Anu Twitch Chat Overlay od Pablo Bianciotto

*Now open source and looking for collaborators *

Show Twitch chat on top of the stream player (live and VODs). Read chat, send messages, automatically claim channel points, and more, without leaving fullscreen mode.
Customize position, font, background on a per stream basis and sync and store your preferences across your devices. Twitch dark and light themes supported by default.

Once installed, a Chat Overlay button will be added to the bottom right buttons panel of the Twitch video player which you can click to toggle the chat overlay on/off.
Choose the perfect position, font size, color and that's it!