--- a/b2g/config/emulator-ics/sources.xml
+++ b/b2g/config/emulator-ics/sources.xml
@@ -14,17 +14,17 @@
   <!--original fetch url was git://github.com/apitrace/-->
   <remote fetch="https://git.mozilla.org/external/apitrace" name="apitrace"/>
   <default remote="caf" revision="refs/tags/android-4.0.4_r2.1" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="0d616942c300d9fb142483210f1dda9096c9a9fc">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="platform_hardware_ril" path="hardware/ril" remote="b2g" revision="cd88d860656c31c7da7bb310d6a160d0011b0961"/>
   <project name="platform_external_qemu" path="external/qemu" remote="b2g" revision="bf9aaf39dd5a6491925a022db167c460f8207d34"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="dd924f92906085b831bf1cbbc7484d3c043d613c"/>

--- a/b2g/config/emulator-jb/sources.xml
+++ b/b2g/config/emulator-jb/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="cc67f31dc638c0b7edba3cf7e3d87cadf0ed52bf">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <!-- Stock Android things -->
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.1" path="prebuilts/clang/linux-x86/3.1" revision="5c45f43419d5582949284eee9cef0c43d866e03b"/>
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.2" path="prebuilts/clang/linux-x86/3.2" revision="3748b4168e7bd8d46457d4b6786003bc6a5223ce"/>

--- a/b2g/config/emulator-kk/sources.xml
+++ b/b2g/config/emulator-kk/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was git://codeaurora.org/-->
   <remote fetch="https://git.mozilla.org/external/caf" name="caf"/>
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="276ce45e78b09c4a4ee643646f691d22804754c1">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="891e5069c0ad330d8191bf8c7b879c814258c89f"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>

--- a/b2g/config/emulator/sources.xml
+++ b/b2g/config/emulator/sources.xml
@@ -14,17 +14,17 @@
   <!--original fetch url was git://github.com/apitrace/-->
   <remote fetch="https://git.mozilla.org/external/apitrace" name="apitrace"/>
   <default remote="caf" revision="refs/tags/android-4.0.4_r2.1" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="0d616942c300d9fb142483210f1dda9096c9a9fc">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="platform_hardware_ril" path="hardware/ril" remote="b2g" revision="cd88d860656c31c7da7bb310d6a160d0011b0961"/>
   <project name="platform_external_qemu" path="external/qemu" remote="b2g" revision="bf9aaf39dd5a6491925a022db167c460f8207d34"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="dd924f92906085b831bf1cbbc7484d3c043d613c"/>

--- a/b2g/config/flame/sources.xml
+++ b/b2g/config/flame/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="cc67f31dc638c0b7edba3cf7e3d87cadf0ed52bf">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="librecovery" path="librecovery" remote="b2g" revision="891e5069c0ad330d8191bf8c7b879c814258c89f"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <!-- Stock Android things -->
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.1" path="prebuilts/clang/linux-x86/3.1" revision="e95b4ce22c825da44d14299e1190ea39a5260bde"/>
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.2" path="prebuilts/clang/linux-x86/3.2" revision="471afab478649078ad7c75ec6b252481a59e19b8"/>

--- a/b2g/config/gaia.json
+++ b/b2g/config/gaia.json
@@ -1,9 +1,9 @@
 {
     "git": {
         "git_revision": "", 
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "190172ac413ab6476a6d7df3999950ec756f96a4", 
+    "revision": "4d2c0a0848326ad805ccc89f0a3893d35f90a9ef", 
     "repo_path": "/integration/gaia-central"
 }

--- a/b2g/config/hamachi/sources.xml
+++ b/b2g/config/hamachi/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was git://github.com/apitrace/-->
   <remote fetch="https://git.mozilla.org/external/apitrace" name="apitrace"/>
   <default remote="caf" revision="b2g/ics_strawberry" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="0d616942c300d9fb142483210f1dda9096c9a9fc">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="891e5069c0ad330d8191bf8c7b879c814258c89f"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="6426040f1be4a844082c9769171ce7f5341a5528"/>
   <project name="platform/bionic" path="bionic" revision="d2eb6c7b6e1bc7643c17df2d9d9bcb1704d0b9ab"/>

--- a/b2g/config/helix/sources.xml
+++ b/b2g/config/helix/sources.xml
@@ -10,17 +10,17 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <default remote="caf" revision="b2g/ics_strawberry" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="0d616942c300d9fb142483210f1dda9096c9a9fc">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="891e5069c0ad330d8191bf8c7b879c814258c89f"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="gonk-patches" path="patches" remote="b2g" revision="223a2421006e8f5da33f516f6891c87cae86b0f6"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="6426040f1be4a844082c9769171ce7f5341a5528"/>
   <project name="platform/bionic" path="bionic" revision="d2eb6c7b6e1bc7643c17df2d9d9bcb1704d0b9ab"/>

--- a/b2g/config/nexus-4/sources.xml
+++ b/b2g/config/nexus-4/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
   <project name="platform_build" path="build" remote="b2g" revision="cc67f31dc638c0b7edba3cf7e3d87cadf0ed52bf">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="fake-libdvm" path="dalvik" remote="b2g" revision="d50ae982b19f42f0b66d08b9eb306be81687869f"/>
-  <project name="gaia" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <project name="valgrind" path="external/valgrind" remote="b2g" revision="daa61633c32b9606f58799a3186395fd2bbb8d8c"/>
   <project name="vex" path="external/VEX" remote="b2g" revision="47f031c320888fe9f3e656602588565b52d43010"/>
   <!-- Stock Android things -->
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.1" path="prebuilts/clang/linux-x86/3.1" revision="5c45f43419d5582949284eee9cef0c43d866e03b"/>
   <project groups="linux" name="platform/prebuilts/clang/linux-x86/3.2" path="prebuilts/clang/linux-x86/3.2" revision="3748b4168e7bd8d46457d4b6786003bc6a5223ce"/>

--- a/b2g/config/wasabi/sources.xml
+++ b/b2g/config/wasabi/sources.xml
@@ -12,17 +12,17 @@
   <!--original fetch url was git://github.com/apitrace/-->
   <remote fetch="https://git.mozilla.org/external/apitrace" name="apitrace"/>
   <default remote="caf" revision="ics_chocolate_rb4.2" sync-j="4"/>
   <!-- Gonk specific things and forks -->
   <project name="platform_build" path="build" remote="b2g" revision="0d616942c300d9fb142483210f1dda9096c9a9fc">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="fake-dalvik" path="dalvik" remote="b2g" revision="ca1f327d5acc198bb4be62fa51db2c039032c9ce"/>
-  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="dde24450450514039bad6d8ab4fcb7e5d4d44e03"/>
+  <project name="gaia.git" path="gaia" remote="mozillaorg" revision="0f9f11d0a6dadb3ea27160204bbe911c1ad69a6f"/>
   <project name="gonk-misc" path="gonk-misc" remote="b2g" revision="230f11aff069d90d20fc2dc63b48e9ae3d4bdcd1"/>
   <project name="rilproxy" path="rilproxy" remote="b2g" revision="827214fcf38d6569aeb5c6d6f31cb296d1f09272"/>
   <project name="librecovery" path="librecovery" remote="b2g" revision="891e5069c0ad330d8191bf8c7b879c814258c89f"/>
   <project name="moztt" path="external/moztt" remote="b2g" revision="dc5ca96695cab87b4c2fcd7c9f046ae3415a70a5"/>
   <project name="apitrace" path="external/apitrace" remote="apitrace" revision="ee6e7320bb83409ebd4685fbd87a8ae033704182"/>
   <project name="gonk-patches" path="patches" remote="b2g" revision="223a2421006e8f5da33f516f6891c87cae86b0f6"/>
   <!-- Stock Android things -->
   <project name="platform/abi/cpp" path="abi/cpp" revision="6426040f1be4a844082c9769171ce7f5341a5528"/>

--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -977,28 +977,25 @@ ContentParent::CreateBrowserOrApp(const 
         // Check that the process is still alive and set its priority.
         // Hopefully the process won't die after this point, if this call
         // succeeds.
         if (!p->SetPriorityAndCheckIsAlive(initialPriority)) {
             p = nullptr;
         }
     }
 
+    bool reused = !!p;
+    bool tookPreallocated = false;
     if (!p) {
         p = MaybeTakePreallocatedAppProcess(manifestURL,
                                             initialPriority);
-        if (!p) {
-#ifdef MOZ_NUWA_PROCESS
-            if (Preferences::GetBool("dom.ipc.processPrelaunch.enabled",
-                                     false)) {
-                // Returning nullptr from here so the frame loader will retry
-                // later when we have a spare process.
-                return nullptr;
-            }
-#endif
+        tookPreallocated = !!p;
+        if (!tookPreallocated) {
+            // XXXkhuey Nuwa wants the frame loader to try again later, but the
+            // frame loader is really not set up to do that ...
             NS_WARNING("Unable to use pre-allocated app process");
             p = new ContentParent(ownApp,
                                   /* aOpener = */ nullptr,
                                   /* isForBrowserElement = */ false,
                                   /* isForPreallocated = */ false,
                                   initialPriority);
             p->Init();
         }
@@ -1012,16 +1009,39 @@ ContentParent::CreateBrowserOrApp(const 
     PBrowserParent* browser = p->SendPBrowserConstructor(
         // DeallocPBrowserParent() releases this ref.
         nsRefPtr<TabParent>(tp).forget().take(),
         aContext.AsIPCTabContext(),
         chromeFlags,
         p->ChildID(),
         p->IsForApp(),
         p->IsForBrowser());
+    if (!browser) {
+        // We failed to actually start the PBrowser.  This can happen if the
+        // other process has already died.
+        if (!reused) {
+            // Don't leave a broken ContentParent in the hashtable.
+            p->KillHard();
+            sAppContentParents->Remove(manifestURL);
+            p = nullptr;
+        }
+
+        // If we took the preallocated process and it was already dead, try
+        // again with a non-preallocated process.  We can be sure this won't
+        // loop forever, because the next time through there will be no
+        // preallocated process to take.
+        if (tookPreallocated) {
+          return ContentParent::CreateBrowserOrApp(aContext,
+                                                   aFrameElement,
+                                                   aOpenerContentParent);
+        }
+
+        // Otherwise just give up.
+        return nullptr;
+    }
 
     p->MaybeTakeCPUWakeLock(aFrameElement);
 
     return static_cast<TabParent*>(browser);
 }
 
 void
 ContentParent::GetAll(nsTArray<ContentParent*>& aArray)