2 Ways to Remove Dock Icons in OS X Mountain Lion
- Click, drag away from the Dock by about 5cm, and hold for a second or two until the “poof” icon appears and then release.
- Drag and drop the Dock icon into the Trash
This may seem like an elementary tip to cover, but any time longstanding things change it can confuse even advanced Mac users.
This behavior will likely continue from OS X 10.8 onward. If you’re encountering any problems with this, try dragging the icon further away from the Dock and holding it a second longer.