Examine source code of Pomodoro Timer

{
  "manifest_version": 3,
  "name": "Pomodoro Timer",
  "version": "1.2",
  "description": "A stunning, offline-first Pomodoro timer for productivity.",
  "homepage_url": "https://github.com/virejdasani/pomodoro-timer",
  "icons": {
    "16": "assets/icons/icon-16.png",
    "32": "assets/icons/icon-32.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "action": {
    "default_icon": "assets/icons/icon-32.png",
    "default_title": "Pomodoro Timer"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pomodoro-timer@virejdasani.github.io",
      "strict_min_version": "109.0"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*",
        "main-tab/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}