private void browseExternalLink(HyperlinkEvent e) {
		String description = e.getDescription();
		if (!Desktop.isDesktopSupported()) {
			Msg.info(this, "Unable to launch external browser for " + description);
			return;
		}

		try {
			//  use an external browser
			URI uri = e.getURL().toURI();
			Desktop.getDesktop().browse(uri);
		}
		catch (URISyntaxException | IOException e1) {
			Msg.error(this, "Error browsing to external URL " + description, e1);
		}
	}
A mapping of known style sheet colors to convert from the values in the style sheet to colors
defined in the system theme.
Ghidra/Framework/Help/src/main/java/help/GHelpHTMLEditorKit.java