Examine source code of SportsHUD Extension

{
  "manifest_version": 2,
  "name": "Sports HUD",
  "version": "2.5.2",
  "description": "Sports HUD",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Sports HUD"
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://sportsbook.draftkings.com/*",
        "*://*.underdogfantasy.com/*",
        "*://*.superdraft.io/*",
        "*://*.prizepicks.com/*",
        "*://*.drafters.com/*",
        "*://*.draftkings.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "applications": {
    "gecko": {
      "strict_min_version": "53.0",
      "id": "{f0cedb33-c146-411e-bfd3-59a12a79e5fb}"
    }
  },
  "web_accessible_resources": [
    "external/*"
  ],
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "identity",
    "<all_urls>",
    "unlimitedStorage"
  ]
}