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As soon as Aeon Big theme replaced my Sphere gnome in a update, without advance warning, my Toolbar Buttons does not have a button to add new toolbars. Also the small/big icon choice is missing. Why?

Это отзыв для предыдущей версии этого дополнения (0.5.0.3). 

Themes can hide parts of the Firefox UI and this one does it seams. I can't see why he would go hide all the controls in the customize toolbar window. There are two themes at http://accessfirefox.org/Firefox_Accessibility_Themes.php by the same author that look much the same, yet don't do so. You might want to try one of them.