add support for folder upload on firefox

package.json

@@ -116,7 +116,7 @@
         "c9.ide.theme.flat": "#81dadeee55",
         "c9.ide.threewaymerge": "#229382aa0b",
         "c9.ide.undo": "#b028bcb4d5",
-        "c9.ide.upload": "#0bd010d3dc",
+        "c9.ide.upload": "#a3da59803d",
         "c9.ide.welcome": "#5b86c44e92",
         "c9.ide.guide": "#8ab966f344"
     }

plugins/c9.ide.tree/tree.js

@@ -1082,6 +1082,8 @@ define(function(require, exports, module) {
                 if (typeof node == "string")
                     node = fsCache.findNode(node, "refresh");
 
+                if (node && !node.isFolder)
+                    node = node.parent;
                 if (node && node.status === "loaded") {
                     tree.provider.setAttribute(node, "status", "pending");
                     node.children = null;