Examine source code of Mooc Assistant

{
  "manifest_version": 2,
  "name": "Mooc Assistant",
  "version": "2.2.1",
  "icons": {
    "16": "assets/icons/icon_16x16.png",
    "48": "assets/icons/icon_48x48.png",
    "64": "assets/icons/icon_64x64.png",
    "128": "assets/icons/icon_128x128.png"
  },
  "description": "简单的慕课助手",
  "homepage_url": "https://github.com/unbyte/mooc-assistant",
  "short_name": "慕课助手",
  "permissions": [
    "storage",
    "*://www.icourse163.org/*",
    "*://*.ulearning.cn//*"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "author": "helios",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.icourse163.org/*"
      ],
      "js": [
        "js/content_netease.bundle.js"
      ],
      "css": [
        "css/content_netease.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://ua.ulearning.cn/learnCourse/*"
      ],
      "js": [
        "js/content_ulearning.bundle.js"
      ],
      "css": [
        "css/content_ulearning.css"
      ]
    }
  ]
}