--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-highlight.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-highlight.js
@@ -9,17 +9,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_URL);
   let { window, $, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   is(CallsListView.itemCount, 8,
     "All the function calls should now be displayed in the UI.");
 
   is($(".call-item-view", CallsListView.getItemAtIndex(0).target).hasAttribute("draw-call"), true,
     "The first item's node should have a draw-call attribute.");
   is($(".call-item-view", CallsListView.getItemAtIndex(1).target).hasAttribute("draw-call"), false,
     "The second item's node should not have a draw-call attribute.");

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-list.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-list.js
@@ -10,17 +10,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_URL);
   let { window, $, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   is(CallsListView.itemCount, 8,
     "All the function calls should now be displayed in the UI.");
 
   testItem(CallsListView.getItemAtIndex(0),
     "1", "Object", "clearRect", "(0, 0, 128, 128)", "doc_simple-canvas.html:25");
 
   testItem(CallsListView.getItemAtIndex(1),

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-search.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-search.js
@@ -10,17 +10,17 @@ async function ifTestingSupported() {
   let { window, $, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
   let searchbox = $("#calls-searchbox");
 
   await reload(target);
 
   let firstRecordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([firstRecordingFinished, callListPopulated]);
+  await Promise.all([firstRecordingFinished, callListPopulated]);
 
   is(searchbox.value, "",
     "The searchbox should be initially empty.");
   is(CallsListView.visibleItems.length, 8,
     "All the items should be initially visible in the calls list.");
 
   searchbox.focus();
   EventUtils.sendString("clear", window);

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-01.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-01.js
@@ -15,17 +15,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_DEEP_STACK_URL);
   let { window, $, $all, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   let callItem = CallsListView.getItemAtIndex(2);
   let locationLink = $(".call-item-location", callItem.target);
 
   is($(".call-item-stack", callItem.target), null,
     "There should be no stack container available yet for the draw call.");
 
   let callStackDisplayed = once(window, EVENTS.CALL_STACK_DISPLAYED);

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-02.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-02.js
@@ -16,17 +16,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_DEEP_STACK_URL);
   let { window, $, $all, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   let callItem = CallsListView.getItemAtIndex(2);
   let locationLink = $(".call-item-location", callItem.target);
 
   is($(".call-item-stack", callItem.target), null,
     "There should be no stack container available yet for the draw call.");
 
   let callStackDisplayed = once(window, EVENTS.CALL_STACK_DISPLAYED);

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-03.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-call-stack-03.js
@@ -10,17 +10,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_DEEP_STACK_URL);
   let { window, $, $all, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   let callItem = CallsListView.getItemAtIndex(2);
   let view = $(".call-item-view", callItem.target);
   let contents = $(".call-item-contents", callItem.target);
 
   is(view.hasAttribute("call-stack-populated"), false,
     "The call item's view should not have the stack populated yet.");
   is(view.hasAttribute("call-stack-expanded"), false,

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-img-screenshots.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-img-screenshots.js
@@ -10,17 +10,17 @@ async function ifTestingSupported() {
   let { window, $, EVENTS, SnapshotsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   let screenshotDisplayed = once(window, EVENTS.CALL_SCREENSHOT_DISPLAYED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated, screenshotDisplayed]);
+  await Promise.all([recordingFinished, callListPopulated, screenshotDisplayed]);
 
   is($("#screenshot-container").hidden, false,
     "The screenshot container should now be visible.");
 
   is($("#screenshot-dimensions").getAttribute("value"), "128" + "\u00D7" + "128",
     "The screenshot dimensions label has the expected value.");
 
   is($("#screenshot-image").getAttribute("flipped"), "false",

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-img-thumbnails-01.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-img-thumbnails-01.js
@@ -10,17 +10,17 @@ async function ifTestingSupported() {
   let { window, $, $all, EVENTS, SnapshotsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   let thumbnailsDisplayed = once(window, EVENTS.THUMBNAILS_DISPLAYED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated, thumbnailsDisplayed]);
+  await Promise.all([recordingFinished, callListPopulated, thumbnailsDisplayed]);
 
   is($all(".filmstrip-thumbnail").length, 4,
     "There should be 4 thumbnails displayed in the UI.");
 
   let firstThumbnail = $(".filmstrip-thumbnail[index='0']");
   ok(firstThumbnail,
     "The first thumbnail element should be for the function call at index 0.");
   is(firstThumbnail.width, 50,

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-img-thumbnails-02.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-img-thumbnails-02.js
@@ -12,17 +12,17 @@ async function ifTestingSupported() {
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   let thumbnailsDisplayed = once(window, EVENTS.THUMBNAILS_DISPLAYED);
   let screenshotDisplayed = once(window, EVENTS.CALL_SCREENSHOT_DISPLAYED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([
+  await Promise.all([
     recordingFinished,
     callListPopulated,
     thumbnailsDisplayed,
     screenshotDisplayed
   ]);
 
   is($all(".filmstrip-thumbnail[highlighted]").length, 0,
     "There should be no highlighted thumbnail available yet.");

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-reload-02.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-reload-02.js
@@ -23,17 +23,17 @@ async function ifTestingSupported() {
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   let thumbnailsDisplayed = once(window, EVENTS.THUMBNAILS_DISPLAYED);
   let screenshotDisplayed = once(window, EVENTS.CALL_SCREENSHOT_DISPLAYED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([
+  await Promise.all([
     recordingFinished,
     callListPopulated,
     thumbnailsDisplayed,
     screenshotDisplayed
   ]);
 
   is(SnapshotsListView.itemCount, 1,
     "There should be one snapshot displayed in the UI.");

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-slider-01.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-slider-01.js
@@ -9,17 +9,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_URL);
   let { window, $, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   is(CallsListView.selectedIndex, -1,
     "No item in the function calls list should be initially selected.");
 
   is($("#calls-slider").value, 0,
     "The slider should be moved all the way to the start.");
   is($("#calls-slider").min, 0,
     "The slider minimum value should be 0.");

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-slider-02.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-slider-02.js
@@ -10,17 +10,17 @@ async function ifTestingSupported() {
   let { window, $, EVENTS, gFront, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   let thumbnailsDisplayed = once(window, EVENTS.THUMBNAILS_DISPLAYED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated, thumbnailsDisplayed]);
+  await Promise.all([recordingFinished, callListPopulated, thumbnailsDisplayed]);
 
   let firstSnapshot = SnapshotsListView.getItemAtIndex(0);
   let firstSnapshotOverview = await firstSnapshot.attachment.actor.getOverview();
 
   let thumbnails = firstSnapshotOverview.thumbnails;
   is(thumbnails.length, 4,
     "There should be 4 thumbnails cached for the snapshot item.");
 
@@ -74,19 +74,19 @@ async function ifTestingSupported() {
   await once(window, EVENTS.CALL_SCREENSHOT_DISPLAYED);
   ok(true, "The full-sized screenshot was displayed for the item at index 0.");
 
   await teardown(panel);
   finish();
 }
 
 function waitForMozSetImageElement(panel) {
-  let deferred = defer();
-  panel._onMozSetImageElement = deferred.resolve;
-  return deferred.promise;
+  return new Promise((resolve, reject) => {
+    panel._onMozSetImageElement = resolve;
+  });
 }
 
 function sameArray(a, b) {
   if (a.length != b.length) {
     return false;
   }
   for (let i = 0; i < a.length; i++) {
     if (a[i] !== b[i]) {

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-stepping.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-stepping.js
@@ -9,17 +9,17 @@ async function ifTestingSupported() {
   let { target, panel } = await initCanvasDebuggerFrontend(SIMPLE_CANVAS_URL);
   let { window, $, EVENTS, SnapshotsListView, CallsListView } = panel.panelWin;
 
   await reload(target);
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let callListPopulated = once(window, EVENTS.CALL_LIST_POPULATED);
   SnapshotsListView._onRecordButtonClick();
-  await promise.all([recordingFinished, callListPopulated]);
+  await Promise.all([recordingFinished, callListPopulated]);
 
   checkSteppingButtons(1, 1, 1, 1);
   is(CallsListView.selectedIndex, -1,
     "There should be no selected item in the calls list view initially.");
 
   CallsListView._onResume();
   checkSteppingButtons(1, 1, 1, 1);
   is(CallsListView.selectedIndex, 0,

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-stop-01.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-stop-01.js
@@ -18,17 +18,17 @@ async function ifTestingSupported() {
 
   is($("#empty-notice").hidden, true, "Empty notice not shown");
   is($("#waiting-notice").hidden, false, "Waiting notice shown");
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let recordingCancelled = once(window, EVENTS.SNAPSHOT_RECORDING_CANCELLED);
   SnapshotsListView._onRecordButtonClick();
 
-  await promise.all([recordingFinished, recordingCancelled]);
+  await Promise.all([recordingFinished, recordingCancelled]);
 
   ok(true, "Recording stopped and was considered failed.");
 
   is(SnapshotsListView.itemCount, 0, "No snapshots in the list.");
   is($("#empty-notice").hidden, false, "Empty notice shown");
   is($("#waiting-notice").hidden, true, "Waiting notice not shown");
 
   await teardown(panel);

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-stop-02.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-stop-02.js
@@ -17,17 +17,17 @@ async function ifTestingSupported() {
   await recordingStarted;
 
   is($("#empty-notice").hidden, true, "Empty notice not shown");
   is($("#waiting-notice").hidden, false, "Waiting notice shown");
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let recordingCancelled = once(window, EVENTS.SNAPSHOT_RECORDING_CANCELLED);
 
-  await promise.all([recordingFinished, recordingCancelled]);
+  await Promise.all([recordingFinished, recordingCancelled]);
 
   ok(true, "Recording stopped and was considered failed.");
 
   is(SnapshotsListView.itemCount, 0, "No snapshots in the list.");
   is($("#empty-notice").hidden, false, "Empty notice shown");
   is($("#waiting-notice").hidden, true, "Waiting notice not shown");
 
   await teardown(panel);

--- a/devtools/client/canvasdebugger/test/browser_canvas-frontend-stop-03.js
+++ b/devtools/client/canvasdebugger/test/browser_canvas-frontend-stop-03.js
@@ -18,17 +18,17 @@ async function ifTestingSupported() {
   await recordingStarted;
 
   is($("#empty-notice").hidden, true, "Empty notice not shown");
   is($("#waiting-notice").hidden, false, "Waiting notice shown");
 
   let recordingFinished = once(window, EVENTS.SNAPSHOT_RECORDING_FINISHED);
   let recordingCancelled = once(window, EVENTS.SNAPSHOT_RECORDING_CANCELLED);
 
-  await promise.all([recordingFinished, recordingCancelled]);
+  await Promise.all([recordingFinished, recordingCancelled]);
 
   ok(true, "Recording stopped and was considered failed.");
 
   is(SnapshotsListView.itemCount, 0, "No snapshots in the list.");
   is($("#empty-notice").hidden, false, "Empty notice shown");
   is($("#waiting-notice").hidden, true, "Waiting notice not shown");
 
   await teardown(panel);