For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Mozilla:Add-ons:Git/openSUSE_Tumbleweed/home:Ximi1970:Mozilla:Add-ons:Git.repo
zypper refresh
zypper install gnome-shell-extension-appindicator
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Mozilla:Add-ons:Git/15.6/home:Ximi1970:Mozilla:Add-ons:Git.repo
zypper refresh
zypper install gnome-shell-extension-appindicator
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Mozilla:Add-ons:Git/15.5/home:Ximi1970:Mozilla:Add-ons:Git.repo
zypper refresh
zypper install gnome-shell-extension-appindicator
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Ximi1970:Mozilla:Add-ons:Git/15.4/home:Ximi1970:Mozilla:Add-ons:Git.repo
zypper refresh
zypper install gnome-shell-extension-appindicator