diff --git a/layout/reftests/bugs/306630-1-ref.html b/layout/reftests/bugs/306630-1-ref.html
new file mode 100644
index 000000000000..770bc8719c41
--- /dev/null
+++ b/layout/reftests/bugs/306630-1-ref.html
@@ -0,0 +1,4 @@
+<frameset rows="170,*">
+<frame src="data:text/html,frame1">
+<frame src="data:text/html,frame2">
+</frameset>
diff --git a/layout/reftests/bugs/306630-1.html b/layout/reftests/bugs/306630-1.html
new file mode 100644
index 000000000000..a64d6cfdbd3e
--- /dev/null
+++ b/layout/reftests/bugs/306630-1.html
@@ -0,0 +1,4 @@
+<frameset rows="170,*">
+<frame src="javascript:'frame1'">
+<frame src="javascript:'frame2'">
+</frameset>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index cd8efb7f3ead..e7b498d0208d 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -94,6 +94,7 @@ fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 273681-1.html 273681-1-ref.html # bug 3
 == 300691-1d.html 300691-1-ref.html
 == 300691-1e.html 300691-1-ref.html
 == 300691-1f.html 300691-1-ref.html
+== 306630-1.html 306630-1-ref.html
 == 306660-1.html 306660-1-ref.html
 == 306660-2.html 306660-2-ref.html
 == 306660-3.html 306660-3-ref.html