Now it's time for them to move to Node. They currently use the JS engine from Firefox 45 (over 2 years old) and are looking to move to 52 (almost 15 months old). Let's not forget that the update before that was from FF25 which was from 2013. It's past time to port your stuff to N-API and actually allow devs to have access to standard dev tools using standard dev practices. It would be a great change for Gnome devs to…
That is quite misleading. They are using the extended support releases: https://www.mozilla.org/en-US/firefox/organizations/
So "almost 15 months old" should be the "most recent one up until the start of this month".