Examine source code of Study Nook - Pomodoro Timer

{
  "manifest_version": 3,
  "name": "Study Nook — Pomodoro Timer",
  "version": "1.0.0",
  "description": "A cozy pomodoro timer with a little study buddy who works at the desk and grabs coffee on your breaks.",
  "browser_specific_settings": {
    "gecko": {
      "id": "study-nook@vRizon",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "alarms",
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Study Nook",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "sidebar_action": {
    "default_panel": "popup.html",
    "default_title": "Study Nook",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}