Move back the Firefox reload button to its proper place
Right-click the menu bar, select "Customize...", and then when the dialog comes up, you can drag and drop the existing reload button on the bar to go to the left of the url field.
That is, you are not limited to the selction of buttons shown in the dialog, you are free to move the already placed out buttons in the browser as well.
I moved mine .. I think it was right click on the navigation bar, click customize .. then drag and drop it where you want.
Read more: Firefox 7.0 question: how do I move reload button?