Copy your Firefox passwords to another Firefox on a different machine

Just in case you are in process of setting up a new machine and installing Firefox you might want to save a little bit of time.
There is a stackoverflow question concerning where Firefox saves its passwords. This information becomes very valuable in case you don't want to enter (and maybe can't remember) each and every password of websites which require authentification.
In my case it works copying the files:

• key3.db
• signons.sqlite

from a Firefox 13 installation under Windows XP to a new Firefox 14 installation under Windows 7 (64 Bit).
I don't say it will work always but this situation is working well.
The above mentioned files are located in your Firefox profile folder.