Examine source code of VoyageVoyage

{
  "applications": {
    "gecko": {
      "id": "theodorelaforge1980@gmail.com",
      "strict_min_version": "55.0"
    }
  },
  "name": "VoyageVoyage",
  "version": "1.0",
  "description": "Voyagez moins chers avec VoyageVoyage !",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "css": [
        "css/contentStyle.css"
      ],
      "js": [
        "js/contentScript.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "images/background.png",
    "images/close_icon.png",
    "images/help_icon.png"
  ],
  "manifest_version": 2
}