Greetings; after completely removing Firefox 1.0.6 and my profiles from two different machines, I installed Firefox 1.5 and created a new profile on both machines. After installing Adblock Plus and all my other favorite extensions, I found that one of the machines did not have the statusbar icon/text visible despite any changes to the preferences.
The recent upgrades did not resolve the problem, so I did some digging in the forums and found no solutions that were useful. However, I did stumble across a clue that helped solve the problem. On the machine that was displaying the statusbar icon, I dragged the icon to the left of the statusbar and then back to the right.