Examine source code of Website Updates Tracker

{
  "manifest_version": 2,
  "name": "Website Updates Tracker",
  "version": "1.0",
  "description": "Track updates from your favorite websites",
  "permissions": [
    "storage",
    "tabs",
    "https://*/*",
    "downloads"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "website-tracker@yourdomain.com"
    }
  }
}