Issue Installing "sconnect" Extension for Omani e-Services

Dear Firefox Support Team, I am writing to report a problem I'm facing while trying to install the "sconnect" extension on my Firefox browser. This extension is required for accessing national digital certification services in Oman. I am attempting to add the extension from the official portal: idp.pki.ita.gov.om. When I try to initiate the installation from this page, it fails to add to the browser. I have already ensured that my browser is up to date. This extension is essential for me to access important government and educational services, including those from the Ministry of Education (moe.gov.om). Could you please provide assistance or guide me on how to resolve this issue and successfully install the "sconnect" extension? Thank you for your time and support.