Examine source code of Parental Whitelist Control

{
  "manifest_version": 2,
  "name": "Parental Whitelist Control",
  "browser_specific_settings": {
    "gecko": {
      "id": "parental-whitelist@control.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "version": "1.6.0",
  "description": "A parental control extension that only allows access to allowed websites. PIN protected with auto-lock, activity tracking, and easy setup.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "storage",
    "tabs",
    "menus",
    "notifications",
    "<all_urls>"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+A"
      }
    }
  },
  "incognito": "spanning",
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "src/icons/icon16.png",
      "48": "src/icons/icon48.png",
      "128": "src/icons/icon128.png"
    },
    "default_title": "Parental Whitelist Control",
    "default_area": "navbar"
  },
  "icons": {
    "16": "src/icons/icon16.png",
    "48": "src/icons/icon48.png",
    "128": "src/icons/icon128.png"
  },
  "options_ui": {
    "page": "src/options.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "src/blocked.html",
    "src/blocked.js"
  ]
}