Examine source code of CashCatch: Best Cashback, Every Site

{
  "manifest_version": 2,
  "name": "CashCatch: best cashback, every site",
  "description": "See the best card + cashback stack for the site you are on. Runs on your device.",
  "version": "0.4.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cashcatch@cashcatch.app",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "authenticationInfo"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "CashCatch",
    "default_popup": "popup.html"
  },
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      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/checkout.js"
      ]
    },
    {
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        "*://getcashcatch.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/login-sync.js"
      ]
    }
  ]
}