Fix touch control not working in Firefox.

res/app/components/stf/util/vendor/vendor-util.js

@@ -0,0 +1,15 @@
+module.exports = function VendorUtilFactory() {
+  var vendorUtil = {}
+
+  vendorUtil.style = function(props) {
+    var testee = document.createElement('span')
+    for (var i = 0, l = props.length; i < l; ++i) {
+      if (testee.style[props[i]] !== void 0) {
+        return props[i]
+      }
+    }
+    return props[0]
+  }
+
+  return vendorUtil
+}