At least, I think I followed all the instructions. After I created the new profile, I went to the section that reads: Important: Firefox must be closed down while copying files between profile folders. Also, Step 1 refers to your "old" profile folder - the profile containing data you want to copy to a new profile. If you can't open a profile from within Firefox, see Finding your profile without opening Firefox. I found this instruction a little irritating—if in step one "profile" means "old profile folder," then why not say so? But the big problem is that, with the warning that Firefox must be closed down, I closed FF. Then I came across this: Open your profile folder: From the Help menu, choose Troubleshooting Information. The Troubleshooting Information tab will open. Under the Application Basics section, click on Show in Finder . A window will open that contains your profile folder. Well, these instructions forced me to open Ff again—but to my dismay, when I went to the Application Basics section, and looked at Show in Finder, it wasn't my old profile that showed, but my new one. Since I only found my old profile picture in the first place by following the same instructions to go to Application Basics when I was told to make a copy of the old profile, which was at that time my current profile, I only got to that profile because it opened automatically—I didn't remember the path, so I don't know how to find it. But since I did make a copy of it to my external hard drive, I opened my Old Profile from there. Then this: Click the Firefox menu at the top of the screen, then click Quit Firefox. So I quit FF. Then this: Hold down the control key while you click on a file you want to copy and choose Copy. Open the new Firefox profile folder. I found this confusing; why in the world would I be told to click on a file to copy before I was told to open the new profile? And where WAS the new profile? So I opened FF again, went to Application Basics, and then opened the new profile, then closed FF again. So I was once more at this step: Hold down the control key while you click on a file you want to copy and choose Copy. But it occurred to me that, rather than repeat this step for each individual item, why not just drag the first sub-folder from the Old Profile to the New One? I tried that, but got a message saying that the folder was invisible, so I selected everything in that folder and just dragged it into the new profile. I clicked on everything in the second sub-folder in the Old Profile, but when I dropped the selection in the New Profile, I got a message saying that there were copies, so I stopped. Since I didn't know why there were two sub-folders in the Old Profile, I thought that, in order to make sure that everything from the Old Profile Folder was in the NPF, I created two sub-folders in the NPF, one entitled "0 untitled" and the other "O untitled 2." Then I selected and dragged everything that I had transferred from the first sub-folder of the OPF into the NPF *before* I had created sub-folders for the NPF, and I dragged them into "0 untitled." Then I revisited the second sub-folder of the OPF, selected its contents, then dragged and dropped them into the NPF sub-folder "0 untitled 2." When I got to the section "Your important data and their files," I was a little confused, because at first I thought I had to transfer these manually because they were not in the OPF, so I searched for them, but when I selected the "places.sqlite" and tried to drag and drop it, I got a message asking whether I wished to delete the file from the Cloud—since I didn't, I didn't. Finally it occurred to me that perhaps they were in the OPF, so I looked, and they were. The article ends without any instructions as to what to do once you have finished transferring files from the OPF to the NPF, so I simply clicked on FF, which opened without the data. I closed FF, then shut down and restarted my computer, but when I opened FF, still no data. I thought perhaps that I had been wrong to drag and drop, so I opened the copy of my OPF on my external hard drive, then opened FF again t the Application Basics so that I could open the NPF in the finder. When the NPF opened, I was surprised to see that the two sub-folders no longer had the titles I gave them, but had rather the strange string of numbers and letters reminiscent of the names of the invisible folders in the OPF. Should I create another new profile folder and then go through the laborious process of selecting one file, clicking copy, then going into the NPF, without the sub-folders, and then click "Paste"? If I do that for one sub-folder from the OPF, should I create a first sub-folder for the NPF, and then put all the laboriously transferred files from the first sub-folder of the OPF into the new first sub-folder of the NPF, and then repeat that process when I transfer the files laboriously one by one from the second sub-folder of the OPF into the NPF? I am at a loss, and would appreciate help.