The original PC has died but the hard drive is ok. The old pc was windows 8.1. Firefox was updated as and when automatically. The new PC is also windows 8.1. The old hard drive has been put in a caddy and we can access all the files fine and we have found the old profile in the user /roaming/appdata etc area. I obviously did not have the luxury of using the tool to do a backup. We have installed the latest Firefox on the new machine and we have found the profile generated as part of the new install. We have followed pretty well all the various instructions for copying the contents of the old profile onto the profile on the new machine but it is not recognized and none of the data is visible in Firefox. I have made sure that the contents of the profile.ini file is indicating the 'new' profile. The Profile manager does not find the New profile. I know that I have transferred profiles between machines the past without problems - and I at my wits end with this. What I need is a foolproof (I feel a fool right now because nothing seems to work) to get the original profile (still on the old hard drive) on to the new machine. What is really needed is a selection field on one of the Options tabs to point at the profile so that it can be picked up. I only want one profile . Any suggestions gratefully received.