Examine source code of HTML Email Attachment Preview

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "0.1.0",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "src/ui/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "service_worker": "src/background.js",
    "scripts": [
      "src/background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://mail.google.com/*",
    "https://mail.naver.com/*",
    "https://download.mail.naver.com/*",
    "https://mail.daum.net/*",
    "https://cmail.daum.net/*",
    "https://mail.kakao.com/*",
    "https://cmail.kakao.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "src/lib/sender-extract.js",
        "src/lib/settings.js",
        "src/lib/whitelist.js",
        "src/lib/banner.js",
        "src/lib/viewer.js",
        "src/adapters/gmail.js"
      ],
      "css": [
        "src/styles/common.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://mail.naver.com/*"
      ],
      "js": [
        "src/lib/sender-extract.js",
        "src/lib/settings.js",
        "src/lib/whitelist.js",
        "src/lib/banner.js",
        "src/lib/viewer.js",
        "src/adapters/naver.js"
      ],
      "css": [
        "src/styles/common.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://mail.daum.net/*",
        "https://mail.kakao.com/*"
      ],
      "js": [
        "src/lib/sender-extract.js",
        "src/lib/settings.js",
        "src/lib/whitelist.js",
        "src/lib/banner.js",
        "src/lib/viewer.js",
        "src/adapters/daum.js"
      ],
      "css": [
        "src/styles/common.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "sandbox": {
    "pages": [
      "src/ui/viewer.html"
    ]
  },
  "content_security_policy": {
    "sandbox": "sandbox allow-scripts allow-forms allow-popups allow-modals allow-downloads; script-src * 'unsafe-inline' 'unsafe-eval' data: blob:; style-src * 'unsafe-inline' data: blob:; img-src * data: blob:; font-src * data: blob:; connect-src * data: blob:; frame-src * data: blob:; child-src * data: blob:; object-src * data: blob:; media-src * data: blob:; default-src * 'unsafe-inline' 'unsafe-eval' data: blob:; upgrade-insecure-requests"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "src/ui/viewer.html",
        "src/ui/viewer-window.html"
      ],
      "matches": [
        "https://mail.google.com/*",
        "https://mail.naver.com/*",
        "https://mail.daum.net/*",
        "https://mail.kakao.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "html-email-attachment-preview@parkjeongseop.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}