o update the keys (every year, before 1 March) for Arch:

osc signkey --extend home:Ximi1970
osc rebuild home:Ximi1970:Mozilla:Add-ons --all

Check key:

wget -q https://download.opensuse.org/repositories/home:/Ximi1970/xUbuntu_22.04/Release.key
gpg --show-keys Release.key