If you scroll to the bottom right corner of https://www.mozilla.org, you will see socials for Mozilla and Firefox with links to Bluesky, Instagram, Linkedin, Tiktok, Spotify, and YouTube.
But on some of the subdomains, the listing is obviously outdated.
https://blog.mozilla.org has Twitter, Instagram, and YouTube for Mozilla and Firefox:
https://connect.mozilla.org has Twitter, Instagram, and YouTube, but only for Mozilla:
Just for reference, MDN has its own socials listed at the bottom left of https://developer.mozilla.org:
