The Gmail Add-ons are executed by Gmail and are within Gmail-controlled webpages. Nothing in the add-on is private from Gmail/Google. If you want end-to-end GPG

The Gmail Add-ons are executed by Gmail and are within Gmail-controlled webpages. Nothing in the add-on is private from Gmail/Google. If you want end-to-end GPG-encryption where the plaintext and keys aren't accessible to Google, then you want to use a browser extension (such as Google's End-to-End extension or ones built off of it: https://github.com/google/end-to-end https://github.com/google/end-to-end).