Examine source code of Time Guard

{
  "manifest_version": 2,
  "name": "Time Guard",
  "version": "0.2.8",
  "description": "Parental control extension for managing children's daily screen time and website access with smart blocking features.",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "author": "p3lo",
  "homepage_url": "https://github.com/p3lo",
  "permissions": [
    "storage",
    "tabs",
    "alarms",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4646d3b-0f99-468d-9428-2a18cbb11962}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "overlay.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_page": "options.html",
  "browser_action": {
    "default_title": "Time Guard",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "blocked.html",
    "blocked.css"
  ]
}