Erwin Coumans from Bulletphysics.org has published a Chrome extension that showcases real-time physics in the browser. The sample includes an embedded .blend file. You can also load your own .blend.
The Native Client module executed in this page runs a basic C++ Bullet Physics simulation.
Use the mouse wheel for camera zoom and left mouse button to pick and drag objects. The test embeds a Blender 3D .blend file and it can also load a local .blend file. This is an unmodified version of the Bullet C++ library using the premake build system. See the source code at http://github.com/erwincoumans/experiments.
Check in the Chrome "About Box" that you are using version 15 or later.