Examine source code of Flight Fare Compare - Google Flights Tool

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manifest.json
{
  "manifest_version": 2,
  "name": "Flight Fare Compare - Google Flights Tool",
  "short_name": "FFC",
  "description": "Convert Google travel/flights searches to Momondo, Kayak, or Skyscanner to find cheap travel/flights.",
  "version": "1.4.0",
  "icons": {
    "16": "img/icon/icon16.png",
    "32": "img/icon/icon32.png",
    "48": "img/icon/icon48.png",
    "128": "img/icon/icon128.png"
  },
  "browser_action": {
    "default_icon": "img/icon/icon32.png",
    "default_popup": "html/settings.html"
  },
  "permissions": [
    "storage",
    "https://www.google.al/flights*",
    "https://www.google.am/flights*",
    "https://www.google.com.au/flights*",
    "https://www.google.az/flights*",
    "https://www.google.by/flights*",
    "https://www.google.ba/flights*",
    "https://www.google.be/flights*",
    "https://www.google.com.br/flights*",
    "https://www.google.bg/flights*",
    "https://www.google.ca/flights*",
    "https://www.google.hr/flights*",
    "https://www.google.cz/flights*",
    "https://www.google.ee/flights*",
    "https://www.google.fi/flights*",
    "https://www.google.no/flights*",
    "https://www.google.fr/flights*",
    "https://www.google.ge/flights*",
    "https://www.google.de/flights*",
    "https://www.google.gr/flights*",
    "https://www.google.dk/flights*",
    "https://www.google.hu/flights*",
    "https://www.google.is/flights*",
    "https://www.google.co.in/flights*",
    "https://www.google.co.id/flights*",
    "https://www.google.ie/flights*",
    "https://www.google.it/flights*",
    "https://www.google.lv/flights*",
    "https://www.google.lu/flights*",
    "https://www.google.mk/flights*",
    "https://www.google.com.my/flights*",
    "https://www.google.com.mx/flights*",
    "https://www.google.me/flights*",
    "https://www.google.nl/flights*",
    "https://www.google.co.nz/flights*",
    "https://www.google.pl/flights*",
    "https://www.google.pt/flights*",
    "https://www.google.ro/flights*",
    "https://www.google.ru/flights*",
    "https://www.google.rs/flights*",
    "https://www.google.si/flights*",
    "https://www.google.sk/flights*",
    "https://www.google.es/flights*",
    "https://www.google.se/flights*",
    "https://www.google.co.uk/flights*",
    "https://www.google.com/flights*",
    "https://www.google.com.ua/flights*",
    "https://www.google.al/travel/flights*",
    "https://www.google.am/travel/flights*",
    "https://www.google.com.au/travel/flights*",
    "https://www.google.az/travel/flights*",
    "https://www.google.by/travel/flights*",
    "https://www.google.ba/travel/flights*",
    "https://www.google.be/travel/flights*",
    "https://www.google.com.br/travel/flights*",
    "https://www.google.bg/travel/flights*",
    "https://www.google.ca/travel/flights*",
    "https://www.google.hr/travel/flights*",
    "https://www.google.cz/travel/flights*",
    "https://www.google.ee/travel/flights*",
    "https://www.google.fi/travel/flights*",
    "https://www.google.no/travel/flights*",
    "https://www.google.fr/travel/flights*",
    "https://www.google.ge/travel/flights*",
    "https://www.google.de/travel/flights*",
    "https://www.google.gr/travel/flights*",
    "https://www.google.dk/travel/flights*",
    "https://www.google.hu/travel/flights*",
    "https://www.google.is/travel/flights*",
    "https://www.google.co.in/travel/flights*",
    "https://www.google.co.id/travel/flights*",
    "https://www.google.ie/travel/flights*",
    "https://www.google.it/travel/flights*",
    "https://www.google.lv/travel/flights*",
    "https://www.google.lu/travel/flights*",
    "https://www.google.mk/travel/flights*",
    "https://www.google.com.my/travel/flights*",
    "https://www.google.com.mx/travel/flights*",
    "https://www.google.me/travel/flights*",
    "https://www.google.nl/travel/flights*",
    "https://www.google.co.nz/travel/flights*",
    "https://www.google.pl/travel/flights*",
    "https://www.google.pt/travel/flights*",
    "https://www.google.ro/travel/flights*",
    "https://www.google.ru/travel/flights*",
    "https://www.google.rs/travel/flights*",
    "https://www.google.si/travel/flights*",
    "https://www.google.sk/travel/flights*",
    "https://www.google.es/travel/flights*",
    "https://www.google.se/travel/flights*",
    "https://www.google.co.uk/travel/flights*",
    "https://www.google.com/travel/flights*",
    "https://www.google.com.ua/travel/flights*"
  ],
  "content_scripts": [
    {
      "js": [
        "js/injectGeneral.js"
      ],
      "matches": [
        "https://www.google.al/flights*",
        "https://www.google.am/flights*",
        "https://www.google.com.au/flights*",
        "https://www.google.az/flights*",
        "https://www.google.by/flights*",
        "https://www.google.ba/flights*",
        "https://www.google.be/flights*",
        "https://www.google.com.br/flights*",
        "https://www.google.bg/flights*",
        "https://www.google.ca/flights*",
        "https://www.google.hr/flights*",
        "https://www.google.cz/flights*",
        "https://www.google.ee/flights*",
        "https://www.google.fi/flights*",
        "https://www.google.no/flights*",
        "https://www.google.fr/flights*",
        "https://www.google.ge/flights*",
        "https://www.google.de/flights*",
        "https://www.google.gr/flights*",
        "https://www.google.dk/flights*",
        "https://www.google.hu/flights*",
        "https://www.google.is/flights*",
        "https://www.google.co.in/flights*",
        "https://www.google.co.id/flights*",
        "https://www.google.ie/flights*",
        "https://www.google.it/flights*",
        "https://www.google.lv/flights*",
        "https://www.google.lu/flights*",
        "https://www.google.mk/flights*",
        "https://www.google.com.my/flights*",
        "https://www.google.com.mx/flights*",
        "https://www.google.me/flights*",
        "https://www.google.nl/flights*",
        "https://www.google.co.nz/flights*",
        "https://www.google.pl/flights*",
        "https://www.google.pt/flights*",
        "https://www.google.ro/flights*",
        "https://www.google.ru/flights*",
        "https://www.google.rs/flights*",
        "https://www.google.si/flights*",
        "https://www.google.sk/flights*",
        "https://www.google.es/flights*",
        "https://www.google.se/flights*",
        "https://www.google.co.uk/flights*",
        "https://www.google.com/flights*",
        "https://www.google.com.ua/flights*",
        "https://www.google.al/travel/flights*",
        "https://www.google.am/travel/flights*",
        "https://www.google.com.au/travel/flights*",
        "https://www.google.az/travel/flights*",
        "https://www.google.by/travel/flights*",
        "https://www.google.ba/travel/flights*",
        "https://www.google.be/travel/flights*",
        "https://www.google.com.br/travel/flights*",
        "https://www.google.bg/travel/flights*",
        "https://www.google.ca/travel/flights*",
        "https://www.google.hr/travel/flights*",
        "https://www.google.cz/travel/flights*",
        "https://www.google.ee/travel/flights*",
        "https://www.google.fi/travel/flights*",
        "https://www.google.no/travel/flights*",
        "https://www.google.fr/travel/flights*",
        "https://www.google.ge/travel/flights*",
        "https://www.google.de/travel/flights*",
        "https://www.google.gr/travel/flights*",
        "https://www.google.dk/travel/flights*",
        "https://www.google.hu/travel/flights*",
        "https://www.google.is/travel/flights*",
        "https://www.google.co.in/travel/flights*",
        "https://www.google.co.id/travel/flights*",
        "https://www.google.ie/travel/flights*",
        "https://www.google.it/travel/flights*",
        "https://www.google.lv/travel/flights*",
        "https://www.google.lu/travel/flights*",
        "https://www.google.mk/travel/flights*",
        "https://www.google.com.my/travel/flights*",
        "https://www.google.com.mx/travel/flights*",
        "https://www.google.me/travel/flights*",
        "https://www.google.nl/travel/flights*",
        "https://www.google.co.nz/travel/flights*",
        "https://www.google.pl/travel/flights*",
        "https://www.google.pt/travel/flights*",
        "https://www.google.ro/travel/flights*",
        "https://www.google.ru/travel/flights*",
        "https://www.google.rs/travel/flights*",
        "https://www.google.si/travel/flights*",
        "https://www.google.sk/travel/flights*",
        "https://www.google.es/travel/flights*",
        "https://www.google.se/travel/flights*",
        "https://www.google.co.uk/travel/flights*",
        "https://www.google.com/travel/flights*",
        "https://www.google.com.ua/travel/flights*"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "js/*",
    "html/*",
    "css/*",
    "fonts/*",
    "img/*"
  ],
  "background": {
    "scripts": [
      "js/defaultStorage.js",
      "js/background.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "support@jacksflightclub.com"
    }
  }
}