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MailHops
MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.
ThunderSec Requires Restart
ThunderSec is a security extension that provides several pieces of additional security functionality, including DNS-based Blackhole List (DNSBL), Realtime Blackhole Lists (RBL), DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF).
To create your own collections, you must have a Mozilla Add-ons account.