I deployed a new version (2.0.8) that should fix the transparency issue. Btw, it's easier for me to track issues when they are submitted here: https://github.com/akhanubis/twitch_chat_overlay_issues/issues
Well integrated, nice UI and good customization. Works flawlessly with BTTV and FrankerFaceZ. Dev also replied very fast to a bug report and fixed it within hours. Best option for Firefox right now.
