Examine source code of Browser Lock Timer

{
  "manifest_version": 2,
  "name": "Browser Lock Timer",
  "version": "1.0",
  "description": "Lock your browser for a specified duration to stay focused",
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "webNavigation",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "phyothetpai37@gmail.com",
      "strict_min_version": "58.0"
    }
  }
}