Examine source code of How Long to Read

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.0.8",
  "description": "__MSG_extensionDescription__",
  "author": "Daniel Rozenberg",
  "homepage_url": "https://github.com/danielrozenberg/how-long-to-read",
  "icons": {
    "48": "icons/logo.svg",
    "96": "icons/logo.svg"
  },
  "background": {
    "scripts": [
      "background.mjs"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_icon": "icons/logo.svg",
    "default_title": "How Long to Read"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc5bb564-a9fe-4363-a72a-84f1499acf81}"
    }
  }
}