Examine source code of Irigo Bus tickets list

{
  "manifest_version": 2,
  "name": "Irigo available Bus tickets",
  "version": "2.2resigned1",
  "description": "Lists the different types of bus tickets available from Irigo",
  "homepage_url": "https://www.irigo.fr/37-Titres-et-tarifs.html",
  "icons": {
    "48": "icons/bus48.png",
    "64": "icons/bus64.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Irigo available Bus tickets by: Ferrante",
    "default_popup": "popupMain.html",
    "default_icon": {
      "19": "icons/bus19.png",
      "38": "icons/bus38.png"
    }
  },
  "background": {
    "scripts": [
      "irigo.js"
    ]
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7d436c1-fa8d-4283-ad47-f88ec1559b84}"
    }
  }
}