The new version does not play nicely with other extensions & open tabs and has become very inefficient. It's hogging all the Firefox 57 cpu cycles so Firefox and every page I have open is unresponsive while its running. Once it finishes (after 15 minutes now instead of 90 sec) everything is back to normal. While its updating, Firefox become completely unusable. I don't like the new menu - there's not enough control. And upgrading was a pain, with having to export & reimport which seems unnecessarily pointless.