--- a/dom/events/EventStateManager.cpp
+++ b/dom/events/EventStateManager.cpp
@@ -849,19 +849,21 @@ EventStateManager::HandleQueryContentEve
     case eQueryTextRect:
     case eQueryEditorRect:
       if (!IsTargetCrossProcess(aEvent)) {
         break;
       }
       // Will not be handled locally, remote the event
       GetCrossProcessTarget()->HandleQueryContentEvent(*aEvent);
       return;
-    // Following events have not been supported in e10s mode yet.
     case eQueryContentState:
     case eQuerySelectionAsTransferable:
+      aEvent->mIsContentProcess = IsRemoteTarget(GetFocusedContent());
+      break;
+    // Following events have not been supported in e10s mode yet.
     case eQueryCharacterAtPoint:
     case eQueryDOMWidgetHittest:
     case eQueryTextRectArray:
       break;
     default:
       return;
   }
 

--- a/widget/TextEvents.h
+++ b/widget/TextEvents.h
@@ -747,16 +747,17 @@ public:
   {
     NS_ASSERTION(mMessage == eQuerySelectedText ||
                  mMessage == eQueryCaretRect ||
                  mMessage == eQueryTextRect,
                  "not querying selection or text rect");
     return mReply.mWritingMode;
   }
 
+  bool mIsContentProcess;
   bool mSucceeded;
   bool mUseNativeLineBreak;
   bool mWithFontRanges;
   struct Input final
   {
     uint32_t EndOffset() const
     {
       CheckedInt<uint32_t> endOffset =