Comment 66 for bug 281348

"In Firefox 3.5.7 it works, attaching the screenshot after following steps in comment #19.
Once you close firefox and open it again it *does* have the button on the toolbar.
[Note: the icon does not appear when using the restart button and restarting while disabling/enabling the TMP addon. ]
Somehow restarting using the "restart" button causes some problem. [But, I usually never use the restart button ;) ]"

Even when I don't use the restart button in 3.5.7, my icons from tabmixplus and adblock still go away, while at the same time, the home icon reappears.