private boolean isURLValid(URL url) {
		InputStream testStream = null;
		try {
			testStream = url.openStream();
			return true; // if the above didn't fail, then the resource can be accessed
		}
		catch (MalformedURLException e) {
			return false; // shouldn't happen as the URL should be valid
		}
		catch (IOException e) {
			return false; // this happens if the resource doesn't exit
		}
		finally {
			if (testStream != null) {
				try {
					testStream.close();
				}
				catch (IOException e) {
					// don't care, we tried to close it
				}
			}
		}
	}
Make sure we can find the help resources that Ghidra will use
Ghidra/Framework/Docking/src/main/java/docking/help/HelpManager.java