How to verify download of LibreWolf web browser?

Hi.

I downloaded LibreWolf-84.0.2-2.x86_64.AppImage and LibreWolf-84.0.2-2.x86_64.AppImage.sig. I can't see a way to verify it.

I tried this so far:

Code:gpg --verify LibreWolf-84.0.2-2.x86_64.AppImage.sig LibreWolf-84.0.2-2.x86_64.AppImageOutput:
Code:gpg: Signature made Wed 20 Jan 2021 23:19:46 GMT
gpg: using EDDSA key A98C3D1364D8C16408143C2E2954CC8585E27A3F
gpg: Can't check signature: No public keyI take it that these are key? [pun intended]
https://librewolf-community.gitlab.io/keys/

Is this method correct?

Input:

Code:gpg --recv-keys A98C3D1364D8C16408143C2E2954CC8585E27A3FOutput:

Code:gpg: keyserver receive failed: No nameI'm stumped. I don't see why the verification process is not more obvious.

Anyone know what to do next?

Thanks.