Examine source code of ShortDOI Generator

{
  "manifest_version": 3,
  "name": "Short DOI Generator",
  "version": "1.0.2",
  "description": "Generate short DOIs using shortdoi.org",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://shortdoi.org/*",
    "https://doi.org/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Short DOI Generator"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "shortdoi-generator@ianching.com"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}