Firefox placeholder issue

Question

Mozilla Firefox

On the planeta-dez.ru website, if viewed through firefox, the text in the placeholder is not displayed. All other browsers are fine. Help me find where the jamb is. Thank you!

Answer 1

So, not only placeholders are not displayed there. And in general the text in the form.
Remove padding: 20px. The input is 34px high. And that's with padding.
Mathematical problem, how much is left for the contents of the input? The correct answer is, not at all.

Answer 2

if disabled

* {
    -moz-box-sizing: border-box;
}

then everything is OK, and so you have not only a placeholder, but also the text is not visible.
You can also padding: 20pxremove it - it will help too.