Yesterday I updated Ghostery to version 7.3.3.7 (in Firefox 55.0.3) and luckily it seems that the developer has fixed the delay and hang issues. Startup is fast again and Firefox is immediately ready for use - at least on my Mac, and I always startup with a blank page, not with zillions of tabs open. So Ghostery is back on my list of must-have add-ons. Good job!