diff --git a/browser/components/customizableui/test/browser.ini b/browser/components/customizableui/test/browser.ini
index 7026b861f4d..c049ba87afd 100644
--- a/browser/components/customizableui/test/browser.ini
+++ b/browser/components/customizableui/test/browser.ini
@@ -65,19 +65,6 @@ skip-if = e10s # Bug ?????? - test uses promiseTabLoadEvent() which isn't e10s f
 [browser_943683_migration_test.js]
 [browser_944887_destroyWidget_should_destroy_in_palette.js]
 [browser_945739_showInPrivateBrowsing_customize_mode.js]
-[browser_947914_button_addons.js]
-[browser_947914_button_copy.js]
-[browser_947914_button_cut.js]
-[browser_947914_button_find.js]
-[browser_947914_button_history.js]
-[browser_947914_button_newPrivateWindow.js]
-[browser_947914_button_newWindow.js]
-[browser_947914_button_paste.js]
-[browser_947914_button_print.js]
-[browser_947914_button_savePage.js]
-[browser_947914_button_zoomIn.js]
-[browser_947914_button_zoomOut.js]
-[browser_947914_button_zoomReset.js]
 [browser_947987_removable_default.js]
 [browser_948985_non_removable_defaultArea.js]
 [browser_952963_areaType_getter_no_area.js]
diff --git a/browser/components/customizableui/test/browser_947914_button_addons.js b/browser/components/customizableui/test/browser_947914_button_addons.js
deleted file mode 100644
index 9ee8d27a6a2..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_addons.js
+++ /dev/null
@@ -1,34 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check addons button existence and functionality");
-
-  let initialLocation = gBrowser.currentURI.spec;
-
-  yield PanelUI.show();
-
-  let addonsButton = document.getElementById("add-ons-button");
-  ok(addonsButton, "Add-ons button exists in Panel Menu");
-  addonsButton.click();
-
-  yield waitForCondition(function() gBrowser.currentURI &&
-                                    gBrowser.currentURI.spec == "about:addons");
-
-  let addonsPage = gBrowser.selectedBrowser.contentWindow.document.
-                            getElementById("addons-page");
-  ok(addonsPage, "Add-ons page was opened");
-
-  // close the add-ons tab
-  if(gBrowser.tabs.length > 1) {
-    gBrowser.removeTab(gBrowser.selectedTab);
-  }
-  else {
-    var tabToRemove = gBrowser.selectedTab;
-    gBrowser.addTab(initialLocation);
-    gBrowser.removeTab(tabToRemove);
-  }
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_copy.js b/browser/components/customizableui/test/browser_947914_button_copy.js
deleted file mode 100644
index dde2391ebb8..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_copy.js
+++ /dev/null
@@ -1,51 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check copy button existence and functionality");
-
-  var testText = "copy text test";
-  let initialLocation = gBrowser.currentURI.spec;
-
-  yield PanelUI.show();
-
-  let copyButton = document.getElementById("copy-button");
-  ok(copyButton, "Copy button exists in Panel Menu");
-  is(copyButton.getAttribute("disabled"), "true", "Copy button is initially disabled");
-
-  // copy text from URL bar
-  gURLBar.value = testText;
-  gURLBar.focus();
-  gURLBar.select();
-  yield PanelUI.show();
-
-  ok(!copyButton.hasAttribute("disabled"), "Copy button gets enabled");
-
-  copyButton.click();
-  is(gURLBar.value, testText, "Selected text is unaltered when clicking copy");
-
-  // check that the text was added to the clipboard
-  let clipboard = Services.clipboard;
-  let transferable = Cc["@mozilla.org/widget/transferable;1"].createInstance(Ci.nsITransferable);
-  const globalClipboard = clipboard.kGlobalClipboard;
-
-  transferable.init(null);
-  transferable.addDataFlavor("text/unicode");
-  clipboard.getData(transferable, globalClipboard);
-  let str = {}, strLength = {};
-  transferable.getTransferData("text/unicode", str, strLength);
-  let clipboardValue = "";
-
-  if (str.value) {
-    str.value.QueryInterface(Ci.nsISupportsString);
-    clipboardValue = str.value.data;
-  }
-  is(clipboardValue, testText, "Data was copied to the clipboard.");
-
-  // restore the tab location and clear the clipboard
-  Services.clipboard.emptyClipboard(globalClipboard);
-  gURLBar.value = initialLocation;
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_cut.js b/browser/components/customizableui/test/browser_947914_button_cut.js
deleted file mode 100644
index cc404e514a6..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_cut.js
+++ /dev/null
@@ -1,50 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check cut button existence and functionality");
-
-  var testText = "cut text test";
-  let initialLocation = gBrowser.currentURI.spec;
-
-  yield PanelUI.show();
-
-  let cutButton = document.getElementById("cut-button");
-  ok(cutButton, "Cut button exists in Panel Menu");
-  ok(cutButton.getAttribute("disabled"), "Cut button is disabled");
-
-  // cut text from URL bar
-  gURLBar.value = testText;
-  gURLBar.focus();
-  gURLBar.select();
-  yield PanelUI.show();
-
-  ok(!cutButton.hasAttribute("disabled"), "Cut button gets enabled");
-  cutButton.click();
-  is(gURLBar.value, "", "Selected text is removed from source when clicking on cut");
-
-  // check that the text was added to the clipboard
-  let clipboard = Services.clipboard;
-  let transferable = Cc["@mozilla.org/widget/transferable;1"].createInstance(Ci.nsITransferable);
-  const globalClipboard = clipboard.kGlobalClipboard;
-
-  transferable.init(null);
-  transferable.addDataFlavor("text/unicode");
-  clipboard.getData(transferable, globalClipboard);
-  let str = {}, strLength = {};
-  transferable.getTransferData("text/unicode", str, strLength);
-  let clipboardValue = "";
-
-  if (str.value) {
-    str.value.QueryInterface(Ci.nsISupportsString);
-    clipboardValue = str.value.data;
-  }
-  is(clipboardValue, testText, "Data was copied to the clipboard.");
-
-  // restore the tab location and clear the clipboard
-  gBrowser.value = initialLocation;
-  Services.clipboard.emptyClipboard(globalClipboard);
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_find.js b/browser/components/customizableui/test/browser_947914_button_find.js
deleted file mode 100644
index 8c766bb5fe8..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_find.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check find button existence and functionality");
-
-  yield PanelUI.show();
-
-  let findButton = document.getElementById("find-button");
-  ok(findButton, "Find button exists in Panel Menu");
-
-  findButton.click();
-  ok(!gFindBar.hasAttribute("hidden"), "Findbar opened successfully");
-
-  // close find bar
-  gFindBar.close();
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_history.js b/browser/components/customizableui/test/browser_947914_button_history.js
deleted file mode 100644
index e286ab4273e..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_history.js
+++ /dev/null
@@ -1,22 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check history button existence and functionality");
-
-  yield PanelUI.show();
-
-  let historyButton = document.getElementById("history-panelmenu");
-  ok(historyButton, "History button appears in Panel Menu");
-
-  historyButton.click();
-  let historyPanel = document.getElementById("PanelUI-history");
-  ok(historyPanel.getAttribute("current"), "History Panel is in view");
-
-  let panelHiddenPromise = promisePanelHidden(window);
-  PanelUI.hide();
-  yield panelHiddenPromise
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_newPrivateWindow.js b/browser/components/customizableui/test/browser_947914_button_newPrivateWindow.js
deleted file mode 100644
index a4e9e10e67a..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_newPrivateWindow.js
+++ /dev/null
@@ -1,45 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check private browsing button existence and functionality");
-  yield PanelUI.show();
-
-  var windowWasHandled = false;
-  let privateWindow = null;
-
-  let observerWindowOpened = {
-    observe: function(aSubject, aTopic, aData) {
-      if (aTopic == "domwindowopened") {
-        privateWindow = aSubject.QueryInterface(Components.interfaces.nsIDOMWindow);
-        privateWindow.addEventListener("load", function newWindowHandler() {
-          privateWindow.removeEventListener("load", newWindowHandler, false);
-          is(privateWindow.location.href, "chrome://browser/content/browser.xul",
-             "A new browser window was opened");
-          ok(PrivateBrowsingUtils.isWindowPrivate(privateWindow), "Window is private");
-          windowWasHandled = true;
-        }, false);
-      }
-    }
-  }
-
-  Services.ww.registerNotification(observerWindowOpened);
-
-  let privateBrowsingButton = document.getElementById("privatebrowsing-button");
-  ok(privateBrowsingButton, "Private browsing button exists in Panel Menu");
-  privateBrowsingButton.click();
-
-  try{
-    yield waitForCondition(() => windowWasHandled);
-    yield promiseWindowClosed(privateWindow);
-  }
-  catch(e) {
-    ok(false, "The new private browser window was not properly handled");
-  }
-  finally {
-    Services.ww.unregisterNotification(observerWindowOpened);
-  }
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_newWindow.js b/browser/components/customizableui/test/browser_947914_button_newWindow.js
deleted file mode 100644
index 57c2581740c..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_newWindow.js
+++ /dev/null
@@ -1,45 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check new window button existence and functionality");
-  yield PanelUI.show();
-
-  var windowWasHandled = false;
-  var newWindow = null;
-
-  let observerWindowOpened = {
-    observe: function(aSubject, aTopic, aData) {
-      if (aTopic == "domwindowopened") {
-        newWindow = aSubject.QueryInterface(Components.interfaces.nsIDOMWindow);
-        newWindow.addEventListener("load", function newWindowHandler() {
-          newWindow.removeEventListener("load", newWindowHandler, false);
-          is(newWindow.location.href, "chrome://browser/content/browser.xul",
-             "A new browser window was opened");
-          ok(!PrivateBrowsingUtils.isWindowPrivate(newWindow), "Window is not private");
-          windowWasHandled = true;
-        }, false);
-      }
-    }
-  }
-
-  Services.ww.registerNotification(observerWindowOpened);
-
-  let newWindowButton = document.getElementById("new-window-button");
-  ok(newWindowButton, "New Window button exists in Panel Menu");
-  newWindowButton.click();
-
-  try{
-    yield waitForCondition(() => windowWasHandled);
-    yield promiseWindowClosed(newWindow);
-  }
-  catch(e) {
-    ok(false, "The new browser window was not properly handled");
-  }
-  finally {
-    Services.ww.unregisterNotification(observerWindowOpened);
-  }
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_paste.js b/browser/components/customizableui/test/browser_947914_button_paste.js
deleted file mode 100644
index 8895c812ab5..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_paste.js
+++ /dev/null
@@ -1,35 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check paste button existence and functionality");
-
-  let initialLocation = gBrowser.currentURI.spec;
-  let clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].getService(Ci.nsIClipboardHelper);
-  const globalClipboard = Services.clipboard.kGlobalClipboard;
-
-  yield PanelUI.show();
-
-  let pasteButton = document.getElementById("paste-button");
-  ok(pasteButton, "Paste button exists in Panel Menu");
-
-  // add text to clipboard
-  var text = "Sample text for testing";
-  clipboard.copyString(text);
-
-  // test paste button by pasting text to URL bar
-  gURLBar.focus();
-  yield PanelUI.show();
-
-  ok(!pasteButton.hasAttribute("disabled"), "Paste button is enabled");
-  pasteButton.click();
-
-  is(gURLBar.value, text, "Text pasted successfully");
-
-  // clear the clipboard and restore the tab location as it was at the begining of the test
-  Services.clipboard.emptyClipboard(globalClipboard);
-  gURLBar.value = initialLocation;
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_print.js b/browser/components/customizableui/test/browser_947914_button_print.js
deleted file mode 100644
index e4b7e9dac33..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_print.js
+++ /dev/null
@@ -1,32 +0,0 @@
-/* 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 isOSX = (Services.appinfo.OS === "Darwin");
-
-add_task(function() {
-  info("Check print button existence and functionality");
-
-  yield PanelUI.show();
-
-  let printButton = document.getElementById("print-button");
-  ok(printButton, "Print button exists in Panel Menu");
-
-  if(isOSX) {
-    let panelHiddenPromise = promisePanelHidden(window);
-    PanelUI.hide();
-    yield panelHiddenPromise;
-  }
-  else {
-    printButton.click();
-    yield waitForCondition(() => window.gInPrintPreviewMode);
-
-    ok(window.gInPrintPreviewMode, "Entered print preview mode");
-
-    // close print preview
-    PrintUtils.exitPrintPreview();
-    yield waitForCondition(() => !window.gInPrintPreviewMode);
-  }
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_savePage.js b/browser/components/customizableui/test/browser_947914_button_savePage.js
deleted file mode 100644
index 4cc7de86fc6..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_savePage.js
+++ /dev/null
@@ -1,18 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check save page button existence");
-
-  yield PanelUI.show();
-
-  let savePageButton = document.getElementById("save-page-button");
-  ok(savePageButton, "Save Page button exists in Panel Menu");
-
-  let panelHiddenPromise = promisePanelHidden(window);
-  PanelUI.hide();
-  yield panelHiddenPromise;
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_zoomIn.js b/browser/components/customizableui/test/browser_947914_button_zoomIn.js
deleted file mode 100644
index 9ec48646ca8..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_zoomIn.js
+++ /dev/null
@@ -1,31 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check zoom in button existence and functionality");
-
-  let initialPageZoom = ZoomManager.zoom;
-  is(initialPageZoom, 1, "Initial zoom factor should be 1");
-
-  yield PanelUI.show();
-
-  let zoomInButton = document.getElementById("zoom-in-button");
-  ok(zoomInButton, "Zoom in button exists in Panel Menu");
-
-  zoomInButton.click();
-  let pageZoomLevel = parseInt(ZoomManager.zoom * 100);
-  let zoomResetButton = document.getElementById("zoom-reset-button");
-  let expectedZoomLevel = parseInt(zoomResetButton.getAttribute("label"), 10);
-  ok(pageZoomLevel > 100 && pageZoomLevel == expectedZoomLevel, "Page zoomed in correctly");
-
-  // close the Panel
-  let panelHiddenPromise = promisePanelHidden(window);
-  PanelUI.hide();
-  yield panelHiddenPromise;
-
-  // reset zoom level
-  ZoomManager.zoom = initialPageZoom;
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_zoomOut.js b/browser/components/customizableui/test/browser_947914_button_zoomOut.js
deleted file mode 100644
index 468874b2190..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_zoomOut.js
+++ /dev/null
@@ -1,32 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check zoom out button existence and functionality");
-
-  let initialPageZoom = ZoomManager.zoom;
-  is(initialPageZoom, 1, "Initial zoom factor should be 1");
-
-  yield PanelUI.show();
-
-  let zoomOutButton = document.getElementById("zoom-out-button");
-  ok(zoomOutButton, "Zoom out button exists in Panel Menu");
-
-  zoomOutButton.click();
-  let pageZoomLevel = Math.round(ZoomManager.zoom*100);
-
-  let zoomResetButton = document.getElementById("zoom-reset-button");
-  let expectedZoomLevel = parseInt(zoomResetButton.getAttribute("label"), 10);
-  ok(pageZoomLevel < 100 && pageZoomLevel == expectedZoomLevel, "Page zoomed out correctly");
-
-  // close the panel
-  let panelHiddenPromise = promisePanelHidden(window);
-  PanelUI.hide();
-  yield panelHiddenPromise;
-
-  // reset zoom level
-  ZoomManager.zoom = initialPageZoom;
-});
diff --git a/browser/components/customizableui/test/browser_947914_button_zoomReset.js b/browser/components/customizableui/test/browser_947914_button_zoomReset.js
deleted file mode 100644
index 8898f4fb990..00000000000
--- a/browser/components/customizableui/test/browser_947914_button_zoomReset.js
+++ /dev/null
@@ -1,30 +0,0 @@
-/* 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";
-
-add_task(function() {
-  info("Check zoom reset button existence and functionality");
-
-  let initialPageZoom = ZoomManager.zoom;
-  is(initialPageZoom, 1, "Initial zoom factor should be 1");
-  ZoomManager.zoom = 0.5;
-  yield PanelUI.show();
-
-  let zoomResetButton = document.getElementById("zoom-reset-button");
-  ok(zoomResetButton, "Zoom reset button exists in Panel Menu");
-
-  zoomResetButton.click();
-  let pageZoomLevel = parseInt(ZoomManager.zoom * 100);
-  let expectedZoomLevel = parseInt(zoomResetButton.getAttribute("label"), 10);
-  ok(pageZoomLevel == expectedZoomLevel && pageZoomLevel == 100, "Page zoom reset correctly");
-
-  // close the panel
-  let panelHiddenPromise = promisePanelHidden(window);
-  PanelUI.hide();
-  yield panelHiddenPromise;
-
-  //reset the zoom level
-  ZoomManager.zoom = initialPageZoom;
-});