--- a/browser/base/content/test/general/browser.ini
+++ b/browser/base/content/test/general/browser.ini
@@ -277,17 +277,19 @@ skip-if = e10s # Bug ?????? - [JavaScrip
 [browser_contextSearchTabPosition.js]
 skip-if = os == "mac" # bug 967013, bug 926729
 [browser_ctrlTab.js]
 skip-if = e10s # Bug ????? - thumbnail captures need e10s love (tabPreviews_capture fails with Argument 1 of CanvasRenderingContext2D.drawWindow does not implement interface Window.)
 [browser_customize_popupNotification.js]
 [browser_datareporting_notification.js]
 run-if = datareporting
 [browser_devices_get_user_media.js]
-skip-if = (os == "linux" && debug) || e10s # linux: bug 976544; e10s: Bug ?????? - appears user media notifications only happen in the child and don't make their way to the parent?
+skip-if = (os == "linux" && debug) || e10s # linux: bug 976544; e10s: Bug 973001 - appears user media notifications only happen in the child and don't make their way to the parent?
+[browser_devices_get_user_media_about_urls.js]
+skip-if = e10s # Bug 973001 - appears user media notifications only happen in the child and don't make their way to the parent?
 [browser_discovery.js]
 skip-if = e10s # Bug 918663 - DOMLinkAdded events don't make their way to chrome
 [browser_duplicateIDs.js]
 [browser_drag.js]
 skip-if = true # browser_drag.js is disabled, as it needs to be updated for the new behavior from bug 320638.
 [browser_findbarClose.js]
 skip-if = e10s # Bug ?????? - test directly manipulates content (tries to grab an iframe directly from content)
 [browser_fullscreen-window-open.js]

new file mode 100644
--- /dev/null
+++ b/browser/base/content/test/general/browser_devices_get_user_media_about_urls.js
@@ -0,0 +1,260 @@
+/* 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/. */
+
+const kObservedTopics = [
+  "getUserMedia:response:allow",
+  "getUserMedia:revoke",
+  "getUserMedia:response:deny",
+  "getUserMedia:request",
+  "recording-device-events",
+  "recording-window-ended"
+];
+
+const PREF_PERMISSION_FAKE = "media.navigator.permission.fake";
+
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "MediaManagerService",
+                                   "@mozilla.org/mediaManagerService;1",
+                                   "nsIMediaManagerService");
+
+var gTab;
+
+var gObservedTopics = {};
+function observer(aSubject, aTopic, aData) {
+  if (!(aTopic in gObservedTopics))
+    gObservedTopics[aTopic] = 1;
+  else
+    ++gObservedTopics[aTopic];
+}
+
+function promiseObserverCalled(aTopic, aAction) {
+  let deferred = Promise.defer();
+  info("Waiting for " + aTopic);
+
+  Services.obs.addObserver(function observer(aSubject, topic, aData) {
+    ok(true, "got " + aTopic + " notification");
+    info("Message: " + aData);
+    Services.obs.removeObserver(observer, aTopic);
+
+    if (kObservedTopics.indexOf(aTopic) != -1) {
+      if (!(aTopic in gObservedTopics))
+        gObservedTopics[aTopic] = -1;
+      else
+        --gObservedTopics[aTopic];
+    }
+
+    deferred.resolve();
+  }, aTopic, false);
+
+  if (aAction)
+    aAction();
+
+  return deferred.promise;
+}
+
+function promisePopupNotification(aName) {
+  let deferred = Promise.defer();
+
+  waitForCondition(() => PopupNotifications.getNotification(aName),
+                   () => {
+    ok(!!PopupNotifications.getNotification(aName),
+       aName + " notification appeared");
+
+    deferred.resolve();
+  }, "timeout waiting for popup notification " + aName);
+
+  return deferred.promise;
+}
+
+function promiseNoPopupNotification(aName) {
+  let deferred = Promise.defer();
+  info("Waiting for " + aName + " to be removed");
+
+  waitForCondition(() => !PopupNotifications.getNotification(aName),
+                   () => {
+    ok(!PopupNotifications.getNotification(aName),
+       aName + " notification removed");
+    deferred.resolve();
+  }, "timeout waiting for popup notification " + aName + " to disappear");
+
+  return deferred.promise;
+}
+
+function expectObserverCalled(aTopic) {
+  is(gObservedTopics[aTopic], 1, "expected notification " + aTopic);
+  if (aTopic in gObservedTopics)
+    --gObservedTopics[aTopic];
+}
+
+function expectNoObserverCalled() {
+  for (let topic in gObservedTopics) {
+    if (gObservedTopics[topic])
+      is(gObservedTopics[topic], 0, topic + " notification unexpected");
+  }
+  gObservedTopics = {};
+}
+
+function getMediaCaptureState() {
+  let hasVideo = {};
+  let hasAudio = {};
+  MediaManagerService.mediaCaptureWindowState(content, hasVideo, hasAudio);
+  if (hasVideo.value && hasAudio.value)
+    return "CameraAndMicrophone";
+  if (hasVideo.value)
+    return "Camera";
+  if (hasAudio.value)
+    return "Microphone";
+  return "none";
+}
+
+function closeStream(aAlreadyClosed) {
+  expectNoObserverCalled();
+
+  info("closing the stream");
+  content.wrappedJSObject.closeStream();
+
+  if (!aAlreadyClosed)
+    yield promiseObserverCalled("recording-device-events");
+
+  yield promiseNoPopupNotification("webRTC-sharingDevices");
+  if (!aAlreadyClosed)
+    expectObserverCalled("recording-window-ended");
+
+  let statusButton = document.getElementById("webrtc-status-button");
+  ok(statusButton.hidden, "WebRTC status button hidden");
+}
+
+function loadPage(aUrl) {
+  let deferred = Promise.defer();
+
+  gTab.linkedBrowser.addEventListener("load", function onload() {
+    gTab.linkedBrowser.removeEventListener("load", onload, true);
+
+    is(PopupNotifications._currentNotifications.length, 0,
+       "should start the test without any prior popup notification");
+
+    deferred.resolve();
+  }, true);
+  content.location = aUrl;
+  return deferred.promise;
+}
+
+// A fake about module to map get_user_media.html to different about urls.
+function fakeLoopAboutModule() {
+}
+
+fakeLoopAboutModule.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAboutModule]),
+  newChannel: function (aURI) {
+    let rootDir = getRootDirectory(gTestPath);
+    let chan = Services.io.newChannel(rootDir + "get_user_media.html", null, null);
+    chan.owner = Services.scriptSecurityManager.getSystemPrincipal();
+    return chan;
+  },
+  getURIFlags: function (aURI) {
+    return Ci.nsIAboutModule.URI_SAFE_FOR_UNTRUSTED_CONTENT |
+           Ci.nsIAboutModule.ALLOW_SCRIPT |
+           Ci.nsIAboutModule.HIDE_FROM_ABOUTABOUT;
+  }
+};
+
+let factory = XPCOMUtils._getFactory(fakeLoopAboutModule);
+let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
+
+registerCleanupFunction(function() {
+  gBrowser.removeCurrentTab();
+  kObservedTopics.forEach(topic => {
+    Services.obs.removeObserver(observer, topic);
+  });
+  Services.prefs.clearUserPref(PREF_PERMISSION_FAKE);
+});
+
+
+let gTests = [
+
+{
+  desc: "getUserMedia about:loopconversation shouldn't prompt",
+  run: function checkAudioVideoLoop() {
+    let classID = Cc["@mozilla.org/uuid-generator;1"]
+                    .getService(Ci.nsIUUIDGenerator).generateUUID();
+    registrar.registerFactory(classID, "",
+                              "@mozilla.org/network/protocol/about;1?what=loopconversation",
+                              factory);
+
+    yield loadPage("about:loopconversation");
+
+    yield promiseObserverCalled("recording-device-events", () => {
+      info("requesting devices");
+      content.wrappedJSObject.requestDevice(true, true);
+    });
+    // Wait for the devices to actually be captured and running before
+    // proceeding.
+    yield promisePopupNotification("webRTC-sharingDevices");
+
+    is(getMediaCaptureState(), "CameraAndMicrophone",
+       "expected camera and microphone to be shared");
+
+    yield closeStream();
+
+    registrar.unregisterFactory(classID, factory);
+  }
+},
+
+{
+  desc: "getUserMedia about:evil should prompt",
+  run: function checkAudioVideoNonLoop() {
+    let classID = Cc["@mozilla.org/uuid-generator;1"]
+                    .getService(Ci.nsIUUIDGenerator).generateUUID();
+    registrar.registerFactory(classID, "",
+                              "@mozilla.org/network/protocol/about;1?what=evil",
+                              factory);
+
+    yield loadPage("about:evil");
+
+    yield promiseObserverCalled("getUserMedia:request", () => {
+      info("requesting devices");
+      content.wrappedJSObject.requestDevice(true, true);
+    });
+
+    isnot(getMediaCaptureState(), "CameraAndMicrophone",
+       "expected camera and microphone not to be shared");
+
+    registrar.unregisterFactory(classID, factory);
+  }
+},
+
+];
+
+function test() {
+  waitForExplicitFinish();
+
+  Services.prefs.setBoolPref(PREF_PERMISSION_FAKE, true);
+
+  gTab = gBrowser.addTab();
+  gBrowser.selectedTab = gTab;
+
+  kObservedTopics.forEach(topic => {
+    Services.obs.addObserver(observer, topic, false);
+  });
+
+  Task.spawn(function () {
+    for (let test of gTests) {
+      info(test.desc);
+      yield test.run();
+
+      // Cleanup before the next test
+      expectNoObserverCalled();
+    }
+  }).then(finish, ex => {
+    ok(false, "Unexpected Exception: " + ex);
+    finish();
+  });
+}
+
+function wait(time) {
+  let deferred = Promise.defer();
+  setTimeout(deferred.resolve, time);
+  return deferred.promise;
+}

--- a/browser/modules/moz.build
+++ b/browser/modules/moz.build
@@ -19,16 +19,17 @@ EXTRA_JS_MODULES += [
     'offlineAppCache.jsm',
     'PanelFrame.jsm',
     'RemotePrompt.jsm',
     'SharedFrame.jsm',
     'SitePermissions.jsm',
     'Social.jsm',
     'TabCrashReporter.jsm',
     'WebappManager.jsm',
+    'webrtcUI.jsm',
 ]
 
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':
     EXTRA_JS_MODULES += [
         'Windows8WindowFrameColor.jsm',
         'WindowsJumpLists.jsm',
         'WindowsPreviewPerTab.jsm',
     ]
@@ -37,13 +38,12 @@ if CONFIG['NIGHTLY_BUILD']:
     EXTRA_JS_MODULES += [
         'SignInToWebsite.jsm',
     ]
 
 EXTRA_PP_JS_MODULES += [
     'AboutHome.jsm',
     'RecentWindow.jsm',
     'UITour.jsm',
-    'webrtcUI.jsm',
 ]
 
 if CONFIG['MOZILLA_OFFICIAL']:
     DEFINES['MOZILLA_OFFICIAL'] = 1

--- a/browser/modules/webrtcUI.jsm
+++ b/browser/modules/webrtcUI.jsm
@@ -123,38 +123,18 @@ function prompt(aContentWindow, aCallID,
     return;
   }
 
   let uri = aContentWindow.document.documentURIObject;
   let browser = getBrowserForWindow(aContentWindow);
   let chromeDoc = browser.ownerDocument;
   let chromeWin = chromeDoc.defaultView;
   let stringBundle = chromeWin.gNavigatorBundle;
-#ifdef MOZ_LOOP
-  let host;
-  // For Loop protocols that start with about:, use brandShortName instead of the host for now.
-  // Bug 990678 will implement improvements/replacements for the permissions dialog, so this
-  // should become unnecessary.
-  if (uri.spec.startsWith("about:loop")) {
-    let brandBundle = Services.strings.createBundle("chrome://branding/locale/brand.properties");
-
-    host = brandBundle.GetStringFromName("brandShortName");
-  }
-  else {
-    // uri.host throws for about: protocols, so we have to do this once we know
-    // it isn't about:loop.
-    host = uri.host;
-  }
-
-  let message = stringBundle.getFormattedString("getUserMedia.share" + requestType + ".message",
-                                                [ host ]);
-#else
   let message = stringBundle.getFormattedString("getUserMedia.share" + requestType + ".message",
                                                 [ uri.host ]);
-#endif
 
   let mainAction = {
     label: PluralForm.get(requestType == "CameraAndMicrophone" ? 2 : 1,
                           stringBundle.getString("getUserMedia.shareSelectedDevices.label")),
     accessKey: stringBundle.getString("getUserMedia.shareSelectedDevices.accesskey"),
     // The real callback will be set during the "showing" event. The
     // empty function here is so that PopupNotifications.show doesn't
     // reject the action.

--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -18,16 +18,17 @@
 #include "nsIScriptGlobalObject.h"
 #include "nsIPermissionManager.h"
 #include "nsIPopupWindowManager.h"
 #include "nsISupportsArray.h"
 #include "nsIDocShell.h"
 #include "nsIDocument.h"
 #include "nsISupportsPrimitives.h"
 #include "nsIInterfaceRequestorUtils.h"
+#include "nsNetUtil.h"
 #include "mozilla/Types.h"
 #include "mozilla/PeerIdentity.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/dom/MediaStreamBinding.h"
 #include "mozilla/dom/MediaStreamTrackBinding.h"
 #include "mozilla/dom/GetUserMediaRequestBinding.h"
 #include "mozilla/Preferences.h"
 #include "MediaTrackConstraints.h"
@@ -1472,23 +1473,38 @@ MediaManager::GetUserMedia(bool aPrivile
 
 #if defined(ANDROID) && !defined(MOZ_WIDGET_GONK)
   if (c.mPicture) {
     // ShowFilePickerForMimeType() must run on the Main Thread! (on Android)
     NS_DispatchToMainThread(runnable);
     return NS_OK;
   }
 #endif
+  nsIURI* docURI = aWindow->GetDocumentURI();
+#ifdef MOZ_LOOP
+  {
+    bool isLoop = false;
+    nsCOMPtr<nsIURI> loopURI;
+    nsresult rv = NS_NewURI(getter_AddRefs(loopURI), "about:loopconversation");
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = docURI->EqualsExceptRef(loopURI, &isLoop);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (isLoop) {
+      aPrivileged = true;
+    }
+  }
+#endif
+
   // XXX No full support for picture in Desktop yet (needs proper UI)
   if (aPrivileged ||
       (c.mFake && !Preferences::GetBool("media.navigator.permission.fake"))) {
     mMediaThread->Dispatch(runnable, NS_DISPATCH_NORMAL);
   } else {
     bool isHTTPS = false;
-    nsIURI* docURI = aWindow->GetDocumentURI();
     if (docURI) {
       docURI->SchemeIs("https", &isHTTPS);
     }
 
     // Check if this site has persistent permissions.
     nsresult rv;
     nsCOMPtr<nsIPermissionManager> permManager =
       do_GetService(NS_PERMISSIONMANAGER_CONTRACTID, &rv);