diff -r 000000000000 -r 6474c204b198 browser/components/feeds/test/unit/test_758990.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/feeds/test/unit/test_758990.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+function run_test() {
+  var success = false;
+  try {
+    var newURI = ios.newURI("feed:javascript:alert('hi');", null, null);
+  }
+  catch (e) {
+    success = e.result == Cr.NS_ERROR_MALFORMED_URI;
+  }
+  if (!success)
+    do_throw("We didn't throw NS_ERROR_MALFORMED_URI creating a feed:javascript: URI");
+
+  success = false;
+  try {
+    newURI = ios.newURI("feed:data:text/html,hi", null, null);
+  }
+  catch (e) {
+    success = e.result == Cr.NS_ERROR_MALFORMED_URI;
+  }
+  if (!success)
+    do_throw("We didn't throw NS_ERROR_MALFORMED_URI creating a feed:data: URI");
+
+  success = false;
+  try {
+    newURI = ios.newURI("pcast:javascript:alert('hi');", null, null);
+  }
+  catch (e) {
+    success = e.result == Cr.NS_ERROR_MALFORMED_URI;
+  }
+  if (!success)
+    do_throw("We didn't throw NS_ERROR_MALFORMED_URI creating a pcast:javascript: URI");
+
+  success = false;
+  try {
+    newURI = ios.newURI("pcast:data:text/html,hi", null, null);
+  }
+  catch (e) {
+    success = e.result == Cr.NS_ERROR_MALFORMED_URI;
+  }
+  if (!success)
+    do_throw("We didn't throw NS_ERROR_MALFORMED_URI creating a pcast:data: URI");
+
+}