Versuch mal folgendes
CSS
tree[seltype="cell"] > treechildren::-moz-tree-line,
tree[seltype="text"] > treechildren::-moz-tree-line,
treechildren::-moz-tree-line {
display: none !important;
}
tree[seltype="cell"] > treechildren::-moz-tree-line(active, selected, focus),
treechildren::-moz-tree-line(selected, focus) {
display: none !important;
}
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