuredCloneHolder = StructuredCloneHolder;
+
+  let messages = await getSandboxMessages(
+    sandbox,
+    `new Promise(() => {
+      new StructuredCloneHolder("", "", () => {});
+    });`
+  );
+
+  equal(messages.length, 1, "Got one console message");
+
+  let [msg] = messages;
+  ok(msg instanceof Ci.nsIScriptError, "Message is a script error");
+  equal(msg.sourceName, filename, "Got expected filename");
+  equal(msg.lineNumber, 2, "Got expected line number");
+  equal(
+    msg.errorMessage,
+    "DataCloneError: Function object could not be cloned.",
+    "Got expected error message"
+  );
+});
+
+add_task(async function test_unhandled_dom_exception_wrapped() {
+  let sandbox = Cu.Sandbox(
+    Services.scriptSecurityManager.createContentPrincipalFromOrigin(
+      "http://example.com/"
+    )
+  );
+  Cu.exportFunction(
+    function frick() {
+      throw new Components.Exception(
+        "Bleah.",
+        Cr.NS_ERROR_FAILURE,
+        Components.stack.caller
+      );
+    },
+    sandbox,
+    { defineAs: "frick" }
+  );
+
+  let messages = await getSandboxMessages(
+    sandbox,
+    `new Promise(() => {
+      frick();
+    });`
+  );
+
+  equal(messages.length, 2, "Got two console messages");
+
+  let [msg1, msg2] = messages;
+  ok(msg1 instanceof Ci.nsIScriptError, "Message is a script error");
+  equal(msg1.sourceName, filename, "Got expected filename");
+  equal(msg1.lineNumber, 2, "Got expected line number");
+  equal(
+    msg1.errorMessage,
+    "NS_ERROR_FAILURE: Bleah.",
+    "Got expected error message"
+  );
+
+  ok(msg2 instanceof Ci.nsIScriptError, "Message is a script error");
+  equal(msg2.sourceName, filename, "Got expected filename");
+  equal(msg2.lineNumber, 2, "Got expected line number");
+  equal(
+    msg2.errorMessage,
+    "InvalidStateError: An exception was thrown",
+    "Got expected error message"
+  );
+});
+
+add_task(async function test_unhandled_dom_exception_from_sandbox() {
+  let sandbox = Cu.Sandbox(
+    Services.scriptSecurityManager.createContentPrincipalFromOrigin(
+      "http://example.com/"
+    ),
+    { wantGlobalProperties: ["DOMException"] }
+  );
+  let ctor = Cu.evalInSandbox("DOMException", sandbox);
+  Cu.exportFunction(
+    function frick() {
+      throw new ctor("Bleah.");
+    },
+    sandbox,
+    { defineAs: "frick" }
+  );
+
+  let messages = await getSandboxMessages(
+    sandbox,
+    `new Promise(() => {
+      frick();
+    });`
+  );
+
+  equal(messages.length, 1, "Got one console messages");
+
+  let [msg] = messages;
+  ok(msg instanceof Ci.nsIScriptError, "Message is a script error");
+  equal(msg.sourceName, filename, "Got expected filename");
+  equal(msg.lineNumber, 2, "Got expected line number");
+  equal(msg.errorMessage, "Error: Bleah.", "Got expected error message");
+});
diff --git a/dom/promise/tests/unit/xpcshell.ini b/dom/promise/tests/unit/xpcshell.ini
new file mode 100644
index 0000000000..4da333a9b2
--- /dev/null
+++ b/dom/promise/tests/unit/xpcshell.ini
@@ -0,0 +1,6 @@
+[DEFAULT]
+head =
+
+[test_monitor_uncaught.js]
+[test_promise_unhandled_rejection.js]
+[test_promise_job_across_sandbox.js]