Examine source code of Drum Rudiments Extension

{
  "manifest_version": 3,
  "name": "Drum Rudiments Extension",
  "version": "1.0.3",
  "description": "A helpful extension for drumrudiments.app. Reminders, tips and tricks for drummers.",
  "browser_specific_settings": {
    "gecko": {
      "id": "no-reply@drumrudiments.app",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "notifications",
    "alarms",
    "idle"
  ],
  "host_permissions": [
    "https://*/*",
    "http://*/*"
  ],
  "background": {
    "service_worker": "src/background/background.js",
    "scripts": [
      "src/background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "32": "assets/icons/icon32.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "32": "assets/icons/icon32.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  }
}