I think this has been around for sometime, but nevertheless I just found out the SafeSearch feature this morning.
The Lock SafeSearch will apply strict filtering to all searches from the computer using your default browser. Strict filtering filters both explicit text and explicit images from your search results. This will ease your life, especially when your family is using the same computer. The feature can be enabled from the Search Settings on the top-right corner. To indicate that SafeSearch is locked for this browser we've added colored balls to the top of all search pages. If the colored balls are not present, then SafeSearch is no longer locked.