Moving your firefox profile after a clean install of Windows 10

After the awesome flawless upgrade to Windows 10, and knowing that I can now do a clean install and still have windows 10 activate afforded the re-install.

However an excellent question to ask is 'moving your firefox profile after a clean install of Windows 10'. You want all your extensions, bookmarks etc to come over, not just your bookmarks.

Hunting on the internet didn't yield much. Most options revolved around exporting the JSON file for your book marks. This information probably does exist somewhere but here it is anyway.

First go to the drive your windows is sitting on (Windows 7 and up). Head to <your windows system drive>:\Users\<your user>\AppData\Roaming\Mozilla\Firefox\Profiles
You will see a cryptic looking folder inside looking something like z8h0c3kh.default
Make a backup of that folder. The cryptic looking name will be important later on.

Perform a clean install of Windows 10, then install Mozilla Firefox. Run Firefox at least once and exit.

Go to the same folder as above: <your windows system drive>:\Users\<your user>\AppData\Roaming\Mozilla\Firefox\Profiles

Copy the backup you made earlier into that folder.

Now go back one level so you are at: <your windows system drive>:\Users\<your user>\AppData\Roaming\Mozilla\Firefox\
Edit the file "profiles.ini" in that folder.
It should look like :

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=1
Path=Profiles/d9jf63k8.default
Default=1

 Change the line "Path=Profiles/d9jf63k8.default" to "Path=Profiles/z8h0c3kh.default"
In the above example, replace the cryptic looking name I have here with the one on your folder from earlier.

Now if you load Firefox everything should be there. Your bookmarks AND extensions, plugins, themes.

It will be as if Firefox was never un-installed, all the while enjoying your CLEAN install of Windows 10!