If you are like me and often use the “Save password” feature of Firefox because you can’t remember all the passwords you use for different web sites, and then suddenly have to setup a “fresh” Firefox on a new box, you need Password Exporter, an invaluable Firefox extension that plugs into the “Security” page of Firefox’ options dialog.
It allows you to export the saved passwords on one machine, then to re-import them on a target machine.
This unfortunately only worked in part for me. Login credentials that applied to the same server, but to different realms obviously failed to be imported. I don’t know exactly why this is, but it made the hole story pretty useless for me. I ended up copying
signons3.txt manually from the Windoze box to the Mac. 🙁