diff --git a/parser/html/nsHtml5Highlighter.cpp b/parser/html/nsHtml5Highlighter.cpp
index 941b1f7f242d..8384b392828f 100644
--- a/parser/html/nsHtml5Highlighter.cpp
+++ b/parser/html/nsHtml5Highlighter.cpp
@@ -334,6 +334,7 @@ nsHtml5Highlighter::Transition(PRInt32 aState, bool aReconsume, PRInt32 aPos)
break;
// most comment states are omitted, because they don't matter to
// highlighting
+ case NS_HTML5TOKENIZER_COMMENT_START:
case NS_HTML5TOKENIZER_COMMENT_END:
case NS_HTML5TOKENIZER_COMMENT_END_BANG:
case NS_HTML5TOKENIZER_COMMENT_START_DASH:
diff --git a/parser/htmlparser/tests/reftest/bug704667-1-ref.html b/parser/htmlparser/tests/reftest/bug704667-1-ref.html
new file mode 100644
index 000000000000..a1bc098fd60d
--- /dev/null
+++ b/parser/htmlparser/tests/reftest/bug704667-1-ref.html
@@ -0,0 +1 @@
+
diff --git a/parser/htmlparser/tests/reftest/bug704667-1.html b/parser/htmlparser/tests/reftest/bug704667-1.html
new file mode 100644
index 000000000000..553c62b30984
--- /dev/null
+++ b/parser/htmlparser/tests/reftest/bug704667-1.html
@@ -0,0 +1 @@
+
diff --git a/parser/htmlparser/tests/reftest/reftest.list b/parser/htmlparser/tests/reftest/reftest.list
index 664131c421fe..80c010fd7561 100644
--- a/parser/htmlparser/tests/reftest/reftest.list
+++ b/parser/htmlparser/tests/reftest/reftest.list
@@ -16,3 +16,4 @@ fails-if(/^Windows\x20NT\x206\.1/.test(http.oscpu)&&!layersGPUAccelerated) == vi
== bug696651-1.html bug696651-1-ref.html
== bug696651-2.html bug696651-2-ref.html
== view-source:bug700260-1.html view-source:bug700260-1-ref.html
+== view-source:bug704667-1.html bug704667-1-ref.html