Examine source code of Write Flyre

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "0.1.4",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "write@flyer.swgc",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "clipboardWrite",
    "downloads"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "options_ui": {
    "open_in_tab": true,
    "page": "options/index.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "content/writeflyre.css",
        "iframe/iwriteflyre.html",
        "iframe/iwriteflyre.js",
        "iframe/iwriteflyre.css"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/writeflyre.js"
      ],
      "all_frames": true
    }
  ],
  "action": {
    "default_icon": {
      "16": "images/icon16_on.png"
    }
  },
  "icons": {
    "16": "images/icon16_on.png",
    "128": "images/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}