@Override
		public void installUI(JComponent c) {
			super.installUI(c);

			tree.addKeyListener(new KeyAdapter() {
				@Override
				public void keyReleased(java.awt.event.KeyEvent e) {
					if (e.getKeyCode() == KeyEvent.VK_DELETE ||
						e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {

						removeAction.actionPerformed(null);
					}
				}
			});

			// Note: add a listener to fix the bug described in 'idChanged()' below
			HelpModel model = favorites.getModel();
			titleListener = e -> {

				if (lastIdEvent == null) {
					return;
				}

				currentTitle = (String) e.getNewValue();
				if (currentTitle == null) {
					return;
				}

				String lastTitle = lastIdEvent.getHistoryName();
				if (!currentTitle.equals(lastTitle)) {
					resendNewEventWithFixedTitle(lastIdEvent, currentTitle);
				}
			};

			model.addPropertyChangeListener(titleListener);
		}
This class allows us to change the renderer of the favorites tree.
Ghidra/Framework/Help/src/main/java/help/CustomFavoritesView.java