diff --git a/mozilla/content/html/document/src/nsHTMLFragmentContentSink.cpp b/mozilla/content/html/document/src/nsHTMLFragmentContentSink.cpp
index ae3ed89c782..2dab497e56e 100644
--- a/mozilla/content/html/document/src/nsHTMLFragmentContentSink.cpp
+++ b/mozilla/content/html/document/src/nsHTMLFragmentContentSink.cpp
@@ -707,6 +707,7 @@ nsHTMLFragmentContentSink::DidBuildContent()
 {
   if (!mAllContent) {
     FlushText();
+    DidBuildModel(); // Release our ref to the parser now.
     mProcessing = PR_FALSE;
   }
 
diff --git a/mozilla/parser/htmlparser/public/nsIFragmentContentSink.h b/mozilla/parser/htmlparser/public/nsIFragmentContentSink.h
index 364f41d5d9b..91f4e35fc9b 100644
--- a/mozilla/parser/htmlparser/public/nsIFragmentContentSink.h
+++ b/mozilla/parser/htmlparser/public/nsIFragmentContentSink.h
@@ -46,6 +46,12 @@ class nsIDocument;
  { 0xe9ea6afb, 0x92f3, 0x4270, \
  { 0xb2, 0x67, 0xd2, 0xe3, 0x8d, 0x0e, 0x95, 0x45 } }
 
+/**
+ * The fragment sink allows a client to parse a fragment of sink, possibly
+ * surrounded in context. Also see nsIParser::ParseFragment().
+ * Note: once you've parsed a fragment, the fragment sink must be re-set on
+ * the parser in order to parse another fragment.
+ */
 class nsIFragmentContentSink : public nsISupports {
 public:
   NS_DEFINE_STATIC_IID_ACCESSOR(NS_I_FRAGMENT_CONTENT_SINK_IID)