If you have more than one copy of React DevTools installed and enabled (e.g. the version in the Chrome store and a locally built version) they can interfere with each other.

DevTools should detect this case and warn by showing a dialog in the DevTools UI and/or by logging to the console.

Note that we _should not warn_ if a related tool like Fast Refresh is present, only another copy of DevTools.
if (container._hasInitialHTMLBeenCleared) {
            return;
          }
          container.innerHTML = '';
          container._hasInitialHTMLBeenCleared = true;
        }
        function setBrowserSelectionFromReact() {
          
          
          
          chrome.devtools.inspectedWindow.eval(
            '(window.__REACT_DEVTOOLS_GLOBAL_HOOK__.$0 !== $0) ?' +
              '(inspect(window.__REACT_DEVTOOLS_GLOBAL_HOOK__.$0), true) :' +
              'false',
            (didSelectionChange, evalError) => {
              if (evalError) {
                console.error(evalError);
              }
            },
          );
        }
        function setReactSelectionFromBrowser() {