How to clear iPad browser history

2921-8-16 iPad Firefox forget download history:
  Summary: 3-line menu -> Settings -> Data Management -> Clear Private Data -> O
  click 3-line menu at top-right, then click Settings;
  scroll down, click "Data Management";
  click "Clear Private Data", get warning popup, click "OK".
  This should make Firefox forget all its download history,
  so it'll reload the latest version of files.