Examine source code of KOTOBAi

{
  "manifest_version": 3,
  "name": "KOTOBAi",
  "version": "0.1.3",
  "description": "Shows Japanese word definitions and reading by hovering over words.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "src/pages/background/index.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "src/pages/popup/index.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "src/pages/content/index.js"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/js/*.js",
        "assets/css/*.css",
        "assets/woff2/*.woff2",
        "icon.png"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kholid060.kotobai@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}