work around older firefox handling of the "properties" property on HT…

…MLElement prototype

src/micro/properties.html

@@ -58,42 +58,6 @@
 
   Polymer.Base._addFeature({
 
-    /*
-     * Object containing property configuration data, where keys are property
-     * names and values are descriptor objects that configure Polymer features
-     * for the property.  Valid fields in the property descriptor object are
-     * as follows:
-     *
-     * * `type` - used to determine how to deserialize attribute value strings
-     *    to JS properties.  By convention, this field takes a JS constructor
-     *    for the type, such as `String` or `Boolean`.
-     * * `value` - default value for the property.  The value may either be a
-     *    primitive value, or a function that returns a value (which should be
-     *    used for initializing Objects and Arrays to avoid shared objects on
-     *    instances).
-     * * `notify` - when `true`, configures the property to fire a non-bubbling
-     *    event called `<property>-changed` for each change to the property.
-     *    Elements that have enabled two-way binding to the property use this
-     *    event to observe changes.
-     * * `readOnly` - when `true` configures the property to have a getter, but
-     *    no setter. To set a read-only property, use the private setter method
-     *    `_set_<property>(value)`.
-     * * `reflectToAttribute` - when `true` configures the property value to
-     *    be serialized to a string and reflected to the attribute each time
-     *    it changes.  This can impact performance, so it should be used
-     *    only when reflecting the attribute value is important.
-     * * `observer` - indicates the name of a function that should be called
-     *    each time the property changes. `e.g.: `observer: 'valueChanged'
-     * * `computed` - configures the property to be computed by a computing
-     *    function each time one or more dependent properties change.
-     *    `e.g.: `computed: 'computeValue(prop1, prop2)'
-     *
-     * Note: a shorthand may be used for the object descriptor when only the
-     * type needs to be specified by using the type as the descriptor directly.
-     */
-    properties: {
-    },
-
     /**
      * Returns a property descriptor object for the property specified.
      *
@@ -178,4 +142,44 @@
 
   });
 
+/*
+ * Object containing property configuration data, where keys are property
+ * names and values are descriptor objects that configure Polymer features
+ * for the property.  Valid fields in the property descriptor object are
+ * as follows:
+ *
+ * * `type` - used to determine how to deserialize attribute value strings
+ *    to JS properties.  By convention, this field takes a JS constructor
+ *    for the type, such as `String` or `Boolean`.
+ * * `value` - default value for the property.  The value may either be a
+ *    primitive value, or a function that returns a value (which should be
+ *    used for initializing Objects and Arrays to avoid shared objects on
+ *    instances).
+ * * `notify` - when `true`, configures the property to fire a non-bubbling
+ *    event called `<property>-changed` for each change to the property.
+ *    Elements that have enabled two-way binding to the property use this
+ *    event to observe changes.
+ * * `readOnly` - when `true` configures the property to have a getter, but
+ *    no setter. To set a read-only property, use the private setter method
+ *    `_set_<property>(value)`.
+ * * `reflectToAttribute` - when `true` configures the property value to
+ *    be serialized to a string and reflected to the attribute each time
+ *    it changes.  This can impact performance, so it should be used
+ *    only when reflecting the attribute value is important.
+ * * `observer` - indicates the name of a function that should be called
+ *    each time the property changes. `e.g.: `observer: 'valueChanged'
+ * * `computed` - configures the property to be computed by a computing
+ *    function each time one or more dependent properties change.
+ *    `e.g.: `computed: 'computeValue(prop1, prop2)'
+ *
+ * Note: a shorthand may be used for the object descriptor when only the
+ * type needs to be specified by using the type as the descriptor directly.
+ * @memberof! feature: properties
+ */
+(function() {
+  var propertiesDesc = {configurable: true, writable: true};
+  Polymer.BaseDescriptors.properties = propertiesDesc;
+  Object.defineProperty(Polymer.Base, 'properties', propertiesDesc);
+})();
+
 </script>