public void changeHighlighter(Highlighter hl) {
		if (highlightService == null) {
			// if not setup, ignore the change request.
			return;
		}

		CTokenHighlightMatcher matcher =
			hl.equals(Highlighter.LABELS) ? new TaintLabelHighlighter() : new VertexHighlighter();
		taintProvider.setHighlighter(highlightService, matcher);
	}
Change the highlighter (token matcher and colors used) to the designated highlighter IF:
<ul><li>
the highlight service has been established.
</li><li>
the highlighter instance has been instantiated and added to the decompHighlighters map.
</li></ul>

@param hl - highlighter
Ghidra/Features/DecompilerDependent/src/main/java/ghidra/app/plugin/core/decompiler/taint/TaintPlugin.java