Examine source code of NotionX ( for Notion )

{
  "manifest_version": 2,
  "name": "NotionX ( for Notion )",
  "homepage_url": "http://scarsu.cn/notionx/",
  "description": "A Browser Extension that enhances Notion experience.",
  "default_locale": "en",
  "permissions": [
    "https://*.notion.so/*"
  ],
  "icons": {
    "16": "icons/notionx-white.png",
    "48": "icons/notionx-white.png",
    "128": "icons/notionx-white.png"
  },
  "background": {
    "persistent": false,
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.notion.so/*"
      ],
      "js": [
        "js/content-script.js"
      ],
      "css": [
        "css/content-script.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "NotionX ( for Notion )",
    "default_icon": {
      "19": "icons/notionx-white.png",
      "38": "icons/notionx-white.png"
    }
  },
  "version": "2.1.3",
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}