How do I enable WebGL in Safari 5.1?

>>... open the Develop menu in the menu bar and select Enable WebGL.

>> ...This seems to have been disabled in later versions of Safari...we are now at OSX 9, Safari 7

Safari 7 on 10.9 : What's been disabled ?

Interesting: the new Google Maps just told me that it was working in "Lite" mode because my system doesn't support WebGL. But I have Safari 6.0.5, and the Develop menu is enabled, and Enable WebGL is checked.

What am I doing wrong?

I guess it's possible my graphics hardware isn't supported: 2009 Mac mini with NVIDIA GeForce 9400 256MB.

This seems to have been disabled in later versions of Safari and is not offered currently on Apple site as extension either. Chrome works fine. Note date and sys version of original question. we are now at OSX 9, Safari 7

I did according to instructions and enabled WebGL on Safari, Chrome and Firefox but still all of them say WebGL is not supported. I updated all of them to the latest version as well.

I have Mac OS 10.6.8 on White 13" MacBook from 2007.

I even unchecked

Use hardware acceleration when available this in Chrome://settings but it didn't have any effect.

When I look at Chrome://gpu I see this:

WebGL: Unavailable. Hardware acceleration disabled.

I have made the same steps, but there is no option "Enable Web GL" in my Develop menu. I use Safari 5.1.7 under Windows 7.