Examine source code of Promomoto

{
  "description": "Promomoto - Plateforme e-commerce et annonce moto gratuite",
  "manifest_version": 2,
  "name": "Promomoto",
  "version": "1.0",
  "homepage_url": "https://promomoto.fr",
  "icons": {
    "48": "promomoto-48.png",
    "96": "promomoto-96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://promomoto.fr/?ref=firefox&version=1-0"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "promomoto-48.png"
  }
}