It's completely useless. It just enables you to hide or show the side panel (which can be done with UI elements of the panel itself), hide or show the "Regenerate" button (which is useful), zoom in and out (which just duplicates Firefox controls). Its main purpose seems to be showing the donation button.

This plugin has proven itself with its speed, convenience, and simple functionality, which improves my chat work every day. Its seamless integration, enhanced performance, customization options, compatibility, and excellent support made it an invaluable asset.

I highly recommend it!