gecko-dev/toolkit/themes/qute/mozapps/extensions/about.css

#clientBox {
  background-color: #FFFFFF;
  color: #000000;
}

#extensionName {
  font-size: large;
  font-weight: bold;
}

#extensionVersion {
  font-weight: bold;
  color: #909090;
}

#extensionHomepage {
  color: #0000FF;
  text-decoration: underline !important;
  cursor: pointer;
}

#genericAbout {
  padding: 0px 0px 10px 0px;
  min-height: 200px;
  width: 30em;
}

#groove {
  margin-top: 0px;
}

#clientBox {
  padding: 10px;
} 

#extensionDescription {
  color: #404040;
}

#extensionDescription, #extensionContributors, #creatorBox, #contributorsBox {
  margin-left: 6px;
}

#extensionCreator, .contributor {
  margin: 0px;
} 

#extensionCreatorLabel, #extensionContributors {
  border-top: 2px solid #C0C0C0;
  padding: 2px 0px 3px 0px;
  margin-top: 3px;
  font-weight: bold;
}