I am trying to help a senior friend move from Juno webmail to an email client and had the same question about how to extract the contacts from Juno webmail.
After reading these posts, I took another route. I created a temporary email in Juno and included all of the Juno contacts in the TO: field. I then selected and copied the entire TO: field and pasted the saved contacts into the TO: field in the email client (new message).
From that point, the email client allowed me to individually add the email addresses to the email client contact database.
Kind of a stupid "work around", but at least I was able to transfer all of the email addresses in the Juno Address Book to Outlook and a couple of other email clients I've come across.
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