Examine source code of PDGA Rating Tools

{
  "manifest_version": 2,
  "name": "PDGA Rating Tools",
  "author": "Ricky Sandoval",
  "version": "1.0.1",
  "description": "Extension to add useful features to the PDGA website's Ratings Detail page for disc golfers ",
  "permissions": [
    "*://*.pdga.com/*",
    "storage",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.pdga.com/player/*/details*"
      ],
      "js": [
        "js/ratings-detail-page.js"
      ],
      "css": [
        "styles/content-script.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "icons/frisbee-16.png",
    "48": "icons/frisbee-48.png",
    "128": "icons/frisbee-128.png"
  }
}