Hi

This article will walk you through how to delete your Firefox Account.

https://support.mozilla.org/en-US/kb/how-do-i-delete-my-firefox-account

I hope this helps, but if not, please come back here and we will try to understand what has happened.

After I use delete button I did password,but rouse button delete do not work

I did all

What happens when you select the option to delete your account?

The more information that you can give us, the better able we are to hopefully find a solution for you.