I was just going through some ready solution to grab rss feeds from urls and came across "FeedTheFire".
But the Github link to it is giving me 404 error.
Is this service/project still alive or they moved it somewhere else or stopped development on this?
The Feed the Fire blog you linked is from the Legacy Firebase times (pre-Google). From there, it is included (as per Kato's comment):
UPDATE: Feed the Fire and Persona auth have been discontinued
I've done some quick searching and found this Feed the Fire on GitHub by Kato, where the last update was from May 2014 (AFAIK, still pre-Google times).