Examine source code of Firepol

{
  "manifest_version": 2,
  "name": "Firepol",
  "version": "1.5",
  "description": "Textes légaux utiles à la Police intégrée belge.",
  "homepage_url": "https://nthill.be",
  "icons": {
    "32": "icons/firepol32.png",
    "48": "icons/firepol48.png",
    "96": "icons/firepol96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/firepol32.png",
    "default_title": "Firepol - Textes utiles",
    "default_popup": "popup/index.html"
  }
}