--- a/browser/components/places/tests/browser/browser_0_library_left_pane_migration.js
+++ b/browser/components/places/tests/browser/browser_0_library_left_pane_migration.js
@@ -10,19 +10,16 @@
  *  Test we correctly migrate Library left pane to the latest version.
  *  Note: this test MUST be the first between browser chrome tests, or results
  *        of next tests could be unexpected due to PlacesUIUtils getters.
  */
 
 const TEST_URI = "http://www.mozilla.org/";
 
 add_task(async function() {
-  // Sanity checks.
-  ok(PlacesUtils, "PlacesUtils is running in chrome context");
-  ok(PlacesUIUtils, "PlacesUIUtils is running in chrome context");
   ok(PlacesUIUtils.ORGANIZER_LEFTPANE_VERSION > 0,
      "Left pane version in chrome context, current version is: " + PlacesUIUtils.ORGANIZER_LEFTPANE_VERSION );
 
   // Check if we have any left pane folder already set, remove it eventually.
   let leftPaneItems = PlacesUtils.annotations
                                  .getItemsWithAnnotation(PlacesUIUtils.ORGANIZER_FOLDER_ANNO);
   if (leftPaneItems.length > 0) {
     // The left pane has already been created, touching it now would cause

--- a/browser/components/places/tests/browser/browser_bookmark_folder_moveability.js
+++ b/browser/components/places/tests/browser/browser_bookmark_folder_moveability.js
@@ -1,19 +1,14 @@
 /* vim:set ts=2 sw=2 sts=2 et: */
 /* 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/. */
 
 function test() {
-  // sanity check
-  ok(PlacesUtils, "checking PlacesUtils, running in chrome context?");
-  ok(PlacesUIUtils, "checking PlacesUIUtils, running in chrome context?");
-  ok(PlacesControllerDragHelper, "checking PlacesControllerDragHelper, running in chrome context?");
-
   const IDX = PlacesUtils.bookmarks.DEFAULT_INDEX;
 
   // setup
   var rootId = PlacesUtils.bookmarks.createFolder(PlacesUtils.toolbarFolderId, "", IDX);
   var rootNode = PlacesUtils.getFolderContents(rootId, false, true).root;
   is(rootNode.childCount, 0, "confirm test root is empty");
 
   var tests = [];

--- a/browser/components/places/tests/browser/browser_bookmarksProperties.js
+++ b/browser/components/places/tests/browser/browser_bookmarksProperties.js
@@ -355,20 +355,16 @@ gTests.push({
 });
 
 // ------------------------------------------------------------------------------
 
 add_task(async function test_setup() {
   // This test can take some time, if we timeout too early it could run
   // in the middle of other tests, or hang them.
   requestLongerTimeout(2);
-
-  // Sanity checks.
-  Assert.ok(PlacesUtils, "PlacesUtils in context");
-  Assert.ok(PlacesUIUtils, "PlacesUIUtils in context");
 });
 
 add_task(async function test_run() {
   for (let test of gTests) {
     info(`Start of test: ${test.desc}`);
     await test.setup();
 
     await execute_test_in_sidebar(test);

--- a/browser/components/places/tests/browser/browser_copy_folder_tree.js
+++ b/browser/components/places/tests/browser/browser_copy_folder_tree.js
@@ -13,20 +13,16 @@
  - validate folder B
  - undo copy transaction
  - validate folder B (empty)
  - redo copy transaction
  - validate folder B's contents
 */
 
 add_task(async function() {
-  // sanity check
-  ok(PlacesUtils, "checking PlacesUtils, running in chrome context?");
-  ok(PlacesUIUtils, "checking PlacesUIUtils, running in chrome context?");
-
   let toolbarId = PlacesUtils.toolbarFolderId;
   let toolbarNode = PlacesUtils.getFolderContents(toolbarId).root;
 
   let oldCount = toolbarNode.childCount;
   let testRoot = await PlacesUtils.bookmarks.insert({
     parentGuid: PlacesUtils.bookmarks.toolbarGuid,
     type: PlacesUtils.bookmarks.TYPE_FOLDER,
     title: "test root"

--- a/browser/components/places/tests/browser/browser_cutting_bookmarks.js
+++ b/browser/components/places/tests/browser/browser_cutting_bookmarks.js
@@ -12,22 +12,16 @@ add_task(async function() {
   registerCleanupFunction(async function() {
     await promiseLibraryClosed(organizer);
     await PlacesUtils.bookmarks.eraseEverything();
   });
 
   let PlacesOrganizer = organizer.PlacesOrganizer;
   let ContentTree = organizer.ContentTree;
 
-  // Sanity checks.
-  ok(PlacesUtils, "PlacesUtils in scope");
-  ok(PlacesUIUtils, "PlacesUIUtils in scope");
-  ok(PlacesOrganizer, "PlacesOrganizer in scope");
-  ok(ContentTree, "ContentTree is in scope");
-
   // Test with multiple entries to ensure they retain their order.
   let bookmarks = [];
   bookmarks.push(await PlacesUtils.bookmarks.insert({
     parentGuid: PlacesUtils.bookmarks.toolbarGuid,
     type: PlacesUtils.bookmarks.TYPE_BOOKMARK,
     url: TEST_URL,
     title: "0"
   }));

--- a/browser/components/places/tests/browser/browser_library_left_pane_fixnames.js
+++ b/browser/components/places/tests/browser/browser_library_left_pane_fixnames.js
@@ -29,22 +29,16 @@ function onLibraryReady(organizer) {
       // Close Library window.
       organizer.close();
       // No need to cleanup anything, we have a correct left pane now.
       finish();
 }
 
 function test() {
   waitForExplicitFinish();
-  // Sanity checks.
-  ok(PlacesUtils, "PlacesUtils is running in chrome context");
-  ok(PlacesUIUtils, "PlacesUIUtils is running in chrome context");
-  ok(PlacesUIUtils.ORGANIZER_LEFTPANE_VERSION > 0,
-     "Left pane version in chrome context, current version is: " + PlacesUIUtils.ORGANIZER_LEFTPANE_VERSION );
-
   // Ensure left pane is initialized.
   ok(PlacesUIUtils.leftPaneFolderId > 0, "left pane folder is initialized");
 
   // Get the left pane folder.
   var leftPaneItems = PlacesUtils.annotations
                                  .getItemsWithAnnotation(PlacesUIUtils.ORGANIZER_FOLDER_ANNO);
 
   is(leftPaneItems.length, 1, "We correctly have only 1 left pane folder");

--- a/browser/components/places/tests/browser/browser_library_views_liveupdate.js
+++ b/browser/components/places/tests/browser/browser_library_views_liveupdate.js
@@ -10,20 +10,16 @@ var gLibrary = null;
 
 function test() {
   waitForExplicitFinish();
   // This test takes quite some time, and timeouts frequently, so we require
   // more time to run.
   // See Bug 525610.
   requestLongerTimeout(2);
 
-  // Sanity checks.
-  ok(PlacesUtils, "PlacesUtils in context");
-  ok(PlacesUIUtils, "PlacesUIUtils in context");
-
   // Open Library, we will check the left pane.
   openLibrary(function(library) {
     gLibrary = library;
     startTest();
   });
 }
 
 /**

--- a/browser/components/places/tests/browser/browser_views_liveupdate.js
+++ b/browser/components/places/tests/browser/browser_views_liveupdate.js
@@ -16,20 +16,16 @@ function test() {
   if (wasCollapsed) {
     promiseSetToolbarVisibility(toolbar, true).then(openBookmarksSidebar);
   } else {
     openBookmarksSidebar();
   }
 }
 
 function openBookmarksSidebar() {
-  // Sanity checks.
-  ok(PlacesUtils, "PlacesUtils in context");
-  ok(PlacesUIUtils, "PlacesUIUtils in context");
-
   // Open bookmarks menu.
   var popup = document.getElementById("bookmarksMenuPopup");
   ok(popup, "Menu popup element exists");
   fakeOpenPopup(popup);
 
   // Open bookmarks sidebar.
   var sidebar = document.getElementById("sidebar");
   sidebar.addEventListener("load", function() {

--- a/browser/components/places/tests/chrome/test_0_multiple_left_pane.xul
+++ b/browser/components/places/tests/chrome/test_0_multiple_left_pane.xul
@@ -32,23 +32,16 @@
 
   <script type="application/javascript">
   <![CDATA[
 
     function runTest() {
       SimpleTest.waitForExplicitFinish();
 
       (async function() {
-        // Sanity checks.
-        ok(PlacesUtils, "PlacesUtils is running in chrome context");
-        ok(PlacesUIUtils, "PlacesUIUtils is running in chrome context");
-        ok(PlacesUIUtils.ORGANIZER_LEFTPANE_VERSION > 0,
-           "Left pane version in chrome context, " +
-             "current version is: " + PlacesUIUtils.ORGANIZER_LEFTPANE_VERSION );
-
         let fakeLeftPanes = [];
         // We need 2 left pane folders to simulate a corrupt profile.
         do {
           let leftPaneItems = PlacesUtils.annotations.getItemsWithAnnotation(PlacesUIUtils.ORGANIZER_FOLDER_ANNO);
 
           // Create a fake left pane folder.
           let folder = await PlacesUtils.bookmarks.insert({
             parentGuid: PlacesUtils.bookmarks.rootGuid,