Extensions: Extend extensions

[architechcro]

Hi,
I want to update firebase-email-send function
I've cloned the source of extension repository and try to update my extenstion with
firebase ext:update
but it always updates from original source - this repository.
I didn't find any details instructions on how to extend and update this extensions.
Hope you can help

[mbleigh]

Hi, developing / forking extensions is something we're experimenting with in a closed testing program. If you're interested in learning more, please sign up for the Firebase Alpha program.