Individual releases can be found here:

https://build.opensuse.org/project/show/home:Ximi1970:Mozilla:Add-ons:SysTray-X:0.9.9
https://build.opensuse.org/project/show/home:Ximi1970:Mozilla:Add-ons:SysTray-X:0.9.8
https://build.opensuse.org/project/show/home:Ximi1970:Mozilla:Add-ons:SysTray-X:0.9.7
https://build.opensuse.org/project/show/home:Ximi1970:Mozilla:Add-ons:SysTray-X:0.9.6
https://build.opensuse.org/project/show/home:Ximi1970:Mozilla:Add-ons:SysTray-X:0.9.5

To update the keys:

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