@Override
		public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel,
				boolean expanded, boolean leaf, int row, boolean isFocused) {

			CustomFavoritesCellRenderer renderer =
				(CustomFavoritesCellRenderer) super.getTreeCellRendererComponent(tree, value, sel,
					expanded, leaf, row, isFocused);

			Object o = ((DefaultMutableTreeNode) value).getUserObject();
			FavoritesItem item = (FavoritesItem) o;
			if (item == null) {
				return renderer;
			}

			HelpSet helpSet = helpModel.getHelpSet();
			Map combinedMap = helpSet.getCombinedMap();
			URL URL = getURL(item, helpSet, combinedMap);
			if (URL == null) {
				// should only happen if the user has old favorites; trust the old name
				return renderer;
			}

			String text = URL.getFile();
			int index = text.lastIndexOf('/');
			if (index != -1) {
				// we want just the filename
				text = text.substring(index + 1);
			}

			String ref = URL.getRef();
			if (ref != null) {
				text += "#" + ref;
			}

			renderer.setText(item.getName() + " - " + text);

			return renderer;
		}
This class allows us to change the renderer of the favorites tree.
Ghidra/Framework/Help/src/main/java/help/CustomFavoritesView.java