Examine source code of weReaDou

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "weReaDou",
  "description": "✳️ 在豆瓣中显示微信读书的可读状态",
  "version": "1.1",
  "icons": {
    "16": "images/icon@16.png",
    "32": "images/icon@32.png",
    "48": "images/icon@48.png",
    "128": "images/icon@128.png"
  },
  "author": "sorosliu",
  "homepage_url": "https://github.com/Sorosliu1029/weReaDou",
  "content_scripts": [
    {
      "matches": [
        "https://book.douban.com/subject/*"
      ],
      "js": [
        "js/vendor.js",
        "js/content_script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/vendor.js",
      "js/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "https://weread.qq.com/"
  ],
  "offline_enabled": false,
  "browser_specific_settings": {
    "gecko": {
      "id": "{bac03562-e621-41c3-a289-e40bd0731ef7}"
    }
  }
}