gecko-dev/toolkit/pluginproblem/content/pluginProblemBinding.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/. */

@namespace url(http://www.w3.org/1999/xhtml); /* set default namespace to HTML */

embed:-moz-handler-disabled,
embed:-moz-handler-blocked,
embed:-moz-handler-crashed,
embed:-moz-handler-clicktoplay,
embed:-moz-handler-vulnerable-updatable,
embed:-moz-handler-vulnerable-no-update,
applet:-moz-handler-disabled,
applet:-moz-handler-blocked,
applet:-moz-handler-crashed,
applet:-moz-handler-clicktoplay,
applet:-moz-handler-vulnerable-updatable,
applet:-moz-handler-vulnerable-no-update,
object:-moz-handler-disabled,
object:-moz-handler-blocked,
object:-moz-handler-crashed,
object:-moz-handler-clicktoplay,
object:-moz-handler-vulnerable-updatable,
object:-moz-handler-vulnerable-no-update {
    display: inline-block;
    overflow: hidden;
    opacity: 1 !important;
    -moz-binding: url('chrome://pluginproblem/content/pluginProblem.xml#pluginProblem') !important;
}