groupBy then orderBy

I am using the groupBy filter, after groupBy filtering I would love to do orderBy filtering.
I have tried orderBy after the groupBy clause but that didn't work.

Can you extend your groupBy example(https://github.com/a8m/angular-filter#groupby) with the orderBy functionality.

My scenerio:
$scope.browsers = [
{UniquePageviews: 500, Browser: 'chrome'},
{UniquePageviews: 700, Browser: 'chrome'},
{UniquePageviews: 200, Browser: 'firefox'},
{UniquePageviews: 100, Browser: 'safari'},
{UniquePageviews: 250, Browser: 'safari'},
{UniquePageviews: 50, Browser: 'safari'},
{UniquePageviews: 0, Browser: 'opera'},
{UniquePageviews: 0, Browser: 'opera'},
{UniquePageviews: 1000, Browser: 'IE'},
{UniquePageviews: 800, Browser: 'IE'},
];

$scope.totalBrowserCount = function () {
var total = 0;
for (var i = 0; i < data.length; i++) {
var product = data[i].UniquePageviews;
total += product;
}
return total;
}

Above code groups the result and in the list it only shows each browser name. But as you can see few browsers have most unique visits (i.e. IE has 1800 in total), so I am expecting IE on the top of the list.