Hacker Tagger is a lightweight extension for the Chrome browser that allows you to tag users on Hacker News. With this extension, you can assign tags to specific users, which will then appear next to their username in comments and posts on the Hacker News website.

One of the key features of Hacker Tagger is the ability to store additional data about users within the tag JSON structure. This allows you to add personalized information or notes about a user directly within their tag. Whether you want to remember someone's expertise, their previous interactions, or any other relevant details, Hacker Tagger provides a convenient way to keep track of this information.