Examine source code of PolyDub

{
  "manifest_version": 2,
  "name": "PolyDub",
  "description": "AI视频翻译配音扩展，支持YouTube、Udemy、Coursera、B站、本地等多平台实时字幕翻译、AI配音、AI要点总结、知识流程图生成和字幕下载。",
  "version": "1.0.8",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "activeTab",
    "<all_urls>"
  ],
  "homepage_url": "https://poly-dub.com",
  "web_accessible_resources": [
    "unlisted-mermaid.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "polydub@qq.com",
      "strict_min_version": "109.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "PolyDub",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "match_about_blank": true,
      "run_at": "document_start",
      "css": [
        "content-scripts/dub.css"
      ],
      "js": [
        "content-scripts/dub.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/interceptor.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/sidebar.js"
      ]
    }
  ]
}