Hey, great addon, there aren't many chat bubble-modifying addons available.
I use Prat, but will post here as the request is about this module.
Could you add an option to make the background of the bubbles transparent? ElvUI offers this, but I personally dislike ElvUI and using only their chat bubble module seems impossible. I think there are quite a few raiders out there that get spammed by interrupt messages from fellow raiders while they need to look at certain things, completely impairing their view.
If this is not possible, could you please tell me where the textures for the chat bubbles are stored? I will replace them manually for simple transparent rectangles then :D