create: function() {
                    var custom_accept_string = "";
                    if (this.get("allowedextensions") && this.get("allowedextensions").length > 0) {
                        var browser_support = Info.isEdge() || Info.isChrome() || Info.isOpera() || (Info.isFirefox() && Info.firefoxVersion() >= 42) || (Info.isInternetExplorer() && Info.internetExplorerVersion() >= 10);
                        if (browser_support)