Examine source code of RBLXBlocker

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e4f6eb2-65c0-4379-b9bf-7a47f59c0370}",
      "strict_min_version": "109.0"
    }
  },
  "manifest_version": 3,
  "name": "RBLXBlocker",
  "version": "1.0.1",
  "description": "Block roblox from your browser",
  "content_scripts": [
    {
      "js": [
        "blocking.js"
      ],
      "matches": [
        "*://*.roblox.com/*"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "action": {
    "default_icon": "icon.png",
    "default_popup": "load.html"
  },
  "host_permissions": [
    "*://*/*"
  ]
}