Examine source code of Roblox UI+

{
  "name": "Roblox UI+",
  "version": "1.0.1",
  "description": "A new extension that gives Roblox a nicer UI.",
  "manifest_version": 3,
  "icons": {
    "1080": "logo.png"
  },
  "permissions": [
    "storage",
    "scripting",
    "tabs"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "styles.css"
      ],
      "matches": [
        "*://*.roblox.com/*"
      ]
    },
    {
      "resources": [
        "normalize.css"
      ],
      "matches": [
        "*://*.roblox.com/*"
      ]
    },
    {
      "resources": [
        "jquery-3.6.4.min.js"
      ],
      "matches": [
        "*://*.roblox.com/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.roblox.com/*"
      ],
      "js": [
        "jquery-3.6.4.min.js",
        "inject.js"
      ]
    }
  ],
  "host_permissions": [
    "*://*.roblox.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@sietsegaming.ml",
      "strict_min_version": "42.0"
    }
  }
}