Firefox browser settings placeholder remember to change opacity

Recent projects involve the need to modify the placeholder font color of the input box, my CSS is as follows:

::-webkit-input-placeholder{
Color: #c5c5c5;
}
::-moz-placeholder{
Color: #c5c5c5;
opacity:1;/* here is not before, found the problem only added to the * *
}
:-ms-input-placeholder{
Color: #c5c5c5;
}

So the question is, what's wrong with Firefox, and then you find this thing by debugging?

See no, the default has a transparency, my days, ugly dead, do not like, or custom is better, then we are in the custom CSS inside the Firefox section Plus

Opacity:1;

Just fine.

Firefox browser settings placeholder remember to change opacity