diff --git a/editor/base/nsHTMLEditor.cpp b/editor/base/nsHTMLEditor.cpp
index 54c4df2f8b1d..3b4d0c819be8 100644
--- a/editor/base/nsHTMLEditor.cpp
+++ b/editor/base/nsHTMLEditor.cpp
@@ -4687,7 +4687,13 @@ nsHTMLEditor::InsertAsPlaintextQuotation(const nsString& aQuotedText,
       // Do this after the insertion, so that 
       nsCOMPtr<nsIDOMElement> preElement (do_QueryInterface(preNode));
       if (preElement)
-        preElement->SetAttribute(NS_ConvertASCIItoUCS2("_moz_quote"), NS_ConvertASCIItoUCS2("true"));
+      {
+        preElement->SetAttribute(NS_ConvertASCIItoUCS2("_moz_quote"),
+                                 NS_ConvertASCIItoUCS2("true"));
+        // set style to not have unwanted vertical margins
+        preElement->SetAttribute(NS_ConvertASCIItoUCS2("style"),
+                                 NS_ConvertASCIItoUCS2("margin: 0 0 0 0px;"));
+      }
 
       // and set the selection inside it:
       selection->Collapse(preNode, 0);
diff --git a/editor/libeditor/html/nsHTMLEditor.cpp b/editor/libeditor/html/nsHTMLEditor.cpp
index 54c4df2f8b1d..3b4d0c819be8 100644
--- a/editor/libeditor/html/nsHTMLEditor.cpp
+++ b/editor/libeditor/html/nsHTMLEditor.cpp
@@ -4687,7 +4687,13 @@ nsHTMLEditor::InsertAsPlaintextQuotation(const nsString& aQuotedText,
       // Do this after the insertion, so that 
       nsCOMPtr<nsIDOMElement> preElement (do_QueryInterface(preNode));
       if (preElement)
-        preElement->SetAttribute(NS_ConvertASCIItoUCS2("_moz_quote"), NS_ConvertASCIItoUCS2("true"));
+      {
+        preElement->SetAttribute(NS_ConvertASCIItoUCS2("_moz_quote"),
+                                 NS_ConvertASCIItoUCS2("true"));
+        // set style to not have unwanted vertical margins
+        preElement->SetAttribute(NS_ConvertASCIItoUCS2("style"),
+                                 NS_ConvertASCIItoUCS2("margin: 0 0 0 0px;"));
+      }
 
       // and set the selection inside it:
       selection->Collapse(preNode, 0);