Examine source code of Exam Timer

{
  "manifest_version": 2,
  "name": "Exam Timer",
  "version": "1.3",
  "description": "A simple countdown timer to help you track exam duration and stay focused.",
  "permissions": [
    "storage",
    "notifications"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Exam Timer"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42f4348f-c45a-4272-ae4e-9c08e6f6cee5}"
    }
  }
}