Thanks @WLG3R, I’ve tested adding it directly in a script tag on the index.html page (I’m on local test right now, so script tags do fire properly), but no success, I get the exact same result.
Do you reckon this is the correct way of getting the game currently played, on page load?
I don’t know how much top level I can put it 
<script>
window.Twitch.ext.onContext(function(context, changed) {
console.log(context);
console.log(changed);
});
</script>