Strange that I have just had a play round with that Had to select the tabs on top first (don't like that option) and I moved three items, WOT, Closed tabs list and webrep, image (top). Restarted firefox and WOT was still there, Closed tabs list (greyed out), image (bottom) and webrep to the left of the address bar (not shown in image)
Edit: If I uncheck the tabs on top option the webrep icon appears back on the tab bar line Closed tabs list (greyed out), but that is because after restarting there were no closed tabs (working after closing a tab).