Examine source code of pTabManager

{
  "manifest_version": 2,
  "name": "Tab Manager",
  "description": "A simple tab manager",
  "version": "1.0.4",
  "icons": {
    "48": "icon.png",
    "96": "icon.png",
    "192": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "https://ajax.googleapis.com/",
    "tabs",
    "storage",
    "contextualIdentities",
    "cookies",
    "bookmarks"
  ]
}