Examine source code of WeChat Web Extension

{
  "manifest_version": 2,
  "name": "WeChat Web Extension",
  "version": "1.0.0",
  "description": "Quick access and lightweight preview for WeChat Web (web.wechat.com / wx.qq.com).",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "*://web.wechat.com/*",
    "*://wx.qq.com/*"
  ],
  "sidebar_action": {
    "default_title": "WeChat Web",
    "default_panel": "sidebar.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://web.wechat.com/*",
        "*://wx.qq.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{262c26ac-b8e1-43eb-bef2-f382ff283cfa}"
    }
  }
}