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diff --git a/browser/base/content/test/general/browser_devedition.js b/browser/base/content/test/general/browser_devedition.js
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+++ b/browser/base/content/test/general/browser_devedition.js
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+/*
+ * Testing changes for Developer Edition theme.
+ * A special stylesheet should be added to the browser.xul document
+ * when the firefox-devedition@mozilla.org lightweight theme
+ * is applied.
+ */
+
+const PREF_LWTHEME_USED_THEMES = "lightweightThemes.usedThemes";
+const PREF_DEVTOOLS_THEME = "devtools.theme";
+const {LightweightThemeManager} = Components.utils.import("resource://gre/modules/LightweightThemeManager.jsm", {});
+
+LightweightThemeManager.clearBuiltInThemes();
+LightweightThemeManager.addBuiltInTheme(dummyLightweightTheme("firefox-devedition@mozilla.org"));
+
+registerCleanupFunction(() => {
+  // Set preferences back to their original values
+  LightweightThemeManager.currentTheme = null;
+  Services.prefs.clearUserPref(PREF_DEVTOOLS_THEME);
+  Services.prefs.clearUserPref(PREF_LWTHEME_USED_THEMES);
+
+  LightweightThemeManager.currentTheme = null;
+  LightweightThemeManager.clearBuiltInThemes();
+});
+
+add_task(function* startTests() {
+  Services.prefs.setCharPref(PREF_DEVTOOLS_THEME, "dark");
+
+  info ("Setting the current theme to null");
+  LightweightThemeManager.currentTheme = null;
+  ok (!DevEdition.isStyleSheetEnabled, "There is no devedition style sheet when no lw theme is applied.");
+
+  info ("Adding a lightweight theme.");
+  LightweightThemeManager.currentTheme = dummyLightweightTheme("preview0");
+  ok (!DevEdition.isStyleSheetEnabled, "The devedition stylesheet has been removed when a lightweight theme is applied.");
+
+  info ("Applying the devedition lightweight theme.");
+  let onAttributeAdded = waitForBrightTitlebarAttribute();
+  LightweightThemeManager.currentTheme = LightweightThemeManager.getUsedTheme("firefox-devedition@mozilla.org");
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet has been added when the devedition lightweight theme is applied");
+  yield onAttributeAdded;
+  is (document.documentElement.getAttribute("brighttitlebarforeground"), "true",
+     "The brighttitlebarforeground attribute is set on the window.");
+
+  info ("Unapplying all themes.");
+  LightweightThemeManager.currentTheme = null;
+  ok (!DevEdition.isStyleSheetEnabled, "There is no devedition style sheet when no lw theme is applied.");
+
+  info ("Applying the devedition lightweight theme.");
+  onAttributeAdded = waitForBrightTitlebarAttribute();
+  LightweightThemeManager.currentTheme = LightweightThemeManager.getUsedTheme("firefox-devedition@mozilla.org");
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet has been added when the devedition lightweight theme is applied");
+  yield onAttributeAdded;
+  ok (document.documentElement.hasAttribute("brighttitlebarforeground"),
+     "The brighttitlebarforeground attribute is set on the window with dark devtools theme.");
+});
+
+add_task(function* testDevtoolsTheme() {
+  info ("Checking stylesheet and :root attributes based on devtools theme.");
+  Services.prefs.setCharPref(PREF_DEVTOOLS_THEME, "light");
+  is (document.documentElement.getAttribute("devtoolstheme"), "light",
+    "The documentElement has an attribute based on devtools theme.");
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet is still there with the light devtools theme.");
+  ok (!document.documentElement.hasAttribute("brighttitlebarforeground"),
+     "The brighttitlebarforeground attribute is not set on the window with light devtools theme.");
+
+  Services.prefs.setCharPref(PREF_DEVTOOLS_THEME, "dark");
+  is (document.documentElement.getAttribute("devtoolstheme"), "dark",
+    "The documentElement has an attribute based on devtools theme.");
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet is still there with the dark devtools theme.");
+  is (document.documentElement.getAttribute("brighttitlebarforeground"), "true",
+     "The brighttitlebarforeground attribute is set on the window with dark devtools theme.");
+
+  Services.prefs.setCharPref(PREF_DEVTOOLS_THEME, "foobar");
+  is (document.documentElement.getAttribute("devtoolstheme"), "light",
+    "The documentElement has 'light' as a default for the devtoolstheme attribute");
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet is still there with the foobar devtools theme.");
+  ok (!document.documentElement.hasAttribute("brighttitlebarforeground"),
+     "The brighttitlebarforeground attribute is not set on the window with light devtools theme.");
+});
+
+function dummyLightweightTheme(id) {
+  return {
+    id: id,
+    name: id,
+    headerURL: "resource:///chrome/browser/content/browser/defaultthemes/devedition.header.png",
+    iconURL: "resource:///chrome/browser/content/browser/defaultthemes/devedition.icon.png",
+    textcolor: "red",
+    accentcolor: "blue"
+  };
+}
+
+add_task(function* testLightweightThemePreview() {
+  info ("Setting devedition to current and the previewing others");
+  LightweightThemeManager.currentTheme = LightweightThemeManager.getUsedTheme("firefox-devedition@mozilla.org");
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet is enabled.");
+  LightweightThemeManager.previewTheme(dummyLightweightTheme("preview0"));
+  ok (!DevEdition.isStyleSheetEnabled, "The devedition stylesheet is not enabled after a lightweight theme preview.");
+  LightweightThemeManager.resetPreview();
+  LightweightThemeManager.previewTheme(dummyLightweightTheme("preview1"));
+  ok (!DevEdition.isStyleSheetEnabled, "The devedition stylesheet is not enabled after a second lightweight theme preview.");
+  LightweightThemeManager.resetPreview();
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet is enabled again after resetting the preview.");
+  LightweightThemeManager.currentTheme = null;
+  ok (!DevEdition.isStyleSheetEnabled, "The devedition stylesheet is gone after removing the current theme.");
+
+  info ("Previewing the devedition theme");
+  LightweightThemeManager.previewTheme(LightweightThemeManager.getUsedTheme("firefox-devedition@mozilla.org"));
+  ok (DevEdition.isStyleSheetEnabled, "The devedition stylesheet is enabled.");
+  LightweightThemeManager.previewTheme(dummyLightweightTheme("preview2"));
+  LightweightThemeManager.resetPreview();
+  ok (!DevEdition.isStyleSheetEnabled, "The devedition stylesheet is now disabled after resetting the preview.");
+});
+
+// Use a mutation observer to wait for the brighttitlebarforeground
+// attribute to change.  Using this instead of waiting for the load
+// event on the DevEdition styleSheet.
+function waitForBrightTitlebarAttribute() {
+  return new Promise((resolve, reject) => {
+    let mutationObserver = new MutationObserver(function (mutations) {
+      for (let mutation of mutations) {
+        if (mutation.attributeName == "brighttitlebarforeground") {
+          mutationObserver.disconnect();
+          resolve();
+        }
+      }
+    });
+    mutationObserver.observe(document.documentElement, { attributes: true });
+  });
+}