Retrieving passwords from old profile?

[99%]

I recently due to pc messup reinstalled (fresh) firefox
and saved my profiles folder.(i did not export my passwords...) However they dont register if i drag and drop the
signons.txt into the profiles folder since they seem to be profile specific.
Is there any way of retrieving them?
I desperatly need two of my lost passwords.
Thanks in advance

[99%]

Found the answer
simply switch
the old
signon.txt
key3.db
with the new and your back

ofcourse this sets some security issues

but im happy