Examine source code of nRadio Player

{
  "name": "nRadio Player",
  "short_name": "nRadio",
  "version": "2.2resigned1",
  "manifest_version": 2,
  "author": "spont4e",
  "description": "Simple radio player for nRadio. nRadio is The Coolest Station Online because play Deep, House, Nu-Disco, Progressive, Tech, Chillout",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/nradio-player/",
  "gecko": {
    "id": "nradio-player@nradio.online",
    "strict_min_version": "42.0",
    "update_url": "https://addons.mozilla.org/en-US/firefox/addon/nradio-player/"
  },
  "icons": {
    "48": "img/nRadio-48.png",
    "64": "img/nRadio-64.png",
    "128": "img/nRadio-128.png"
  },
  "browser_action": {
    "default_icon": "img/nRadio-64.png",
    "default_title": "nRadio Player",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [],
    "page": "background/background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{37652422-531b-4acc-823a-190b2ad2dfba}"
    }
  }
}