Examine source code of NextEO

{
  "manifest_version": 3,
  "name": "NextEO",
  "version": "1.2.4",
  "description": "Extension to manipulate EM pages",
  "icons": {
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "*://*.editorialmanager.com/*/EMDetails.*"
      ],
      "css": [
        "css/details.css",
        "css/coicheck.css",
        "css/sanctions.css"
      ],
      "js": [
        "js/coicheck.js",
        "js/setup.js",
        "js/sanctions.js",
        "js/details.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "hakimmeskine@gmail.com"
    }
  }
}