palemoon-dev/platform/devtools/client/webconsole/net/net-request.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/. */

/******************************************************************************/
/* General */

:root {
  --net-border: #d7d7d7;
}

:root.theme-dark {
  --net-border: #5f7387;
}

/******************************************************************************/
/* Network log */

/* No background if a Net log is opened */
.netRequest.message.opened,
.netRequest.message.opened:hover {
  background: transparent !important;
}

/******************************************************************************/
/* Themes */

.theme-dark .netRequest.opened:hover,
.theme-dark .netRequest.opened {
  background: transparent;
}

.theme-firebug .netRequest.message.opened:hover {
  background-image: linear-gradient(rgba(214, 233, 246, 0.8), rgba(255, 255, 255, 1.6)) !important;
}