Examine source code of Website Cutoff

{
  "manifest_version": 3,
  "name": "Website Cutoff",
  "version": "0.4.0",
  "description": "Blocks website access to a custom list after hitting a number of visits. Tracks visit counts and time spent as local data.",
  "browser_specific_settings": {
    "gecko": {
      "id": "website-cutoff@davidgreenwald.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "alarms",
    "idle"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "Website Cutoff",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "blocked/blocked.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}