Examine source code of 知乎外链直达

{
  "manifest_version": 2,
  "name": "知乎外链直达",
  "version": "1.1.2resigned1",
  "author": "paicha",
  "description": "移除知乎外部链接重定向，加速上网、避免访问追踪。",
  "homepage_url": "https://github.com/paicha/zhihu-undirect",
  "icons": {
    "16": "/images/icon16.png",
    "48": "/images/icon48.png",
    "128": "/images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.zhihu.com/*"
      ],
      "js": [
        "undirect.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e1896037-b13b-4fe4-9aaf-3fc14d0f5c54}"
    }
  }
}