private static List<String> getPluginPathList() {
		String path = properties.getProperty(USER_PLUGIN_PATH);
		if (path == null) {
			return null;
		}

		List<String> list = new ArrayList<>(5);

		StringTokenizer st = new StringTokenizer(path, File.pathSeparator);
		while (st.hasMoreElements()) {
			String p = (String) st.nextElement();
			list.add(p);
		}
		return list;
	}
Set the paths to be used as the UserPluginPath property.
@param paths the paths
Ghidra/Framework/Generic/src/main/java/ghidra/framework/preferences/Preferences.java