Ghostery disappears from the taskbar and can only be recovered by restarting Firefox 35.0.1

Although Ghostery's icon appears on the task bar when Firefox 35.0.1 starts up, it disappears during work sessions. The cookies that are detected still appear (briefly) in the lower right. As a result, it's impossible to block new intruders. The only way to get the icon back on the task bar is by restart Firefox 35.0.1. There doesn't appear to be anything on the settings menu for Ghostery that will solve this problem. No real help from Ghostery either. What to do?