No, just cant import the keys. I tried for librewolf-bin and librewolf but it only says gpg: keyserver receive failed: DNS bla bla (I just typed it from my head but it was something like that). It gave DNS error but don't remember it. But I fixed it by using Discover app from KDE.
I wonder what Discover installed, probably a Flatpak. You should check just to know as there are pros and cons of using Flatpaks, AppImages, etc. over a system application.