I followed the instructions to backup my profile. I rebuilt my system. Now I'm trying to restore. I did the install and tried to bring back the backup profile, it didn't work or even see it. So I deleted the other profile and left the backup one that I put in the same location as instructed. Not only didn't it work, it wouldn't even open. I ran the uninstall and tried to reinstall, as the website said. Now it says it installed but hasn't. It no longer shows up in the programs under control panel and says: "Your Firefox profile cannot be loaded. It may be missing or inaccessible." So now I don't have Firefox at all.