Getting help and contacting playdoh devs
We hang out on
irc.mozilla.org. That's a synchronous chat, so if someone doesn't answer your questions, then it's possible no one is around or the people who are around don't know the answer.
All security notices and playdoh project updates are sent to the dev-webdev mailing list.
If you use playdoh, it behooves you greatly to join this list. At the time of this writing, the list is pretty low traffic.
Writing up issues:
If you find yourself stuck, write up an issue in github.