Examine source code of Pomodorooo

{
  "manifest_version": 2,
  "name": "Pomodorooo",
  "version": "1.1.0",
  "description": "8-bit Pomodoro timer with focus sessions, breaks, notifications, and sounds.",
  "author": "Julián",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_title": "Pomodorooo",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "shared/constants.js",
      "shared/storage.js",
      "background/background.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "permissions": [
    "storage",
    "notifications",
    "alarms",
    "tabs"
  ],
  "web_accessible_resources": [
    "sounds/*.wav",
    "about/about.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "pomodorooo@extension",
      "strict_min_version": "68.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}