Hi everybody. I need help with build configuration for webgl.

I installed nightly Firefox 3.7 and turn on webgl in about:config.
Wow! I can see 3d in browser, ex. http://www.peternitsch.net/demo/webgl/ccube.html
But some demos don't work:
http://www.peternitsch.net/demo/webgl/index.html (work only with software render)

P.S. I'm sorry i bad speak english i'm russian fool guy

With big thx, ur Aler Kucher