Examine source code of Smart Guest

{
"manifest_version": 2,
"version": "1.0",
"name": "SmartGuestApp",
"description": "Application du SmartGuest club.",
"default_locale": "en",
"short_name":"SmartGuest",
"icons": { 
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png" },
"author": "NWD",
"content_scripts": [
    {
      "matches": ["https://www.booking.com/hotel/*"],
      "js": ["scripts/lib/jquery-3.3.1.slim.min.js", "scripts/changeText.js"]
    },
    {
      "matches": ["https://www.google.com/*smartguestclub*"],
      "js": ["scripts/lib/jquery-3.3.1.slim.min.js", "scripts/googleSmartBox.js"]
    }
],
//"options_page": "pages/options.html",
"homepage_url":"https://midweeks.net/",
"permissions": [
    "https://midweeks.net/",
    "https://www.smartguest.club/",
    "https://www.google-analytics.com/",
    "storage"
],
"web_accessible_resources": [
    "assets/*.png",
    "styles/*.css",
    "scripts/lib/*.js",
    "script/*.js"
],
"browser_action": {},
"background": {
"scripts": ["scripts/onInstalled.js", "scripts/pingsmartguestga.js"],
"persistent": false
}
}