Twitch Chat User Highlight

Highlights messages by user, on username or @username click

So basically you can highlight all current and future messages by any given user by clicking on their username or on @theirusername on someone else's message.
To un-highlight, click their username again.

The main motivation for making this was all those times I see someone @user replying to someone and having to look around for the original person's message to know what they are talking about. This script makes that easy.

This does of course replace the default behaviour of clicking on users to open their user page, but you can still do that as normal with middle-mouse.

Compatible with BTTV & FFZ
Tested on latest versions of Chrome & Firefox