Examine source code of Productivity Timer V2

{
  "manifest_version": 2,
  "name": "Productivity Timer V2",
  "version": "1.3",
  "description": "Stay focused using a Pomodoro-style productivity timer with customizable settings.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1669e443-270f-4c0c-aafb-005c69bd7b8a}"
    }
  }
}