RESOLVED WONTFIX 22912
Unity3d webplayer plugin no longer starts 
https://bugs.webkit.org/show_bug.cgi?id=22912
Summary Unity3d webplayer plugin no longer starts
M. Beaumel
Reported 2008-12-17 23:22:40 PST
On the linked site or other websites using the unity3d webplayer plugin (http://unity3d.com), the embedded application no longer starts: it seems the Flip4Mac plugin is being loaded instead. There is no such problem with the current version of Safari (3.2.1 (5525.27.1)), and I'm pretty confident this is a quite recent regression in Webkit. This behaviour is seen on Mac OS X 10.5.6 PPC.
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M. Beaumel
Comment 1 2008-12-17 23:29:44 PST
Additionally, removing the file Flip4Mac WMV Plugin.webplugin from the internet plugins folder fixes the problem.
Ahmad Saleem
Comment 2 2022-07-01 10:24:38 PDT
Unity3D plugin was based on NPAPI or Webkit Plugin and the support for both has been removed. Can this be marked as "RESOLVED WONTFIX". Thanks! Link - https://docs.unity3d.com/530/Documentation/Manual/TroubleShootingWebplayer.html (Excerpt below:) The webplayer is built from 3 components, the plugin, the player, and Mono. The Player is the Unity runtime that executes your game, and loads assets for you. It’s the same runtime (more or less) as the one that is created if you make a standalone. This runtime needs Mono to run correctly. (Since your game will use Javascript or C# scripts that depend on Mono.) Finally, the Plugin is the glue that connects the web browser to the runtime. The Plugin is either an ActiveX control (OCX) on Windows if you are using Internet Explorer, or a NPAPI-style DLL for other Windows browsers, or a .plugin on a Mac.
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