FOKBlocker is a free and open source Chrome browser extension for FOK, a popular social forum where people can talk about any topic, upload or download anything (images, audio, video), write messages, send files and much more. This free, easy-to-use plugin will block users from posting on your forum and it works just like a normal plugin.

With this extension you can hide certain users from being visible on the forum. You just have to list those users using the following format:

user1,user2,user3 (comma-separated and without spaces)

Make sure to refresh the page to see the changes.