I have a new Windows 10 computer running Firefox, and want to move my saved usernames and passwords from my old Widows Vista computer to my new computer. I have recovered my old files from iDrive to my new computer, but not sure which Mozilla file has the passwords and not sure how to move them into the Firefox program on my new computer.
Any help will be greatly appreciated.

Is the Vista machine still working?

This might be helpful.

https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data