I have a customized toolbar with Toothless How to Train Your Dragon skin. After the address bar I have a TON of spaces, ok maybe not too many, but enough to keep the bar relatively small, but the Adblock Plus icon keeps reappearing to the far right side of all the "spaces" I have inserted. I keep customizing the toolbar and dragging it back to the left near the address bar and clicking the "done" button. Next time I reopen FF the icon is back on the right again, right on top of the graphic/skin.