Examine source code of Exploding Tabs

{
  "manifest_version": 2,
  "name": "Exploding Tabs",
  "version": "1.3",
  "author": "Kerem Kayabay",
  "description": "A browser extension to set up a countdown timer for addictive sites.",
  "icons": {
    "32": "icons/bomb-solid-32.png",
    "48": "icons/bomb-solid-48.png",
    "96": "icons/bomb-solid-96.png"
  },
  "permissions": [
    "tabs",
    "notifications",
    "storage",
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/bomb-solid-96.png",
    "default_title": "Exploding Tabs",
    "default_popup": "popup/exploding-tabs.html"
  },
  "page_action": {
    "default_icon": "icons/stopwatch-solid-48.png",
    "default_title": "Stop countdown"
  },
  "background": {
    "scripts": [
      "coordinator.js"
    ]
  }
}