The Online Safety Act - I'm under 18 is a Chrome add-on designed to help parents protect their children from inappropriate online content without sacrificing privacy. This tool allows parents to inform websites that their child is under 18 by adding an 'x-osa-under18' header to every request made through the browser. It provides a simple and effective means of communication with websites, enabling them to tailor content visibility based on age without requiring any personal data or third-party involvement.

This plugin is a functional solution for concerned parents, emphasizing the importance of protecting children's online experiences while minimizing data sharing. However, it is important to note that this tool should be part of a broader strategy for online safety, as it does not prevent children from bypassing restrictions if they are determined to access inappropriate content. Overall, it complements existing parental controls found in most operating systems.