diff --git a/content/html/document/src/nsHTMLContentSink.cpp b/content/html/document/src/nsHTMLContentSink.cpp
index 2ef3c91bb90c..d172df765033 100644
--- a/content/html/document/src/nsHTMLContentSink.cpp
+++ b/content/html/document/src/nsHTMLContentSink.cpp
@@ -129,9 +129,6 @@ class HTMLContentSink;
  * Don't bother adding new stuff in this file.
  */
 class HTMLContentSink : public nsContentSink,
-#ifdef DEBUG
-                        public nsIDebugDumpContent,
-#endif
                         public nsIHTMLContentSink
 {
 public:
@@ -165,11 +162,6 @@ public:
   NS_IMETHOD OpenContainer(ElementType aNodeType);
   NS_IMETHOD CloseContainer(ElementType aTag);
 
-#ifdef DEBUG
-  // nsIDebugDumpContent
-  NS_IMETHOD DumpContentModel();
-#endif
-
 protected:
   already_AddRefed<nsGenericHTMLElement>
   CreateContentObject(nsHTMLTag aNodeType);
@@ -1094,9 +1086,6 @@ NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLContentSink)
   NS_INTERFACE_TABLE_BEGIN
     NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIContentSink)
     NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIHTMLContentSink)
-#if DEBUG
-    NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIDebugDumpContent)
-#endif
   NS_INTERFACE_TABLE_END
 NS_INTERFACE_TABLE_TAIL_INHERITING(nsContentSink)
 
@@ -1655,40 +1644,3 @@ HTMLContentSink::IsScriptExecuting()
 {
   return IsScriptExecutingImpl();
 }
-
-#ifdef DEBUG
-/**
- *  This will dump content model into the output file.
- *
- *  @update  harishd 05/25/00
- *  @param
- *  @return  NS_OK all went well, error on failure
- */
-
-NS_IMETHODIMP
-HTMLContentSink::DumpContentModel()
-{
-  FILE* out = ::fopen("rtest_html.txt", "a");
-  if (out) {
-    if (mDocument) {
-      Element* root = mDocument->GetRootElement();
-      if (root) {
-        if (mDocumentURI) {
-          nsAutoCString buf;
-          mDocumentURI->GetSpec(buf);
-          fputs(buf.get(), out);
-        }
-
-        fputs(";", out);
-        root->DumpContent(out, 0, false);
-        fputs(";\n", out);
-      }
-    }
-
-    fclose(out);
-  }
-
-  return NS_OK;
-}
-#endif
-
diff --git a/parser/htmlparser/public/nsIParser.h b/parser/htmlparser/public/nsIParser.h
index 62ec3520bbc5..b5bfc469365a 100644
--- a/parser/htmlparser/public/nsIParser.h
+++ b/parser/htmlparser/public/nsIParser.h
@@ -58,23 +58,6 @@ enum eParserDocType {
 
 enum eStreamState {eNone,eOnStart,eOnDataAvail,eOnStop};
 
-/** 
- *  FOR DEBUG PURPOSE ONLY
- *
- *  Use this interface to query objects that contain content information.
- *  Ex. Parser can trigger dump content by querying the sink that has
- *      access to the content.
- *  
- *  @update  harishd 05/25/00
- */
-class nsIDebugDumpContent : public nsISupports {
-public:
-  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IDEBUG_DUMP_CONTENT_IID)
-  NS_IMETHOD DumpContentModel()=0;
-};
-
-NS_DEFINE_STATIC_IID_ACCESSOR(nsIDebugDumpContent, NS_IDEBUG_DUMP_CONTENT_IID)
-
 /**
  * This GECKO-INTERNAL interface is on track to being REMOVED (or refactored
  * to the point of being near-unrecognizable).
diff --git a/parser/htmlparser/src/nsParser.cpp b/parser/htmlparser/src/nsParser.cpp
index 106e33f26bf6..4cea5cc5aad4 100644
--- a/parser/htmlparser/src/nsParser.cpp
+++ b/parser/htmlparser/src/nsParser.cpp
@@ -162,10 +162,6 @@ void nsParser::Shutdown()
   NS_IF_RELEASE(sCharsetConverterManager);
 }
 
-#ifdef DEBUG
-static bool gDumpContent=false;
-#endif
-
 /**
  *  default constructor
  */
@@ -182,12 +178,6 @@ nsParser::~nsParser()
 void
 nsParser::Initialize(bool aConstructor)
 {
-#ifdef DEBUG
-  if (!gDumpContent) {
-    gDumpContent = PR_GetEnv("PARSER_DUMP_CONTENT") != nullptr;
-  }
-#endif
-
   if (aConstructor) {
     // Raw pointer
     mParserContext = 0;
@@ -215,20 +205,6 @@ nsParser::Initialize(bool aConstructor)
 void
 nsParser::Cleanup()
 {
-#ifdef DEBUG
-  if (gDumpContent) {
-    if (mSink) {
-      // Sink (HTMLContentSink at this time) supports nsIDebugDumpContent
-      // interface. We can get to the content model through the sink.
-      nsresult result = NS_OK;
-      nsCOMPtr<nsIDebugDumpContent> trigger = do_QueryInterface(mSink, &result);
-      if (NS_SUCCEEDED(result)) {
-        trigger->DumpContentModel();
-      }
-    }
-  }
-#endif
-
 #ifdef DEBUG
   if (mParserContext && mParserContext->mPrevContext) {
     NS_WARNING("Extra parser contexts still on the parser stack");