This launcher is for testing purposes so that FIASCO tests the complete user flow including the close button functionality in a way that simulates the intended production behavior.
Because modern browsers implement strict security policies that prevent websites from closing windows they didn't open.
When using this launcher, the application window is opened programmatically usingwindow.open(). This establishes a relationship between the opener and the new window, granting the new window permission to close itself withwindow.close().
If a user navigates directly to the application URL (without using this launcher), the browser has no record of the window being opened by JavaScript, and will block any attempt to use window.close() for security reasons.