Having png icons seems to break getCurrentFavicon

Including these in your head 

```
<link rel="shortcut icon" sizes="196x196" href="/img/logo-square-196.png">
<link rel="shortcut icon" sizes="128x128" href="/img/logo-square-128.png">
```

and a valid favicon.ico in the root of the site (not linked in a tag). Seems to break favicons on Chrome.
