The quickest fix is usually to uninstall the Roblox app or disable the Roblox player startup entry , since Fishstrap is likely handing launches off to the installed client instead of the browser version.

What to try

  1. Uninstall the Roblox app from Windows, then open Roblox from the website again.
  1. Open Task Manager, go to the Startup apps tab, find Roblox Player, and disable it if it appears there.
  1. Try launching Roblox in an incognito window or a different browser to see whether the handoff is being forced by your browser/session.
  1. If Fishstrap settings include launch or install behavior, check whether it is configured to prefer the installed client, since Fishstrap is a Bloxstrap fork and can affect how Roblox launches.

Why this happens

Some Roblox launchers and browser links are set up to open the native app automatically, so even if you start from the website, the system routes the launch to the installed Roblox client. If the app is still installed and registered as the default handler, the browser version may never get a chance to open.

If it still opens

  • Remove and reinstall Roblox after uninstalling Fishstrap, then test the website launch again.
  • Check Fishstrap’s own troubleshooting notes and settings for any launch-related options or reinstall behavior that could be affecting startup.

TL;DR

Uninstall Roblox or disable its startup/handler entry, then try the website again; that usually stops Fishstrap-related automatic app launching.