Over the next few months, this mozilla.dev.tech.js-engine mailing list (and its sibling mozilla.dev.tech.js-engine.internals) are being phased out. We still want to hear your questions and the development team has agreed to migrate to the Mozilla Discourse instance instead.
https://discourse.mozilla.org/c/spidermonkey
Discourse is a web-based forum that can still be accessed directly by email if that is your preference. Please continue to ask your questions there. I expect this should bring in more people from the current team to help with answers and advice as well.
I will also take this opportunity to point out that the project now maintains a website at
https://spidermonkey.dev/ with the goal of keeping links to relevant and current information there.
The development team has a public Matrix chat channel for real-time chat for those who prefer it.
https://chat.mozilla.org/#/room/#spidermonkey:mozilla.org
This current mailing list is actually a Usenet/NNTP group fused to email via GNU Mailman and also to Google Groups. The setup is quickly showing its age and due in for a modernization.
SpiderMonkey will turn 25 this year and the team is excited for what is in store, so come join us on Discourse or Matrix!