Beginning in Firefox version 52 released March 7, 2017, installed NPAPI plugins are no longer supported in Firefox, except for Adobe Flash. Some of the plugins

Beginning in Firefox version 52 released March 7, 2017, installed NPAPI plugins are no longer supported in Firefox, except for Adobe Flash. Some of the plugins that no longer load in Firefox, even though they may be installed on your computer, include Java, Microsoft Silverlight and Adobe Acrobat. See this compatibility document for details. https://support.mozilla.org/en-US/kb/npapi-plugins?as=u&utm_source=inproduct https://support.mozilla.org/en-US/kb/npapi-plugins?as=u&utm_...