Examine source code of RotoBaller Team Sync

{
  "name": "RotoBaller Team Sync",
  "description": "Import your fantasy team rosters and sync your leagues. Get custom tools and advice based on your specific teams and settings.",
  "manifest_version": 2,
  "version": "4",
  "author": "LineupExperts",
  "homepage_url": "https://www.lineupexperts.com",
  "icons": {
    "16": "icons/rb-icon-16.png",
    "48": "icons/rb-icon-48.png",
    "64": "icons/rb-icon-64.png",
    "96": "icons/rb-icon-96.png",
    "128": "icons/rb-icon-128.png"
  },
  "background": {
    "scripts": [
      "lodash.js",
      "browser-polyfill.js",
      "worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.espn.com/*",
        "*://*.fantrax.com/*",
        "*://*.cbssports.com/*",
        "*://*.fantasysports.yahoo.com/*",
        "*://*.nfl.com/*",
        "*://*.fleaflicker.com/*",
        "*://*.sleeper.com/*",
        "*://*.myfantasyleague.com/*",
        "*://*.myffpc.com/*",
        "*://*.rtsports.com/*",
        "*://*.onroto.com/*",
        "*://*.shgn.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "lodash.js",
        "ping.js"
      ]
    },
    {
      "matches": [
        "*://*.lineupexperts.com/*",
        "*://*.fssync.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "lodash.js",
        "ping.js",
        "cs_lue.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "page_console_intercept.js",
    "page_console_lue.js",
    "page_lue.js",
    "page_lue_ready.js",
    "page_console_yahoo.js",
    "page_cbssports.js"
  ],
  "permissions": [
    "storage",
    "alarms",
    "cookies",
    "*://*.rotoballer.com/*",
    "*://*.lineupexperts.com/*",
    "*://*.fssync.com/*",
    "*://*.espn.com/*",
    "*://*.fantrax.com/*",
    "*://*.yahoo.com/*",
    "*://*.yahooapis.com/*",
    "*://*.cbssports.com/*",
    "*://*.nfl.com/*",
    "*://*.fleaflicker.com/*",
    "*://*.sleeper.com/*",
    "*://*.sleeper.app/*",
    "*://*.myfantasyleague.com/*",
    "*://*.myffpc.com/*",
    "*://*.rtsports.com/*",
    "*://*.onroto.com/*",
    "*://*.shgn.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension-rotoballer@lineupexperts.com"
    }
  }
}