My OS is El Capitan and I have been using Disk Doctor for a couple of years. My web browser is Firefox 41.0.2 and to my surprise while cleaning the evening of Oct 22 2015, the same day Disk Doctor updated,.. the Firefox Profile disappeared and the following morning while trying to launch it I was given the error msg that it had been corrupted or deleted. I had to uninstall Firefox, reinstall and also reinstall all my add ons. At this point I was not aware it was Disk Doctor that had caused the problem until the following evening after using Disk Doctor I decided to go back online to check something and again the Profile Error !! Along with the reinstalling you have to import all your Bookmarks etc.which means unless you have all the same on Safari as you had on Firefox you lose all kinds of links ! I uninstalled Disk Doctor, having realized it was the root of the problem. I again had to go through uninstalling and installing Firefox and reinstalling all add ons, bookmarks, data etc. Disk doctor has been an app that I found excellent for cleaning, but with this update it is unusable for me and I will use CleanMyMac 2, it is slower, but it has never caused any problems. If you are using Firefox don’t touch this app with a 10 foot pole………...