Examine source code of WorkSpot Tab Manager

{
  "manifest_version": 2,
  "name": "WorkSpot Tab Manager",
  "version": "3.1.7",
  "icons": {
    "16": "/icon/16.png",
    "32": "/icon/32.png",
    "48": "/icon/48.png",
    "128": "/icon/128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f413d19-310b-4186-8a04-cfd968a6229b}"
    }
  }
}