message: `useful-not-found-page`: Show alternate links only if applicable
diff: @@ -145,14 +145,17 @@ async function showAlternateLink(): Promise<void> {
  function init(): false | void {
  const parts = parseCurrentURL();
  - if (parts.length <= 1 || !select.exists('[alt*="This is not the web page you are looking for"]')) {
  + if (parts.length < 2) {
  return false;
  }
  void showMissingPart();
  +
  + if (['tree', 'blob', 'edit'].includes(parts[2])) {
  void showDefaultBranchLink();
  void showAlternateLink();
  }
  +}
  async function initPRCommit(): Promise<void | false> {
  const commitUrl = location.href.replace(/pull\/\d+\/commits/, 'commit');
  