Two handy scripts: a multifunctional chat filter and an instant statistics panel.
Entirely open source:
Please go to https://github.com/jcao219/tpp-browser-extensions.
This extension comes with two handy scripts that activate when watching the TwitchPlaysPokemon stream. One is the twitch-chat-filter, from https://github.com/jpgohlke/twitch-chat-filter/, a powerful and intelligent chat filter that won't slow your browser down.
It also comes with an instant statistics display script. **Look at the screenshots for a better idea of what this is.**
Or look at this gfycat: http://gfycat.com/AdvancedShockedChicken
Either or both of these two scripts can be disabled or enabled in the options page.