--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1919,8 +1919,13 @@ pref("reader.parse-node-limit", 0);
 pref("browser.pocket.enabled", true);
 pref("browser.pocket.api", "api.getpocket.com");
 pref("browser.pocket.site", "getpocket.com");
 pref("browser.pocket.oAuthConsumerKey", "40249-e88c401e1b1f2242d9e441c4");
 pref("browser.pocket.useLocaleList", true);
 pref("browser.pocket.enabledLocales", "en-US de es-ES ja ja-JP-mac ru");
 
 pref("view_source.tab", true);
+
+// Enable Service Workers for desktop on non-release builds
+#ifndef RELEASE_BUILD
+pref("dom.serviceWorkers.enabled", true);
+#endif

--- a/dom/tests/mochitest/general/test_interfaces.html
+++ b/dom/tests/mochitest/general/test_interfaces.html
@@ -912,21 +912,21 @@ var interfaceNamesInGlobalScope =
     "Screen",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "ScriptProcessorNode",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "ScrollAreaEvent",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Selection",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "ServiceWorker", disabled: true, b2g: false},
+    {name: "ServiceWorker", release: false, b2g: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "ServiceWorkerContainer", disabled: true, b2g: false},
+    {name: "ServiceWorkerContainer", release: false, b2g: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    {name: "ServiceWorkerRegistration", disabled: true, b2g: false},
+    {name: "ServiceWorkerRegistration", release: false, b2g: false},
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "SettingsLock",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "SettingsManager",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "ShadowRoot", // Bogus, but the test harness forces it on.  See bug 1159768.
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "SharedWorker",

--- a/dom/workers/test/test_worker_interfaces.js
+++ b/dom/workers/test/test_worker_interfaces.js
@@ -152,17 +152,17 @@ var interfaceNamesInGlobalScope =
     "PerformanceMeasure",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Promise",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Request",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "Response",
 // IMPORTANT: Do not change this list without review from a DOM peer!
-    { name: "ServiceWorkerRegistration", disabled: true, b2g: false },
+    { name: "ServiceWorkerRegistration", release: false, b2g: false },
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "TextDecoder",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "TextEncoder",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "XMLHttpRequest",
 // IMPORTANT: Do not change this list without review from a DOM peer!
     "XMLHttpRequestEventTarget",

--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -911,8 +911,13 @@ pref("touchcaret.extendedvisibility", tr
 pref("caret.manages-android-actionbar", true);
 
 // Disable sending console to logcat on release builds.
 #ifdef RELEASE_BUILD
 pref("consoleservice.logcat", false);
 #else
 pref("consoleservice.logcat", true);
 #endif
+
+// Enable Service Workers for Android on non-release builds
+#ifndef RELEASE_BUILD
+pref("dom.serviceWorkers.enabled", true);
+#endif