Almost all Firefox time is now showing up as "Unknown URL"

This only started happening a few days ago (possibly with the latest RescueTime update?), but almost all time spent in Firefox 3 beta 5 is being displayed as "Unknown URL". I've been using the Firefox 3 beta 5 for awhile, and this has only just started to happen. A few websites are showing up, but only a very small percentage. Thanks.
 
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