Examine source code of Roblox URL Launcher

{
  "manifest_version": 2,
  "name": "Roblox URL Launcher",
  "version": "1.12",
  "description": "Joins a game, specific server or opens studio basing on url parameters.",
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "*://*.roblox.com/home*",
        "*://*.roblox.com/games*",
        "*://*.roblox.com/groups*"
      ],
      "run_at": "document_end",
      "js": [
        "index.js"
      ]
    }
  ],
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "128": "128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a166f56-63c9-4731-9f4c-2b07af827b79}"
    }
  }
}