25% CPU load when Ghostery detects blocking items in Firefox

After today's update 25% CPU load for FF when a web-site-tab is foreground and Ghostery dedects blocking items. The popup (= list of blocked items top right) does not disappear. When switching to a tab where Ghostery does not dedect any blocking items CPU-load for FF is 0%.
Win XP 32 Pro, Firefox 12
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