Examine source code of Time Tracker Multi-Tab

{
  "manifest_version": 2,
  "name": "Admin Time Tracker Multi-Tab",
  "version": "3.1",
  "description": "Traccia il tempo speso su più URL con backup globale.",
  "browser_specific_settings": {
    "gecko": {
      "id": "multitabtimetracker@yourdomain.com",
      "strict_min_version": "58.0"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "idle",
    "<all_urls>",
    "unlimitedStorage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "web_accessible_resources": [
    "import.html"
  ]
}