Examine source code of Travianstat

{
  "manifest_version": 2,
  "name": "TravianStat HTML Sender",
  "version": "2.1",
  "description": "Envía el HTML de Travian a la API.",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/ts.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/ts.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{450f16cc-26b1-4900-ade6-be5f8db2f03b}"
    }
  }
}