--- a/editor/libeditor/EditorBase.h
+++ b/editor/libeditor/EditorBase.h
@@ -2,16 +2,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_EditorBase_h
 #define mozilla_EditorBase_h
 
 #include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc.
+#include "mozFlushType.h"               // for mozFlushType enum
 #include "mozilla/OwningNonNull.h"      // for OwningNonNull
 #include "mozilla/SelectionState.h"     // for RangeUpdater, etc.
 #include "mozilla/StyleSheet.h"   // for StyleSheet
 #include "mozilla/dom/Text.h"
 #include "nsCOMPtr.h"                   // for already_AddRefed, nsCOMPtr
 #include "nsCycleCollectionParticipant.h"
 #include "nsGkAtoms.h"
 #include "nsIEditor.h"                  // for nsIEditor::EDirection, etc.
@@ -935,16 +936,24 @@ public:
 
   /**
    * HideCaret() hides caret with nsCaret::AddForceHide() or may show carent
    * with nsCaret::RemoveForceHide().  This does NOT set visibility of
    * nsCaret.  Therefore, this is stateless.
    */
   void HideCaret(bool aHide);
 
+  void FlushFrames()
+  {
+    nsCOMPtr<nsIDocument> doc = GetDocument();
+    if (doc) {
+      doc->FlushPendingNotifications(Flush_Frames);
+    }
+  }
+
 protected:
   enum Tristate
   {
     eTriUnset,
     eTriFalse,
     eTriTrue
   };
 

--- a/editor/libeditor/HTMLEditorDataTransfer.cpp
+++ b/editor/libeditor/HTMLEditorDataTransfer.cpp
@@ -1656,16 +1656,19 @@ HTMLEditor::PasteAsCitedQuotation(const 
   // Try to set type=cite.  Ignore it if this fails.
   newNode->SetAttr(kNameSpaceID_None, nsGkAtoms::type,
                    NS_LITERAL_STRING("cite"), true);
 
   // Set the selection to the underneath the node we just inserted:
   rv = selection->Collapse(newNode, 0);
   NS_ENSURE_SUCCESS(rv, rv);
 
+  // Ensure that the inserted <blockquote> has a frame to make it IsEditable.
+  FlushFrames();
+
   return Paste(aSelectionType);
 }
 
 /**
  * Paste a plaintext quotation.
  */
 NS_IMETHODIMP
 HTMLEditor::PasteAsPlaintextQuotation(int32_t aSelectionType)
@@ -1712,16 +1715,17 @@ HTMLEditor::PasteAsPlaintextQuotation(in
   }
 
   return rv;
 }
 
 NS_IMETHODIMP
 HTMLEditor::InsertTextWithQuotations(const nsAString& aStringToInsert)
 {
+  AutoEditBatch beginBatching(this);
   // The whole operation should be undoable in one transaction:
   BeginTransaction();
 
   // We're going to loop over the string, collecting up a "hunk"
   // that's all the same type (quoted or not),
   // Whenever the quotedness changes (or we reach the string's end)
   // we will insert the hunk all at once, quoted or non.
 
@@ -1875,16 +1879,19 @@ HTMLEditor::InsertAsPlaintextQuotation(c
       newNode->SetAttr(kNameSpaceID_None, nsGkAtoms::style,
         NS_LITERAL_STRING("white-space: pre-wrap;"), true);
     }
 
     // and set the selection inside it:
     selection->Collapse(newNode, 0);
   }
 
+  // Ensure that the inserted <span> has a frame to make it IsEditable.
+  FlushFrames();
+
   if (aAddCites) {
     rv = TextEditor::InsertAsQuotation(aQuotedText, aNodeInserted);
   } else {
     rv = TextEditor::InsertText(aQuotedText);
   }
   // Note that if !aAddCites, aNodeInserted isn't set.
   // That's okay because the routines that use aAddCites
   // don't need to know the inserted node.
@@ -1958,16 +1965,19 @@ HTMLEditor::InsertAsCitedQuotation(const
 
   if (!aCitation.IsEmpty()) {
     newNode->SetAttr(kNameSpaceID_None, nsGkAtoms::cite, aCitation, true);
   }
 
   // Set the selection inside the blockquote so aQuotedText will go there:
   selection->Collapse(newNode, 0);
 
+  // Ensure that the inserted <blockquote> has a frame to make it IsEditable.
+  FlushFrames();
+
   if (aInsertHTML) {
     rv = LoadHTML(aQuotedText);
   } else {
     rv = InsertText(aQuotedText);  // XXX ignore charset
   }
 
   if (aNodeInserted && NS_SUCCEEDED(rv)) {
     *aNodeInserted = GetAsDOMNode(newNode);