Currently Firefox Screenshots deletes screenshots after 14 days or after selecting as favorite.
I don’t personally want to micromanage my screenshots but have benefited from a long-term retention in unexpected scenarios.
On the flip side, I understand Mozilla does not wish to manage that much user data.
To solve this, Mozilla should allow pushing screenshots via email, cloud storage providers (Google Drive, Dropbox, OneDrive, Box, etc), or personal storage providers (SFTP, or others?).
A plugin that auto-downloads could also serve a similar purpose.