PPAPI is Chromium-specific and unspecified. It is the result of Google going their own way with the creation of a new API after rejecting the proposals made by the other browser vendors on the plugin-futures mailing list [1].<p>[1]: <a href="https:&#x2F;&#x2F;mail.mozilla.org&#x2F;pipermail&#x2F;plugin-futures&#x2F;2010-April&#x2F;000088.html" rel="nofollow">https:&#x2F;&#x2F;mail.mozilla.org&#x2F;pipermail&#x2F;plugin-futures&#x2F;2010-April...</a>