Examine source code of Profile Site Guard

{
  "manifest_version": 3,
  "name": "Profile Site Guard",
  "version": "1.0.2",
  "description": "Block or allow websites based on per-profile rulesets.",
  "browser_specific_settings": {
    "gecko": {
      "id": "profile-site-guard@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Profile Site Guard",
    "default_icon": {
      "48": "icons/icon-48.svg"
    }
  },
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "blocked.html",
        "blocked.css",
        "blocked.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}