      (currentCompletionKeys.indexOf(KeyboardUtils.getKeyChar(event)) != -1 ||
       isValidFirstKey(KeyboardUtils.getKeyChar(event))))
     event.stopPropagation()
+    handledKeydownEvents.push event
 
 onKeyup = (event) ->
   return unless handlerStack.bubbleEvent("keyup", event)
-  # Don't propagate the keyup to the underlying page, since Vimium has handled it. See #733.
-  event.stopPropagation() unless isInsertMode()
+  return if isInsertMode()
+
+  # Don't propagate the keyup to the underlying page if Vimium has handled it. See #733.
+  for keydown, i in handledKeydownEvents
+    if event.metaKey == keydown.metaKey and
+       event.altKey == keydown.altKey and
+       event.ctrlKey == keydown.ctrlKey and
+       event.keyIdentifier == keydown.keyIdentifier and
+       event.keyCode == keydown.keyCode
+
+      handledKeydownEvents.splice i, 1
+      event.stopPropagation()
+      break
 
 checkIfEnabledForUrl = ->
   url = window.location.toString()

      if (isEditable(event.srcElement))
        event.srcElement.blur()
      exitInsertMode()
      DomUtils.suppressEvent(event)

  else if (findMode)
    if (KeyboardUtils.isEscape(event))
      handleEscapeForFindMode()
      DomUtils.suppressEvent(event)

    else if (event.keyCode == keyCodes.backspace || event.keyCode == keyCodes.deleteKey)
      handleDeleteForFindMode()
      DomUtils.suppressEvent(event)

    else if (event.keyCode == keyCodes.enter)
      handleEnterForFindMode()
      DomUtils.suppressEvent(event)

    else if (!modifiers)
      event.stopPropagation()

  else if (isShowingHelpDialog && KeyboardUtils.isEscape(event))
    hideHelpDialog()

  else if (!isInsertMode() && !findMode)
    if (keyChar)
      if (currentCompletionKeys.indexOf(keyChar) != -1)
        DomUtils.suppressEvent(event)

      keyPort.postMessage({ keyChar:keyChar, frameId:frameId })



      false

handledKeydownEvents = []

#
# Sends everything except i & ESC to the handler in background_page. i & ESC are special because they control
# insert mode which is local state to the page. The key will be are either a single ascii letter or a
