WebGL is the standard for displaying fancy graphics on the world wide web. Later versions of Mozilla Firefox support it if you are using MESA or proprietary ATI/Nvidia graphics. Most other browsers fail.
 Firefox HOWTO
You need 2.1 Mesa 7.10.3 or newer to get WebGL working with Firefox.
Firefox/Icecat versions 6 and 7 support WebGL and it should work unless you are upgrading. The trick that makes it work is to type about:config in the address bar. Search for webgl and reset everything to default.
If you are using version 6 then you will need to change webgl.force-enabled to true as this version fails to show even when OpenGL is supported without this setting.