diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_962884_opt_in_disable_hyphens.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_962884_opt_in_disable_hyphens.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+/* 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() {
+  const kNormalLabel = "Character Encoding";
+  CustomizableUI.addWidgetToArea("characterencoding-button", CustomizableUI.AREA_NAVBAR);
+  let characterEncoding = document.getElementById("characterencoding-button");
+  const kOriginalLabel = characterEncoding.getAttribute("label");
+  characterEncoding.setAttribute("label", "\u00ad" + kNormalLabel);
+  CustomizableUI.addWidgetToArea("characterencoding-button", CustomizableUI.AREA_PANEL);
+
+  yield PanelUI.show();
+
+  is(characterEncoding.getAttribute("auto-hyphens"), "off",
+     "Hyphens should be disabled if the ­ character is present in the label");
+  let multilineText = document.getAnonymousElementByAttribute(characterEncoding, "class", "toolbarbutton-multiline-text");
+  let multilineTextCS = getComputedStyle(multilineText);
+  is(multilineTextCS.MozHyphens, "manual", "-moz-hyphens should be set to manual when the ­ character is present.")
+
+  let hiddenPanelPromise = promisePanelHidden(window);
+  PanelUI.toggle();
+  yield hiddenPanelPromise;
+
+  characterEncoding.setAttribute("label", kNormalLabel);
+
+  yield PanelUI.show();
+
+  isnot(characterEncoding.getAttribute("auto-hyphens"), "off",
+        "Hyphens should not be disabled if the ­ character is not present in the label");
+  multilineText = document.getAnonymousElementByAttribute(characterEncoding, "class", "toolbarbutton-multiline-text");
+  let multilineTextCS = getComputedStyle(multilineText);
+  is(multilineTextCS.MozHyphens, "auto", "-moz-hyphens should be set to auto by default.")
+
+  hiddenPanelPromise = promisePanelHidden(window);
+  PanelUI.toggle();
+  yield hiddenPanelPromise;
+
+  characterEncoding.setAttribute("label", "\u00ad" + kNormalLabel);
+  CustomizableUI.removeWidgetFromArea("characterencoding-button");
+  yield startCustomizing();
+
+  isnot(characterEncoding.getAttribute("auto-hyphens"), "off",
+        "Hyphens should not be disabled when the widget is in the palette");
+
+  gCustomizeMode.addToPanel(characterEncoding);
+  is(characterEncoding.getAttribute("auto-hyphens"), "off",
+     "Hyphens should be disabled if the ­ character is present in the label in customization mode");
+  let multilineText = document.getAnonymousElementByAttribute(characterEncoding, "class", "toolbarbutton-multiline-text");
+  let multilineTextCS = getComputedStyle(multilineText);
+  is(multilineTextCS.MozHyphens, "manual", "-moz-hyphens should be set to manual when the ­ character is present in customization mode.")
+
+  yield endCustomizing();
+
+  CustomizableUI.addWidgetToArea("characterencoding-button", CustomizableUI.AREA_NAVBAR);
+  ok(!characterEncoding.hasAttribute("auto-hyphens"),
+     "Removing the widget from the panel should remove the auto-hyphens attribute");
+
+  characterEncoding.setAttribute("label", kOriginalLabel);
+});
+
+add_task(function asyncCleanup() {
+  yield endCustomizing();
+  yield resetCustomization();
+});