Firefox has a very annoying feature. It remembers the state of input fields when you hit F5. It\'s not just the value, it remembers even whether the input is disabled or not.
But to reset your input to its original value, try this.
$('document').ready(function(){//or whenever you want to fire back to the default value
$('input#withanidplease').val($('input#withanidplease').prop('defaultValue'))
})