2000050808 Select Search [in Sidebar] All Engines, if that isn't enough to fill the list then somehow make it fill [add tabs, shrink window, add engines], make sure that the list is not exactly a multiple of the item spacing. Result: The last visible item is drawn partially outside its container.
dupe, not your fault though because this dupe is impossible to find :-) *** This bug has been marked as a duplicate of 28244 ***
*** Bug 34186 has been marked as a duplicate of this bug. ***