Examine source code of Plutio

{
  "manifest_version": 2,
  "name": "Plutio",
  "description": "The Official Plutio Extension",
  "version": "4.0",
  "browser_action": {
    "default_icon": "plutio.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "plutio16.png",
    "22": "plutio22.png",
    "32": "plutio32.png",
    "48": "plutio48.png",
    "128": "plutio128.png"
  },
  "background": {
    "scripts": [
      "liveTimer.js",
      "trackTime.js",
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "identity",
    "storage",
    "https://app.plutio.com/signin/authorize?app_id=CwtBod3Y8cXRAu4FZ",
    "https://www.plutio.com/*",
    "https://www.app.plutio.com/*"
  ]
}