Are you a Twitch user and want to hide a message or a user from Twitch chat? This extension is your best choice. 

It’s a great browser add-on that hides all messages in the page from users you don't particularly like.

The extension is very simple and does not require a lot of time and effort to work, once you open it, you will see that it is very easy to use, just click the button that says "hide messages from usernames" and you will be able to enter the names of usernames that you want to hide. After entering the usernames you want to hide, click the button "apply changes" and you will see that all the usernames have been hidden. To make the changes you made take effect you have to refresh the page.