Examine source code of FlashCart

{
  "manifest_version": 3,
  "name": "FlashCart",
  "short_name": "FlashCart",
  "version": "4.0.1",
  "author": "Chetan Kaul",
  "description": "A tool to help you in Flipkart, Amazon, Realme Flash Sale, Auto buy, Auto checkout features built-in.",
  "homepage_url": "https://flashcart.in",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "flashcart@flashcart.in",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {}
  },
  "action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html",
    "default_title": "Flashcart ⚡"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "firebase-sdk/firebase-app.js",
      "firebase-sdk/firebase-database.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.jiomart.com/p/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/jiomart/layout.js",
        "site_access/jiomart/content.js"
      ]
    },
    {
      "matches": [
        "*://www.oneplus.in/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/oplus/layout.js",
        "site_access/oplus/content.js"
      ]
    },
    {
      "matches": [
        "*://mallapi.oneplus.in/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/oplus/api_layout.js",
        "site_access/oplus/api_content.js"
      ]
    },
    {
      "matches": [
        "*://shop.vivo.com/in/product*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/vivo/layout.js",
        "site_access/vivo/content.js"
      ]
    },
    {
      "matches": [
        "*://shop.vivo.com/in/flash/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/vivo/api_layout.js",
        "site_access/vivo/api_content.js"
      ]
    },
    {
      "matches": [
        "*://*.mi.com/*",
        "*://*.oppo.com/*",
        "*://*.vivo.com/*",
        "*://*.realme.com/*",
        "*://*.croma.com/*/p/*",
        "*://*.oneplus.in/*",
        "*://*.ajio.com/*/p/*",
        "*://*.nykaa.com/*/p/*",
        "*://mamaearth.in/product/*",
        "*://*.myntra.com/*/buy*",
        "*://*.adidas.co.in/*/*",
        "*://*.jockey.in/products/*",
        "*://*.hm.com/en_in/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/default/rd.js"
      ]
    },
    {
      "matches": [
        "*://www.mi.com/in/product*",
        "*://store.mi.com/in/item/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/mi/mi_layout.js",
        "site_access/mi/mi_content.js"
      ]
    },
    {
      "matches": [
        "*://in-go.buy.mi.com/in/buy/product*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/mi/mi_api_layout.js",
        "site_access/mi/mi_api_content.js"
      ]
    },
    {
      "matches": [
        "*://buy.realme.com/in/goods/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/realme/realme_layout.js",
        "site_access/realme/realme_content.js"
      ]
    },
    {
      "matches": [
        "*://api.realme.com/in/goods/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/realme/realme_api_layout.js",
        "site_access/realme/realme_api_content.js"
      ]
    },
    {
      "matches": [
        "*://www.oppo.com/in/product/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/oppo/oppo_layout.js",
        "site_access/oppo/oppo_content.js"
      ]
    },
    {
      "matches": [
        "*://www.oppo.com/flash/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/oppo/oppo_api_layout.js",
        "site_access/oppo/oppo_api_content.js"
      ]
    },
    {
      "matches": [
        "*://www.meesho.com/*/p/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/meesho/layout.js",
        "site_access/meesho/content.js"
      ]
    },
    {
      "matches": [
        "*://www.shopsy.in/*/p/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "site_access/shopsy/shopsy_layout.js",
        "site_access/shopsy/shopsy_content.js"
      ]
    },
    {
      "matches": [
        "*://*.flipkart.com/*/p/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "flipkart_layout.js",
        "flipkart_content.js"
      ]
    },
    {
      "matches": [
        "*://www.amazon.in/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "amazon_goldbox.js",
        "amz_checkout.js"
      ],
      "css": [
        "amazon_goldbox_layout.css"
      ]
    },
    {
      "matches": [
        "*://store.amazon.in/*"
      ],
      "js": [
        "jquery-3.7.1.min.js",
        "amazon_store_goldbox.js"
      ],
      "css": [
        "amazon_goldbox_layout.css"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.flipkart.com/*",
    "*://*.firebaseio.com/*",
    "*://*.googleapis.com/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "/sounds/checkout.mp3",
        "/sounds/captcha.mp3"
      ],
      "matches": [
        "*://*.flipkart.com/*",
        "*://*.amazon.in/*",
        "*://*.oppo.com/*",
        "*://*.realme.com/*",
        "*://*.mi.com/*",
        "*://*.oneplus.in/*",
        "*://*.vivo.com/*",
        "*://*.croma.com/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; connect-src 'self' https://*.firebaseio.com wss://*.firebaseio.com https://*.googleapis.com https://dealyaari.com;"
  }
}