--- a/build/mobile/devicemanager.py
+++ b/build/mobile/devicemanager.py
@@ -341,34 +341,17 @@ class DeviceManager:
   # Either we will have /tests/fennec or /tests/firefox but we will never have
   # both.  Return the one that exists
   # TODO: ensure we can support org.mozilla.firefox
   # external function
   # returns:
   #  success: path for app root
   #  failure: None
   def getAppRoot(self):
-    devroot = self.getDeviceRoot()
-    if (devroot == None):
-      return None
-
-    if (self.dirExists(devroot + '/fennec')):
-      return devroot + '/fennec'
-    elif (self.dirExists(devroot + '/firefox')):
-      return devroot + '/firefox'
-    elif (self.dirExsts('/data/data/org.mozilla.fennec')):
-      return 'org.mozilla.fennec'
-    elif (self.dirExists('/data/data/org.mozilla.firefox')):
-      return 'org.mozilla.firefox'
-    elif (self.dirExists('/data/data/org.mozilla.fennec_aurora')):
-      return 'org.mozilla.fennec_aurora'
-    elif (self.dirExists('/data/data/org.mozilla.firefox_beta')):
-      return 'org.mozilla.firefox_beta'
-
-    # Failure (either not installed or not a recognized platform)
+    assert 0 == 1
     return None
 
   # Gets the directory location on the device for a specific test type
   # Type is one of: xpcshell|reftest|mochitest
   # external function
   # returns:
   #  success: path for test root
   #  failure: None

--- a/build/mobile/devicemanagerADB.py
+++ b/build/mobile/devicemanagerADB.py
@@ -421,25 +421,24 @@ class DeviceManagerADB(DeviceManager):
 
   # Either we will have /tests/fennec or /tests/firefox but we will never have
   # both.  Return the one that exists
   # TODO: ensure we can support org.mozilla.firefox
   # external function
   # returns:
   #  success: path for app root
   #  failure: None
-  def getAppRoot(self):
+  def getAppRoot(self, packageName):
     devroot = self.getDeviceRoot()
     if (devroot == None):
       return None
 
-    if (self.dirExists(devroot + '/fennec')):
-      return devroot + '/fennec'
-    elif (self.dirExists(devroot + '/firefox')):
-      return devroot + '/firefox'
+    if (packageName and self.dirExists('/data/data/' + packageName)):
+      self.packageName = packageName
+      return '/data/data/' + packageName
     elif (self.packageName and self.dirExists('/data/data/' + self.packageName)):
       return '/data/data/' + self.packageName
 
     # Failure (either not installed or not a recognized platform)
     print "devicemanagerADB: getAppRoot failed"
     return None
 
   # Gets the directory location on the device for a specific test type

--- a/build/mobile/devicemanagerSUT.py
+++ b/build/mobile/devicemanagerSUT.py
@@ -853,16 +853,25 @@ class DeviceManagerSUT(DeviceManager):
     deviceRoot = self.stripPrompt(data).strip('\n') + '/tests'
 
     if (not self.dirExists(deviceRoot)):
       if (self.mkDir(deviceRoot) == None):
         return None
 
     return deviceRoot
 
+  def getAppRoot(self, packageName):
+    try:
+      data = self.verifySendCMD(['getapproot '+packageName])
+    except:
+      return None
+  
+    appRoot = self.stripPrompt(data).strip('\n')
+    return appRoot
+
   # external function
   # returns:
   #  success: output of unzip command
   #  failure: None
   def unpackFile(self, filename):
     devroot = self.getDeviceRoot()
     if (devroot == None):
       return None

--- a/build/mobile/sutagent/android/DoCommand.java
+++ b/build/mobile/sutagent/android/DoCommand.java
@@ -132,17 +132,17 @@ public class DoCommand {
 
     String    currentDir = "/";
     String    sErrorPrefix = "##AGENT-WARNING## ";
     boolean bTraceOn = false;
 
     String ffxProvider = "org.mozilla.ffxcp";
     String fenProvider = "org.mozilla.fencp";
 
-    private final String prgVersion = "SUTAgentAndroid Version 1.03";
+    private final String prgVersion = "SUTAgentAndroid Version 1.04";
 
     public enum Command
         {
         RUN ("run"),
         EXEC ("exec"),
         ENVRUN ("envrun"),
         KILL ("kill"),
         PS ("ps"),
@@ -1280,17 +1280,17 @@ private void CancelNotification()
         String sRet = sErrorPrefix + " internal error [no context]";
         Context ctx = contextWrapper.getApplicationContext();
 
         if (ctx != null)
             {
             try {
                 Context appCtx = ctx.createPackageContext(AppName, 0);
                 ContextWrapper appCtxW = new ContextWrapper(appCtx);
-                sRet = appCtxW.getPackageResourcePath();
+                sRet = appCtxW.getApplicationInfo().dataDir;
                 appCtxW = null;
                 appCtx = null;
                 ctx = null;
                 System.gc();
                 }
             catch (NameNotFoundException e)
                 {
                 e.printStackTrace();

--- a/testing/xpcshell/remotexpcshelltests.py
+++ b/testing/xpcshell/remotexpcshelltests.py
@@ -32,16 +32,17 @@
 # decision by deleting the provisions above and replace them with the notice
 # and other provisions required by the GPL or the LGPL. If you do not delete
 # the provisions above, a recipient may use your version of this file under
 # the terms of any one of the MPL, the GPL or the LGPL.
 #
 # ***** END LICENSE BLOCK ***** */
 
 import re, sys, os
+import subprocess
 import runxpcshelltests as xpcshell
 from automationutils import *
 import devicemanager, devicemanagerADB, devicemanagerSUT
 
 # A specialization of XPCShellTests that runs tests on an Android device
 # via devicemanager.
 class XPCShellRemote(xpcshell.XPCShellTests, object):
 
@@ -61,16 +62,32 @@ class XPCShellRemote(xpcshell.XPCShellTe
         self.remoteComponentsDir = self.remoteJoin(self.remoteTestRoot, "c")
         self.profileDir = self.remoteJoin(self.remoteTestRoot, "p")
         if options.setup:
           self.setupUtilities()
           self.setupTestDir()
         self.remoteAPK = self.remoteJoin(self.remoteBinDir, os.path.basename(options.localAPK))
         self.remoteDebugger = options.debugger
         self.remoteDebuggerArgs = options.debuggerArgs  
+        self.setAppRoot()
+
+    def setAppRoot(self):
+        # Determine the application root directory associated with the package 
+        # name used by the Fennec APK.
+        self.appRoot = None
+        packageName = None
+        if self.options.localAPK:
+          try:
+            packageName = subprocess.check_output(["unzip", "-p", self.options.localAPK, "package-name.txt"])
+            if packageName:
+              self.appRoot = self.device.getAppRoot(packageName.strip())
+          except Exception as detail:
+            print "unable to determine app root: " + detail
+            pass
+        return None
 
     def remoteJoin(self, path1, path2):
         joined = os.path.join(path1, path2)
         joined = joined.replace('\\', '/')
         return joined
 
     def remoteForLocal(self, local):
         for mapping in self.pathMapping:
@@ -198,19 +215,19 @@ class XPCShellRemote(xpcshell.XPCShellTe
             cmd[index] = part
           index = index + 1
 
         xpcshell = self.remoteJoin(self.remoteBinDir, "xpcshell")
 
         shellArgs = "cd "+self.remoteHere
         shellArgs += "; LD_LIBRARY_PATH="+self.remoteBinDir
         shellArgs += "; export CACHE_PATH="+self.remoteBinDir
-        if (self.device.getAppRoot()):
+        if (self.appRoot):
           # xpcshell still runs without GRE_HOME; it may not be necessary
-          shellArgs += "; export GRE_HOME="+self.device.getAppRoot()
+          shellArgs += "; export GRE_HOME="+self.appRoot
         shellArgs += "; export XPCSHELL_TEST_PROFILE_DIR="+self.profileDir
         shellArgs += "; "+xpcshell+" "
         shellArgs += " ".join(cmd[1:])
 
         if self.verbose:
           self.log.info(shellArgs)
 
         # If the adb version of devicemanager is used and the arguments passed