Examine source code of EITCO: Context menu

{
  "manifest_version": 3,
  "author": "IDeev",
  "name": "EITCO: Context menu",
  "description": "Add a context menu option to links by EITCO",
  "version": "1.13",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "contextMenus",
    "clipboardWrite",
    "activeTab",
    "tabs",
    "scripting",
    "unlimitedStorage",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "page_action": {
    "default_title": "EITCO: Context menu",
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icon.png"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "buchungen_report.html",
        "report.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://projektron.eitco.de/*"
      ],
      "js": [
        "report.js"
      ]
    },
    {
      "matches": [
        "https://projektron.eitco.de/*"
      ],
      "js": [
        "script-check.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ideev@eitco.de",
      "strict_min_version": "140.0"
    }
  }
}