Examine source code of Underdog BestBall Overlay

{
  "manifest_version": 2,
  "name": "Underdog Exposure Overlay",
  "version": "3.6.0",
  "description": "Overlays your exposure % on Underdog Fantasy draft boards. Navigate to any exposure page and click Scrape.",
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "https://*.underdogfantasy.com/*",
    "https://*.underdogsports.com/*",
    "https://api.underdogfantasy.com/*",
    "https://api.underdogsports.com/*",
    "https://extensionpay.com/*",
    "https://www.google-analytics.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.underdogfantasy.com/*",
        "https://*.underdogsports.com/*",
        "https://app.underdogfantasy.com/*",
        "https://app.underdogsports.com/*"
      ],
      "js": [
        "debugger_bypass.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://*.underdogfantasy.com/*",
        "https://*.underdogsports.com/*",
        "https://app.underdogfantasy.com/*",
        "https://app.underdogsports.com/*"
      ],
      "js": [
        "ExtPay.js",
        "content.js"
      ],
      "css": [
        "overlay.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Underdog Exposure Overlay",
    "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": "underdog-exposure-overlay@extension",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}