It’s right there under New. I’m not sure how long it has been there!
Unfortunately it doesn’t appear to let you change any parameters, so you’re “stuck” with ed25519.
You also can’t paste in an existing key, which is what I was expecting to be able to do.
What version are you on? I’m on 2024.12.4 and don’t have it.
2025.2.0
It’s the Edge extension (if that makes a difference - it might)
This does appear to matter. On Firefox latest version seems to still be 2024.12.4
I’ve noticed previously the Firefox extension tends to lag behind a bit with updates (I normally use Firefox but was at work).