Examine source code of Price Tracker

{
  "manifest_version": 2,
  "name": "Price Tracker",
  "version": "1.0",
  "description": "Track product prices and get notified when prices drop.",
  "permissions": [
    "activeTab",
    "storage",
    "notifications",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Track Prices",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{91e4014f-997b-45c4-b2d0-62b11ad24a8d}"
    }
  }
}