gnomerunner/theme/global/tabprompts.css

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Tab Modal Prompt boxes */
tabmodalprompt {
  background-image: url(chrome://global/skin/icons/tabprompts-bgtexture.png);
  background-color: hsla(0,0%,10%,.5);
  font-family: sans-serif; /* use content font not system UI font */
}

.mainContainer {
  color: -moz-fieldText;
  background-color: -moz-field;
  border-radius: 2px;
  border: 1px solid threeDDarkShadow;
}

.topContainer {
  padding: 20px;
}

.buttonContainer {
  padding: 12px 20px 15px;
  background-color: hsla(0,0%,0%,.05);
  border-top: 1px solid hsla(0,0%,0%,.05);
}