This would be a useful extension if it were well written. Unfortunately, it isn't. It's uses slow, annoying dialog windows that disappear when they lose focus. The options presented are not well thought out. Etc. Another problem is that the community is irresponsible about what they are reporting, so you can't rely on the ratings. A lot of web sites reported to be "unsafe" are actually perfectly safe sites expressing a legitimate political viewpoint the reviewer disagrees with. On the other hand, many sites that are truly problematic have high ratings because they entice users with something entertaining.