Java Web Start is no longer supported by Oracle, and Firefox has removed support for Java applets and plugins. This means you cannot enable Java Web Start in Firefox.
Alternatives:
- Use a different browser: Consider using a browser that still supports Java, such as Internet Explorer or a legacy version of Firefox.
- Use a Java application: If the application you're trying to access is available as a standalone Java application, you can download and install it directly.
- Contact the application developer: Reach out to the developers of the application to see if they offer alternative ways to access it.
Conclusion:
Unfortunately, you cannot enable Java Web Start in Firefox. While there are alternatives, the best solution is to contact the application developer and see if they have a solution for accessing their application without Java Web Start.