tell me how to delete firefox

I will transfer you request to the Firefox support forum. I would assume they will tell you to follow the application removal instructions provided by your operating system vendor. So I will provide that link for you as google popped it up on the first page. https://support.microsoft.com/en-us/windows/uninstall-or-remove-apps-and-programs-in-windows-4b55f974-2cc6-2d2b-d092-5905080eaf98