From the description on the website: DiamondX is a simple NPAPI plugin built to run on Unix platforms and exercise the XEmbed (http://www.mozilla.org/projects/plugins/xembed-plugin-extension.html) browser extension. If your browser can run the DiamondX browser plugin then it ought to be able to run the upgraded, XEmbed-supporting future version of Adobe Flash Player for Unix (on particular platforms and CPU architectures). ..and from flash blog: For future releases of the Adobe Flash Player for Unix platforms, we would like to use a better method of integrating with the encapsulating web browser. This method is known as XEmbed. It is supported by some Unix web browsers but not all. Naturally, the best reason for a browser to support this interface would be if the Flash Player supported it. ... That's why I threw together such a test plugin. Further, my corporate masters have authorized me to release it as open source! I call the plugin DiamondX Reproducible: Always Steps to Reproduce: 1. Always 2. 3.
It's in the tree. The sample index.htm and the accompanying a.diamondx are installed in the documentation directory for the package under examples/.
Er, that's net-www/diamondx for you. :)