Examine source code of Web Blocker & Timer

{
  "manifest_version": 3,
  "name": "Web Blocker & Timer",
  "version": "2.3.0",
  "description": "The simplest Web Blocker & Timer. Customizable block modes,  daily time limits,  schedules, and block screens.",
  "permissions": [
    "storage",
    "alarms",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "src/options/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "src/blocked/blocked.html",
        "src/blocked/blocked.js",
        "src/blocked/blocked.css",
        "src/common/theme.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "128": "assets/icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "web-blocker-timer@snraw",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}