Examine source code of MoonPlayer helper

{
  "background": {
    "scripts": [
      "moonplayer.js"
    ]
  },
  "description": "MoonPlayer helper",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "manifest_version": 2,
  "name": "MoonPlayer helper",
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "version": "2.0"
}