CRX id
eoaifcdijjicofbnifcmcmdjicbmofmp
eoaifcdijjicofbnifcmcmdjicbmofmp
Description from extension meta
Reorder your Yahoo Mailboxes and choose to always sort your mail by unread.
Image from store
Description from store
Reorder Yahoo Mailboxes is in BETA and is still being worked on.
Open source: https://github.com/charleskimbac/reorder-yahoo-mailboxes