Examine source code of Walmart Price Watch

{
  "manifest_version": 2,
  "name": "walmart price watch",
  "version": "1.0.1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "walmart price watch",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ]
}