Examine source code of Music Player

{
  "manifest_version": 2,
  "name": "Jamendo Music Player",
  "version": "1.0",
  "description": "Enjoy music right on your browser",
  "permissions": [
    "https://api.jamendo.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{89d5fe83-9b4d-452f-afca-7d721dfa344d}"
    }
  }
}