diff --git a/parser/html/nsHtml5Parser.cpp b/parser/html/nsHtml5Parser.cpp
index 103a0883cbf2..75477edad052 100644
--- a/parser/html/nsHtml5Parser.cpp
+++ b/parser/html/nsHtml5Parser.cpp
@@ -587,7 +587,7 @@ nsHtml5Parser::IsScriptCreated()
 void
 nsHtml5Parser::ParseUntilBlocked()
 {
-  if (mBlocked || mExecutor->IsComplete() || mExecutor->IsBroken()) {
+  if (mBlocked || mExecutor->IsComplete() || NS_FAILED(mExecutor->IsBroken())) {
     return;
   }
   NS_ASSERTION(mExecutor->HasStarted(), "Bad life cycle.");
diff --git a/parser/html/nsHtml5StreamParser.cpp b/parser/html/nsHtml5StreamParser.cpp
index 3a47d60587ed..cf81d545fa8b 100644
--- a/parser/html/nsHtml5StreamParser.cpp
+++ b/parser/html/nsHtml5StreamParser.cpp
@@ -1412,7 +1412,7 @@ nsHtml5StreamParser::ContinueAfterScripts(nsHtml5Tokenizer* aTokenizer,
   NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
   NS_ASSERTION(!(mMode == VIEW_SOURCE_HTML || mMode == VIEW_SOURCE_XML),
       "ContinueAfterScripts called in view source mode!");
-  if (mExecutor->IsBroken()) {
+  if (NS_FAILED(mExecutor->IsBroken())) {
     return;
   }
   #ifdef DEBUG
diff --git a/parser/html/nsHtml5TreeOpExecutor.cpp b/parser/html/nsHtml5TreeOpExecutor.cpp
index c7b4a4f3130f..3af7fdc3dad0 100644
--- a/parser/html/nsHtml5TreeOpExecutor.cpp
+++ b/parser/html/nsHtml5TreeOpExecutor.cpp
@@ -146,7 +146,7 @@ nsHtml5TreeOpExecutor::DidBuildModel(bool aTerminated)
   // This comes from nsXMLContentSink and nsHTMLContentSink
   // If this parser has been marked as broken, treat the end of parse as
   // forced termination.
-  DidBuildModelImpl(aTerminated || IsBroken());
+  DidBuildModelImpl(aTerminated || NS_FAILED(IsBroken()));
 
   if (!mLayoutStarted) {
     // We never saw the body, and layout never got started. Force
@@ -480,7 +480,7 @@ nsHtml5TreeOpExecutor::RunFlushLoop()
       return;
     }
 
-    if (IsBroken()) {
+    if (NS_FAILED(IsBroken())) {
       return;
     }
 
@@ -936,7 +936,7 @@ nsHtml5TreeOpExecutor::Reset()
   mFlushState = eNotFlushing;
   mRunFlushLoopOnStack = false;
   MOZ_ASSERT(!mReadingFromStage);
-  MOZ_ASSERT(!mBroken);
+  MOZ_ASSERT(NS_SUCCEEDED(mBroken));
 }
 
 void