Examine source code of Axie Infinity Addon

{
  "manifest_version": 2,
  "name": "Axie Addon",
  "version": "1.2.0",
  "permissions": [
    "activeTab"
  ],
  "description": "extension for Axie Infinity Marketplace.",
  "icons": {
    "32": "icons/slp.png",
    "128": "icons/slp-128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "32": "icons/slp.png",
      "128": "icons/slp.png"
    }
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ]
  }
}