As others have said, it should work until plugins are dropped after ESR 52, but 
Microsoft actually stopped supporting Silverlight on Firefox on December 2016.  
See the “System Requirements” tab on this page:

Jason Jackson
Computer Systems Technician
North Vancouver School District

From: Enterprise [] On Behalf Of Eddy 
Sent: February 9, 2018 8:00 AM
Subject: [Mozilla Enterprise] Silverlight in firefox ESR

Hi everyone.

Does anyone know until when mozilla firefox ESR will support the plugin for 

I have seen that it is during the first semester of this year, is it correct?
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