Examine source code of Payment Fee Calculator

{
  "manifest_version": 2,
  "name": "Payment Fee Calculator",
  "version": "1.0.0",
  "description": "Highlight any dollar amount to compare fees on Venmo, PayPal, Stripe, Square, Cash App, and Zelle.",
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "payment-fee-calculator@payable.at",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}