Problem with GETJSON ? chrome extension

hi,
i’ve got some problem with getjson. Actually i developt an chrome extension. $getJson work in the background.js but when i use him in my pop.js he doesn’t work?

$.getJSON(‘https://api.twitch.tv/kraken/streams/Rush’, function(channel) {

 if (channel["stream"]==null) { document.getElementById("live").innerHTML='<h3>OFFLINE</h3>';}
 if (channel["stream"]!=null) { document.getElementById("live").innerHTML='<h3>ONLINE</h3>';}

}

)

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