It said it keeps bookmarks, preferences, history, etc., but the only thing it deletes is extensions and addons. I did it and that is the only thing I lost were my extensions and my addons. (It also saves a file on your desktop with the old profile in case you need to copy anything from there) I added them all back but now I cannot access Hitscraper. I have tried all 4 links and even double checked that the other Hitscraper with export minus legacy wasn't back on Greasyfork. Everything else is working perfectly.