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Does firefox support NPAPI plugin ?

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There is presently a working NPAPI plugin for our applications which works well in Chrome and we want to add it to firefow too. However, I heard that the firefox will no longer support NPAPI plugin for desktop systems ! Is that true?

There is presently a working NPAPI plugin for our applications which works well in Chrome and we want to add it to firefow too. However, I heard that the firefox will no longer support NPAPI plugin for desktop systems ! Is that true?

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Yes, Firefox supports NPAPI plugins.

https://developer.mozilla.org/en-US/Add-ons/Plugins

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I'm trying to install 'PortSIP VOIP SDK Plugin' on firefox, and it doesn't work ! I contacted the PortSIP support and they said that the firefox is no longer supporting NPAPI plugin !! :/