/* 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/. */ .popup-anchor { /* should occupy space but not be visible */ opacity: 0; pointer-events: none; position: absolute; } :root[chromehidden~="location"] #header { display: none }