diff --git a/dom/bluetooth/BluetoothService.cpp b/dom/bluetooth/BluetoothService.cpp
index b535872044fb..93bbd1077be3 100644
--- a/dom/bluetooth/BluetoothService.cpp
+++ b/dom/bluetooth/BluetoothService.cpp
@@ -195,7 +195,7 @@ class BluetoothService::StartupTask : public nsISettingsServiceCallback
 public:
   NS_DECL_ISUPPORTS
 
-  NS_IMETHOD Handle(const nsAString& aName, const jsval& aResult, JSContext* aCx)
+  NS_IMETHOD Handle(const nsAString& aName, const jsval& aResult)
   {
     MOZ_ASSERT(NS_IsMainThread());
 
@@ -213,7 +213,7 @@ public:
     return NS_OK;
   }
 
-  NS_IMETHOD HandleError(const nsAString& aName, JSContext* aCx)
+  NS_IMETHOD HandleError(const nsAString& aName)
   {
     NS_WARNING("Unable to get value for '" BLUETOOTH_ENABLED_SETTING "'");
     return NS_OK;
diff --git a/dom/interfaces/settings/nsISettingsService.idl b/dom/interfaces/settings/nsISettingsService.idl
index 77551dc8607a..e06739a059b6 100644
--- a/dom/interfaces/settings/nsISettingsService.idl
+++ b/dom/interfaces/settings/nsISettingsService.idl
@@ -4,12 +4,10 @@
 
 #include "domstubs.idl"
 
-[scriptable, uuid(83d67430-8516-11e1-b0c4-0800200c9a66)]
+[scriptable, uuid(aad47850-2e87-11e2-81c1-0800200c9a66)]
 interface nsISettingsServiceCallback : nsISupports
 {
-  [implicit_jscontext]
   void handle(in DOMString aName, in jsval aResult);
-  [implicit_jscontext]
   void handleError(in DOMString aErrorMessage);
 };
 
diff --git a/dom/src/geolocation/nsGeolocation.cpp b/dom/src/geolocation/nsGeolocation.cpp
index 014b4e7210ec..78d487a9e942 100644
--- a/dom/src/geolocation/nsGeolocation.cpp
+++ b/dom/src/geolocation/nsGeolocation.cpp
@@ -89,7 +89,7 @@ public:
     MOZ_COUNT_DTOR(GeolocationSettingsCallback);
   }
 
-  NS_IMETHOD Handle(const nsAString& aName, const jsval& aResult, JSContext* aCx)
+  NS_IMETHOD Handle(const nsAString& aName, const jsval& aResult)
   {
     MOZ_ASSERT(NS_IsMainThread());
 
@@ -103,7 +103,7 @@ public:
     return NS_OK;
   }
 
-  NS_IMETHOD HandleError(const nsAString& aName, JSContext* aCx)
+  NS_IMETHOD HandleError(const nsAString& aName)
   {
     NS_WARNING("Unable to get value for '" GEO_SETINGS_ENABLED "'");
 
diff --git a/dom/system/gonk/AutoMounterSetting.cpp b/dom/system/gonk/AutoMounterSetting.cpp
index 3a824a358cba..373f328a1973 100644
--- a/dom/system/gonk/AutoMounterSetting.cpp
+++ b/dom/system/gonk/AutoMounterSetting.cpp
@@ -35,7 +35,7 @@ public:
 
   SettingsServiceCallback() {}
 
-  NS_IMETHOD Handle(const nsAString &aName, const JS::Value &aResult, JSContext *aContext) {
+  NS_IMETHOD Handle(const nsAString &aName, const JS::Value &aResult) {
     if (JSVAL_IS_INT(aResult)) {
       int32_t mode = JSVAL_TO_INT(aResult);
       SetAutoMounterMode(mode);
@@ -43,7 +43,7 @@ public:
     return NS_OK;
   }
 
-  NS_IMETHOD HandleError(const nsAString &aName, JSContext *aContext) {
+  NS_IMETHOD HandleError(const nsAString &aName) {
     ERR("SettingsCallback::HandleError: %s\n", NS_LossyConvertUTF16toASCII(aName).get());
     return NS_OK;
   }
diff --git a/dom/system/gonk/GonkGPSGeolocationProvider.cpp b/dom/system/gonk/GonkGPSGeolocationProvider.cpp
index 3d7e552afde7..53da1a71d8f4 100644
--- a/dom/system/gonk/GonkGPSGeolocationProvider.cpp
+++ b/dom/system/gonk/GonkGPSGeolocationProvider.cpp
@@ -28,6 +28,7 @@
 #include "nsJSUtils.h"
 #include "nsServiceManagerUtils.h"
 #include "nsThreadUtils.h"
+#include "nsContentUtils.h"
 
 #ifdef AGPS_TYPE_INVALID
 #define AGPS_HAVE_DUAL_APN
@@ -659,10 +660,13 @@ GonkGPSGeolocationProvider::ReceiveDataCallList(nsIRILDataCallInfo** aDataCalls,
 
 NS_IMETHODIMP
 GonkGPSGeolocationProvider::Handle(const nsAString& aName,
-                                   const JS::Value& aResult,
-                                   JSContext* cx)
+                                   const JS::Value& aResult)
 {
   if (aName.EqualsLiteral("ril.supl.apn")) {
+    JSContext *cx = nsContentUtils::GetSafeJSContext();
+    NS_ENSURE_TRUE(cx, NS_OK);
+    JSAutoRequest ar(cx);
+    JSAutoCompartment ac(cx, JSVAL_TO_OBJECT(aResult));
     // When we get the APN, we attempt to call data_call_open of AGPS.
     if (aResult.isString()) {
       nsDependentJSString apn;
@@ -676,8 +680,7 @@ GonkGPSGeolocationProvider::Handle(const nsAString& aName,
 }
 
 NS_IMETHODIMP
-GonkGPSGeolocationProvider::HandleError(const nsAString& aErrorMessage,
-                                        JSContext* cx)
+GonkGPSGeolocationProvider::HandleError(const nsAString& aErrorMessage)
 {
   return NS_OK;
 }
diff --git a/dom/system/gonk/TimeZoneSettingObserver.cpp b/dom/system/gonk/TimeZoneSettingObserver.cpp
index d1c9443362e0..48cd78502137 100644
--- a/dom/system/gonk/TimeZoneSettingObserver.cpp
+++ b/dom/system/gonk/TimeZoneSettingObserver.cpp
@@ -20,6 +20,7 @@
 #include "nsString.h"
 #include "TimeZoneSettingObserver.h"
 #include "xpcpublic.h"
+#include "nsContentUtils.h"
 
 #undef LOG
 #define LOG(args...)  __android_log_print(ANDROID_LOG_INFO, "Time Zone Setting" , ## args)
@@ -50,7 +51,13 @@ public:
 
   TimeZoneSettingCb() {}
 
-  NS_IMETHOD Handle(const nsAString &aName, const JS::Value &aResult, JSContext *aContext) {
+  NS_IMETHOD Handle(const nsAString &aName, const JS::Value &aResult) {
+
+    JSContext *cx = nsContentUtils::GetSafeJSContext();
+    NS_ENSURE_TRUE(cx, NS_OK);
+    JSAutoRequest ar(cx);
+    JSAutoCompartment ac(cx, JSVAL_TO_OBJECT(aResult));
+
     // If we don't have time.timezone value in the settings, we need
     // to initialize the settings based on the current system timezone
     // to make settings consistent with system. This usually happens
@@ -59,7 +66,7 @@ public:
       // Get the current system timezone and convert it to a JS string.
       nsCString curTimezone = hal::GetTimezone();
       NS_ConvertUTF8toUTF16 utf16Str(curTimezone);
-      JSString *jsStr = JS_NewUCStringCopyN(aContext, utf16Str.get(), utf16Str.Length());
+      JSString *jsStr = JS_NewUCStringCopyN(cx, utf16Str.get(), utf16Str.Length());
 
       // Set the settings based on the current system timezone.
       nsCOMPtr<nsISettingsServiceLock> lock;
@@ -76,13 +83,13 @@ public:
 
     // Set the system timezone based on the current settings.
     if (aResult.isString()) {
-      return TimeZoneSettingObserver::SetTimeZone(aResult, aContext);
+      return TimeZoneSettingObserver::SetTimeZone(aResult, cx);
     }
 
     return NS_OK;
   }
 
-  NS_IMETHOD HandleError(const nsAString &aName, JSContext *aContext) {
+  NS_IMETHOD HandleError(const nsAString &aName) {
     ERR("TimeZoneSettingCb::HandleError: %s\n", NS_LossyConvertUTF16toASCII(aName).get());
     return NS_OK;
   }
diff --git a/xpcom/tests/TestSettingsAPI.cpp b/xpcom/tests/TestSettingsAPI.cpp
index 178eba50380a..de6241bda9db 100644
--- a/xpcom/tests/TestSettingsAPI.cpp
+++ b/xpcom/tests/TestSettingsAPI.cpp
@@ -58,7 +58,7 @@ public:
 
   SettingsServiceCallback() { }
 
-  NS_IMETHOD Handle(const nsAString &name, const JS::Value &result, JSContext *cx) {
+  NS_IMETHOD Handle(const nsAString &name, const JS::Value &result) {
     if (callbackCount == 9) {
       CHECK(JSVAL_IS_BOOLEAN(result));
       CHECK(JSVAL_TO_BOOLEAN(result) == true);
@@ -87,7 +87,7 @@ public:
     return NS_OK;
   };
 
-  NS_IMETHOD HandleError(const nsAString &name, JSContext *cx) {
+  NS_IMETHOD HandleError(const nsAString &name) {
     fprintf(stderr, "HANDLE Error! %s\n", NS_LossyConvertUTF16toASCII(name).get());
     errors++;
     return NS_OK;