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Google did suddenly start supporting U2F in Firefox a few months ago!

Somehow doesn't work for me :-(

U2F is by default disabled in Firefox. You have to turn it on before using your Yubico (or other FIDO) key for a service being accessed though Firefox. It’s easy to enable. See https://www.trishtech.com/2018/07/enable-fido-u2f-security-k...

Did that some time ago already, doesn't work for me, I can't log in with my Yubikey, which at the same time works from Chrome.

Oh sorry it wasn't something simple. I just enabled it on my laptop yesterday and it worked (Firefox 62.0.2 running on MacOS 10.14).

At first I thought that I hadn't enabled right. After checking the setting again, I found the problem--I had plugged the Yubico Key in upside-down.