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/usr/lib/thunderbird-addons/extensions/{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}/chrome/gdata-provider/skin/gdata-bindings.css is in xul-ext-gdata-provider 1:52.7.0+build1-0ubuntu1.

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/* 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/. */

calendar-list-tree[type="gdata"] {
  -moz-binding: url(chrome://gdata-provider/content/gdata-list-tree.xml#gdata-list-tree);
}

calendar-list-tree > tree > treechildren::-moz-tree-image(checkbox-treecol, disabled) {
    list-style-image: none !important;
}

calendar-list-tree > tree > treechildren::-moz-tree-cell(color-treecol, disabled) {
    background-color: transparent !important;
}

calendar-list-tree > tree > treechildren::-moz-tree-image(status-treecol, readonly) {
    list-style-image: none;
}
calendar-list-tree > tree > treechildren::-moz-tree-cell-text(readonly) {
    opacity: 0.4;
}