Examine source code of Smart Redemptions

{
  "manifest_version": 3,
  "name": "Points & Miles on Google Flights",
  "version": "2.4.4",
  "summary": "Smart Redemptions is a browser extension that displays the miles & points needed for flights searched on Google Flights.",
  "description": "Smart Redemptions is a browser extension that displays the miles & points needed for flights searched on Google Flights. It supports many frequent flyer programs and credit card points programs, and helps you find the best redemption options for your flights.",
  "icons": {
    "16": "assets/logo.png",
    "48": "assets/logo.png",
    "128": "assets/logo.png",
    "1200": "assets/logo.png"
  },
  "background": {
    "scripts": [
      "backgroundWorker.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "smartredemptions@example.com",
      "strict_min_version": "58.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/travel/flights*",
        "*://*.google.ie/travel/flights*",
        "*://*.google.co.uk/travel/flights*",
        "*://*.google.es/travel/flights*",
        "*://*.google.com.mx/travel/flights*",
        "*://*.google.com.ar/travel/flights*",
        "*://*.google.com.br/travel/flights*",
        "*://*.google.com.au/travel/flights*",
        "*://*.google.ca/travel/flights*",
        "*://*.google.co.in/travel/flights*",
        "*://*.google.co.jp/travel/flights*",
        "*://*.google.co.kr/travel/flights*",
        "*://*.google.co.nz/travel/flights*",
        "*://*.google.co.za/travel/flights*",
        "*://*.google.de/travel/flights*",
        "*://*.google.fr/travel/flights*",
        "*://*.google.it/travel/flights*",
        "*://*.google.nl/travel/flights*",
        "*://*.google.pl/travel/flights*",
        "*://*.google.ru/travel/flights*",
        "*://*.google.se/travel/flights*",
        "*://*.google.com.tr/travel/flights*",
        "*://*.google.com.vn/travel/flights*",
        "*://*.google.com.pe/travel/flights*",
        "*://*.google.com.pk/travel/flights*",
        "*://*.google.com.ph/travel/flights*",
        "*://*.google.be/travel/flights*",
        "*://*.google.pt/travel/flights*",
        "*://*.google.dk/travel/flights*",
        "*://*.google.fi/travel/flights*",
        "*://*.google.no/travel/flights*",
        "*://*.google.ch/travel/flights*",
        "*://*.google.at/travel/flights*",
        "*://*.google.my/travel/flights*",
        "*://*.google.sg/travel/flights*",
        "*://*.google.hk/travel/flights*",
        "*://*.google.th/travel/flights*",
        "*://*.google.bg/travel/flights*",
        "*://*.google.ro/travel/flights*",
        "*://*.google.hu/travel/flights*",
        "*://*.google.ua/travel/flights*",
        "*://*.google.gr/travel/flights*",
        "*://*.google.lt/travel/flights*",
        "*://*.google.lv/travel/flights*",
        "*://*.google.ee/travel/flights*",
        "*://*.google.hr/travel/flights*",
        "*://*.google.si/travel/flights*",
        "*://*.google.sk/travel/flights*",
        "*://*.google.lu/travel/flights*",
        "*://*.google.cy/travel/flights*",
        "*://*.google.is/travel/flights*",
        "*://*.google.mt/travel/flights*",
        "*://*.google.com.eg/travel/flights*",
        "*://*.google.com.sa/travel/flights*",
        "*://*.google.com.ng/travel/flights*",
        "*://*.google.com.gh/travel/flights*",
        "*://*.google.co.ke/travel/flights*",
        "*://*.google.co.ug/travel/flights*",
        "*://*.google.co.il/travel/flights*",
        "*://*.google.com.qa/travel/flights*",
        "*://*.google.com.bh/travel/flights*",
        "*://*.google.com.kw/travel/flights*",
        "*://*.google.com.om/travel/flights*",
        "*://*.google.com.lb/travel/flights*",
        "*://*.google.com.jo/travel/flights*",
        "*://*.google.com.cy/travel/flights*",
        "*://*.google.ps/travel/flights*",
        "*://*.google.com.np/travel/flights*",
        "*://*.google.com.bd/travel/flights*",
        "*://*.google.com.mm/travel/flights*",
        "*://*.google.co.id/travel/flights*",
        "*://*.google.com.kh/travel/flights*",
        "*://*.google.la/travel/flights*",
        "*://*.google.com.bn/travel/flights*",
        "*://*.google.com.fj/travel/flights*",
        "*://*.google.com.pg/travel/flights*",
        "*://*.google.com.ua/travel/flights*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "interceptor.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "oauth2": {
    "client_id": "837554300581-p29prebvoeot8eb2hqpqphhj0s9gubdm.apps.googleusercontent.com",
    "web_client_id": "837554300581-ti3g0up4l56nj7lfvh23n0067vlba42e.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email",
      "https://www.googleapis.com/auth/userinfo.profile"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "cookies",
    "alarms"
  ],
  "host_permissions": [
    "https://app.smartredemptions.com/",
    "https://api.smartredemptions.com/"
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAowNfHeCF7svwvIQDBZseb1j2UfkUk9YSYPewc8YoC/nXSrgl1SEvgSrGZr17hMTK3PaVHAZHHzhChkaoLsjT+YeGjdInXmTQK5qBfxdD5M5Bp4VUlu+s+k1zFMHqrM6rVXzECmeijWFMr1sDeU5IaTVOFYI8kKidaARjuEjIoYHmJt+5nsF3x8u02iJnNoavObFNteZdPROzxfEqGBQJ9RciE4eRBcNwKjZfV1SYexIOv8/aHDMQYVk7aMF4HKlkZlMb4xaBxE9k/LNyCfjmkQOY7luThNEhhy33b4ccVVnDfxuiuYWLj/89Zljem0C3B7mdHvKzk47LGNwFa93WwwIDAQAB"
}