Rated 5 out of 5 stars

Please make an option to hide the icon from addon bar.

This review is for a previous version of the add-on (1.4.2.1-signed).  This user has other reviews of this add-on.

The addon bar is fully customizable in Fx4, so you can just right click on it and select "Customize...", then drag the icon out of the addon bar and that's it.