Examine source code of QiuReader

{
  "manifest_version": 2,
  "name": "QiuReader",
  "version": "0.1.5",
  "description": "a simple epub reader",
  "icons": {
    "128": "img/Qiu.png"
  },
  "browser_action": {
    "default_icon": {
      "30": "img/Qiu.png"
    },
    "default_title": "QiuReader"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "tabs"
  ]
}