[ Thanks to kiterunner for this link.
]
“KidZui turns Firefox into fun, kid-safe browser and
online playground for kids in the age group 3-12, with over a
million kids games, YouTube videos, and websites. Or in other
words, KidZui Firefox extension turns Firefox into a place where
your kids would love to be. With Internet becoming such a useful
tool for people of all ages, it is unfair to block Internet access
to your toddlers and KidZui is exactly what you want to ensure
safety of your kids from the hidden dangers of the Internet.“Quick Review of KidZui Internet For Kids Firefox Extension
* KidZui is a Firefox add-on that with one click turns Firefox
into a kid-safe environment with over a million kid-friendly
websites, games, pictures, and YouTube videos.”