Examine source code of HearSub - YouTube Dubbing, AI Video Translation &

{
  "manifest_version": 3,
  "name": "HearSub for Firefox",
  "short_name": "HearSub",
  "default_locale": "en",
  "version": "0.0.9",
  "description": "__MSG_extensionDescription__",
  "action": {
    "default_title": "HearSub for Firefox",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "identity",
    "webRequest"
  ],
  "host_permissions": [
    "https://*.youtube.com/*",
    "https://*.googlevideo.com/*",
    "https://hearsub.ai/*",
    "https://www.hearsub.ai/*"
  ],
  "background": {
    "scripts": [
      "assets/offscreen.js",
      "assets/background.js"
    ],
    "type": "module"
  },
  "externally_connectable": {
    "matches": [
      "https://hearsub.ai/*",
      "https://www.hearsub.ai/*"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*",
        "https://*.bilibili.com/*"
      ],
      "js": [
        "assets/inject.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://*.youtube.com/*",
        "https://*.bilibili.com/*"
      ],
      "js": [
        "assets/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "index.html",
        "assets/*.js",
        "assets/*.css",
        "icons/*.png"
      ],
      "matches": [
        "https://*.youtube.com/*",
        "https://*.bilibili.com/*"
      ]
    }
  ],
  "version_name": "0.0.9",
  "browser_specific_settings": {
    "gecko": {
      "id": "hearsub@hearsub.ai",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "browsingActivity",
          "websiteContent",
          "websiteActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}