Examine source code of URL Tracker

{
  "manifest_version": 2,
  "name": "URL Tracker - by guelfoweb",
  "version": "1.0",
  "description": "Track all URLs navigated in the active tab",
  "icons": {
    "48": "icons/icon-tracking-on-48.png",
    "96": "icons/icon-tracking-on-96.png"
  },
  "permissions": [
    "webRequest",
    "webNavigation",
    "<all_urls>",
    "tabs",
    "storage",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-tracking-off-48.png",
      "96": "icons/icon-tracking-off-96.png"
    },
    "default_title": "URL Tracker: Disabled (click to enable)",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "url-tracker@example.com",
      "strict_min_version": "58.0"
    }
  }
}