The LightBlock for Special:Chat gives the user the ability to prevent all messages by a certain user or set of users from appearing.
This extension affects Chat on a personal level only. It does not interfere with messages as seen by other users.
To block or allow messages from a user, click on their name in the user list to bring down the user's drop down menu. The option is below the "Private Message" button.
To block, enter
To unblock, enter
To list blocks, enter