code: public String getEditorParameter(CmsObject cms, String editor, String param) {
  
          String path = OpenCms.getSystemInfo().getConfigFilePath(cms, "editors/" + editor + ".properties");
          CmsVfsMemoryObjectCache cache = CmsVfsMemoryObjectCache.getVfsMemoryObjectCache();
          CmsParameterConfiguration config = (CmsParameterConfiguration)cache.getCachedObject(cms, path);
          if (config == null) {
              try {
                  CmsFile file = cms.readFile(path);
                  try (ByteArrayInputStream input = new ByteArrayInputStream(file.getContents())) {
                      config = new CmsParameterConfiguration(input); // Uses ISO-8859-1, should be OK for config parameters
                      cache.putCachedObject(cms, path, config);
                  }
              } catch (CmsVfsResourceNotFoundException e) {
                  return null;
              } catch (Exception e) {
                  LOG.error(e.getLocalizedMessage(), e);
                  return null;
              }
          }
          return config.getString(param, null);
      }
docs: Gets the value of a global editor configuration parameter.
  
  @param cms the CMS context
  @param editor the editor name
  @param param the name of the parameter
  
  @return the editor parameter value