Easy to use but want it to be more functional

I really like the application, but can you please tell me if there is any way to remove the Clear button? Theres no need for that button because maybe someone click it from mistake and he lose everything... I done it first time, thinking that it is Close button, being in a hurry... it happens. I tried to remove the button by changing the userchrome.css from firefox, but it is not working...