message: remove a line for debug
diff: @@ -269,7 +269,6 @@ document.addEventListener('pagerendered', (evPageRendered) => {
  }, true)
  const setHistory = () => {
  - console.log('history click')
  const container = document.getElementById('viewerContainer')
  // set positions before and after clicking to viewerHistory
  viewerHistory.set(container.scrollTop)
  