diff --git a/dom/ipc/ProcessPriorityManager.cpp b/dom/ipc/ProcessPriorityManager.cpp
index 424cbc603dd1..a781ad14577b 100644
--- a/dom/ipc/ProcessPriorityManager.cpp
+++ b/dom/ipc/ProcessPriorityManager.cpp
@@ -541,7 +541,7 @@ ProcessPriorityManager::SetIsForeground()
 
   mProcessPriority = foregroundPriority;
   LOG("Setting priority to %s.", ProcessPriorityToString(mProcessPriority));
-  hal::SetProcessPriority(getpid(), PROCESS_PRIORITY_FOREGROUND);
+  hal::SetProcessPriority(getpid(), mProcessPriority);
 }
 
 void
diff --git a/hal/HalTypes.h b/hal/HalTypes.h
index c080260e89c6..970f35d89074 100644
--- a/hal/HalTypes.h
+++ b/hal/HalTypes.h
@@ -13,7 +13,9 @@ namespace mozilla {
 namespace hal {
 
 /**
- * XXX
+ * These constants specify special values for content process IDs.  You can get
+ * a content process ID by calling ContentChild::GetID() or
+ * ContentParent::GetChildID().
  */
 const uint64_t CONTENT_PROCESS_ID_UNKNOWN = uint64_t(-1);
 const uint64_t CONTENT_PROCESS_ID_MAIN = 0;