Changing the signature color

[Holger Metzger]

How can I change the signature color in Mozilla?

I tried

.moz-txt-sig, .moz-signature {
  color: red !important;
  }
.moz-txt-sig > a, .moz-signature > a {
  color: CC0033 !important;
  }

in userContent.css, but it didn't work.

- Holger