Once installed and activated by a parent, it locks the child (or anyone else for that matter) out of accessing non-Kidzui approved sites, or other areas of the computer, by taking up the entire screen. A password, which is chosen by the parent, is the only way to exit the KidZui browsing experience, essentially turning your computer into a kid-friendly Internet kiosk.
The browser extension has full support for the company's paid subscription service, which runs around $40 a year. Paying users get a few additional features like being able to white list certain sites, track children's browsing history on a per-session basis, along with a tool that will figure out what your kids are into based on that history.
What's really interesting here is this is one of the few times a standalone browser has been rolled up as an extension for another browser. Of the many variants which are built on top of mainstream browsers, there's the lingering question whether the same experience could simply be offered on top of someone else's product. With something like Flock or Maxthon, this would likely be underwhelming, however, in KidZui's execution it appears to be a smart play at getting more users onboard.