fix style.sheet.rules is undefined on firefox

package.json

@@ -94,7 +94,7 @@
         "c9.ide.pubsub": "#92ec19ed3a",
         "c9.ide.readonly": "#f6f07bbe42",
         "c9.ide.recentfiles": "#7c099abf40",
-        "c9.ide.remote": "#f531d62cfb",
+        "c9.ide.remote": "#e00a2f444f",
         "c9.ide.run": "#d07c872ee1",
         "c9.ide.run.build": "#915e48b363",
         "c9.ide.run.debug.xdebug": "#b91d23f48b",