Second paragraph at that link:
K9 Web Protection is a free Internet filter and parental control software for your home Windows or Mac computer. K9 puts YOU in control of the Internet so you can protect your kids.
It does require you to get a license for each computer it is installed on:
Why we need your email address
We need your email address in order to send you your K9 license. You must have a valid email address because you won't be able to successfully install K9 without the K9 license number.
We also use your email to communicate with you regarding service issues and to send you a temporary password in case you forget yours. But we DON'T sell or share your email address with others and we don't spam you with excessive product promotional noise.
So please use a valid email address, and if you have anti-spam settings on your email account, please set it to receive emails from email@example.com, and/or check your "junk email" folder for a message from firstname.lastname@example.org. Do that right away so you can get your K9 Web Protection license on the very first try.
There is an add-on for Firefox for blocking specific websites in searches on Google and perhaps Bing. But there are other
Hide Unwanted Results of Google Search :: Add-ons for Firefox
Edited by buddy215, 01 May 2013 - 12:04 PM.
“Every atom in your body came from a star that exploded and the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics...you are all stardust.”― Lawrence M. Krauss
A 1792 U.S. penny, designed in part by Thomas Jefferson and George Washington, reads “Liberty Parent of Science & Industry.”