I am trying to use the test_performance(callback) function within the sdk but unfortunately I am only getting a response in the chrome browser.

Later Internet explorer (webgl enabled) browsers, safari and firefox always return a value of 0

Chrome normally returns a value of 2 - 60 gb/s.

Is this functionality limited to specific browser / webkit types?

Are there any plans as of yet to include leap motion in your framework?
I noticed in the above post you stated.

"…it can bring interesting possibilities for Web apps so in future it will be supported"

Both myself and a few other developer friends would happily move from ThreeJS to B4W if this technology was available out of the box.

Thanks,

Chris