OpenH264 add-in is not automatically installing and has a message of "will be installed shortly"
I am trying to install the OpenH264 Add-in from the Add-ins section on a Firefox 68.9.0-esr.1 version running Raspbian "Buster" which is up to date. Even though the Firefox is installed correctly and connected to the internet this add-in keeps displaying a warning or info sticker saying "OpenH264 Video CODEC is provided by Cisco Systems, Inc - Will be installed shortly.
I have waited hours for it to start to download, tried restarting Firefox, even rebooted the entire system will no success.
Even tried to download it manually from the OpenH264 site but could not find a .xpi or .jar file to plug in.
Can anyone help as to how I can make this Add-in download happen inside Firefox please?