Examine source code of seats.aero

{
  "manifest_version": 3,
  "name": "seats.aero",
  "description": "Easily search for award availability on Google Flights, Chase Travel, and Amex Travel.",
  "version": "1.3.43",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://seats.aero/*",
    "https://www.travel.americanexpress.com/*"
  ],
  "action": {
    "default_title": "Open on seats.aero"
  },
  "externally_connectable": {
    "matches": [
      "https://seats.aero/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@seats.aero",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "searchTerms"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://travelsecure.chase.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/chase-main.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "https://travelsecure.chase.com/*"
      ],
      "css": [
        "content-scripts/chase.css"
      ],
      "js": [
        "content-scripts/chase.js"
      ]
    },
    {
      "matches": [
        "https://www.google.ca/travel/flights*",
        "https://www.google.co.uk/travel/flights*",
        "https://www.google.com.au/travel/flights*",
        "https://www.google.com/travel/flights*",
        "https://www.google.de/travel/flights*",
        "https://www.google.fr/travel/flights*"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "https://seats.aero/firefox/welcome*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/welcome.js"
      ]
    }
  ]
}