When I drag drop a message to Firefox it is moved to “Deleted Items”

• Make sure you update Firefox to the latest version
• Reset Firefox to default settings:
  In the address bar type or paste: about:support
  > Enter/Return
  > Click the button: refresh Firefox
• Advanced option:
  In the address bar type or paste: about:config
  > Enter/Return
  > Click the button promising to be careful
  > In the search box above the list, type or paste autos and pause while the list is filtered
  > Double-click the browser.tabs.remote.autostart.2 preference to switch the value from false to true
• A workaround for this issue is pressing ctrl while drag & dropping the message