1. It is not plugin, but more similar to library or collections of them. Like jquery, forge.js and crypto
2. If you send email between scryptmail users, sender creating so called seed, that get scanned by everyone, but only intended recipient will be able to decrypt it, and download message, i.e more people using service and scanning seeds -harder to establish connection between sender and recipient.
2. If you send email between scryptmail users, sender creating so called seed, that get scanned by everyone, but only intended recipient will be able to decrypt it, and download message, i.e more people using service and scanning seeds -harder to establish connection between sender and recipient.
I hope it answers your question.