First, do you have JavaScript enabled? If you type "about:config" in the location bar, and you search for a key called "webgl.disabled", is that true? You may

First, do you have JavaScript enabled? If you type "about:config" in the location bar, and you search for a key called "webgl.disabled", is that true? You may also have old drivers for your video card - though pretty much all the drivers in the past few years have OpenGL.