 
Please enable hardware accelerated WebGL graphics in your browser!
Chrome
Enable hardware acceleration:
- Go to chrome://settings
- Click the Advanced ▼ button at the bottom of the page
- In the System section, ensure the Use hardware acceleration when available
checkbox is checked (you'll need to relaunch Chrome for any changes to take effect)
Then enable WebGL:
- Go to chrome://flags
- Ensure that Disable WebGL is not activated (you'll need to relaunch Chrome for any changes to take effect)
- In newer versions, this option of Disable WebGL will not be available, you will instead have to search for WebGL 2.0 
For more information, see:
Chrome Help: WebGL and 3D graphics.
 
Firefox
- Go to about:config
- Search for webgl.disabled
- Ensure that its value is false(any changes take effect immediately without relaunching Firefox)
 
Safari
- Go to Safari's Preferences
- Select the Advanced tab
- Ensure that the Show Develop menu in menu bar checkbox is checked
- In Safari's Develop menu, select Experimental Features sub-menu and ensure that WebGL 2.0 is checked