Firefox Add-ons: Firefox 用の一般的なプラグインWhy do Java, Silverlight, Adobe Acrobat and other plugins no longer work? Since Firefox version 52 was released March 7, 2017, installed NPAPI plugins have not been supported in Firefox, except for Adobe Flash Player. 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. End of Flash support: L
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