Description from extension meta
Shows Facebook email notifications completely in Gmail™.
Image from store
Description from store
When you enable notifications on Facebook, you have the ability to enable notifications by mail.
In the past, Facebook would add the complete description to those mails. However, since a few months they cut it off.
This extension brings it back, while having performance in mind and it doesn't collect any user data.
The Code is Open-Source on GitHub: https://github.com/kurtextrem/Gmail-FB-Expander