For your information, WebGL is a new web technology that brings hardware-accelerated 3D graphics to the browser without installing additional software. It is enabled by default in Firefox 4 and Google Chrome and is included in Safari and Opera.
How to disable WebGL in Firefox 4 and in Google Chrome?
For Firefox 4: Run Firefox and type about:config in the address bar and continue with warning dialog. Type Webgl in the Filter box and double click webgl.disabled to set its value to true.
For Google Chrome: Right click its icon on the desktop and select Properties. In the target field add -disable-webgl and save the settings. You can check its working by going to here. (via)
