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Firefox 84 will be the last version with NPAPI plugin support

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Moz/FF

Mozilla plans to remove support for so-called NPAPI plugins in Firefox 85 according to a post by Jim Mathies, Senior Engineering Manager, to the Mozilla Dev Platform group.

Mozilla dropped support for all NPAPI plugins except for Adobe Flash when it released Firefox 52 in March 2017. NPAPI allowed the browser to integrate plugins to add support for content such as Silverlight or Java to the Firefox web browser.

When Adobe announced that it would stop supporting Adobe Flash at the end of 2020, it was clear that Mozilla would not only disable support for Adobe Flash in Firefox but remove the entire NPAPI codebase from the browser.

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