diff -r 000000000000 -r 6474c204b198 widget/cocoa/nsMacWebAppUtils.mm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/cocoa/nsMacWebAppUtils.mm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,82 @@
+/* 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/. */
+
+#import <Cocoa/Cocoa.h>
+
+#include "nsMacWebAppUtils.h"
+#include "nsCOMPtr.h"
+#include "nsCocoaUtils.h"
+#include "nsString.h"
+
+// This must be included last:
+#include "nsObjCExceptions.h"
+
+// Find the path to the app with the given bundleIdentifier, if any.
+// Note that the OS will return the path to the newest binary, if there is more than one.
+// The determination of 'newest' is complex and beyond the scope of this comment.
+
+NS_IMPL_ISUPPORTS(nsMacWebAppUtils, nsIMacWebAppUtils)
+
+NS_IMETHODIMP nsMacWebAppUtils::PathForAppWithIdentifier(const nsAString& bundleIdentifier, nsAString& outPath) {
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
+
+  outPath.Truncate();
+
+  nsAutoreleasePool localPool;
+
+  //note that the result of this expression might be nil, meaning no matching app was found. 
+  NSString* temp = [[NSWorkspace sharedWorkspace] absolutePathForAppBundleWithIdentifier:
+                        [NSString stringWithCharacters:reinterpret_cast<const unichar*>(((nsString)bundleIdentifier).get())
+                                                length:((nsString)bundleIdentifier).Length()]];
+
+  if (temp) {
+    // Copy out the resultant absolute path into outPath if non-nil.
+    nsCocoaUtils::GetStringForNSString(temp, outPath);
+  }
+
+  return NS_OK;
+
+  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
+}
+
+NS_IMETHODIMP nsMacWebAppUtils::LaunchAppWithIdentifier(const nsAString& bundleIdentifier) {
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
+
+  nsAutoreleasePool localPool;
+
+  // Note this might return false, meaning the app wasnt launched for some reason. 
+  BOOL success = [[NSWorkspace sharedWorkspace] launchAppWithBundleIdentifier:
+                        [NSString stringWithCharacters:reinterpret_cast<const unichar*>(((nsString)bundleIdentifier).get())
+                                                length:((nsString)bundleIdentifier).Length()]
+                        options: (NSWorkspaceLaunchOptions)0
+                        additionalEventParamDescriptor: nil
+                        launchIdentifier: NULL];
+
+  return success ? NS_OK : NS_ERROR_FAILURE;
+
+  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
+}
+
+NS_IMETHODIMP nsMacWebAppUtils::TrashApp(const nsAString& path, nsITrashAppCallback* aCallback) {
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
+
+  if (NS_WARN_IF(!aCallback)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsCOMPtr<nsITrashAppCallback> callback = aCallback;
+
+  NSString* tempString = [NSString stringWithCharacters:reinterpret_cast<const unichar*>(((nsString)path).get())
+                                   length:path.Length()];
+
+  [[NSWorkspace sharedWorkspace] recycleURLs: [NSArray arrayWithObject:[NSURL fileURLWithPath:tempString]]
+    completionHandler: ^(NSDictionary *newURLs, NSError *error) {
+      nsresult rv = (error == nil) ? NS_OK : NS_ERROR_FAILURE;
+      callback->TrashAppFinished(rv);
+    }];
+
+  return NS_OK;
+
+  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
+}