Examine source code of Spider Sense

{
  "manifest_version": 2,
  "name": "Spider Sense",
  "version": "0.2",
  "description": "Spider Sense helps Spider developers working with Scrapy Cloud monitor jobs.",
  "homepage_url": "https://github.com/realslimshanky/Spider-Sense",
  "icons": {
    "128": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup/spider_sense.html",
    "default_title": "Spider Sense"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background-script.js"
    ]
  },
  "permissions": [
    "storage",
    "notifications"
  ]
}