You are using a browser that currently does not support WebGL. WebGL enables the 3D Model Viewer to reach full functional capabilities. If you wish to use the 3d Model Viewer and part configurator, please consider upgrading your browser or installing this add-on. This add-on may require a reboot.
If you run Windows 7 or 8 you should be fine since IE11 supports WebGL natively (with some restrictions). If you have an older Windows and IE version like 9 or 10, you have to install addon.
Starting with version 9.x of Google Chrome, WebGL is natively supported.
Firefox supports WebGL natively. Please always use the latest version of Firefox.
Mac only: Safari 5.1 and newer on OS X (10.6 and above) include support for WebGL (the Windows version does not). On older versions, you still have to enable it through the "Developer" menu. To activate the "Developer" menu go to Preferences->Advanced and check the "Show Developer menu in menu bar" button.