Examine source code of DnD Name Generator

{
  "manifest_version": 2,
  "name": "DnD Name Generator",
  "version": "1.0",
  "description": "A tool to generate DnD names.",
  "icons": {
    "48": "icon.png",
    "128": "icon.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{de7fdda6-25ce-46f8-b39e-26b212ec88de}"
    }
  }
}