in bug 410346, we found that navhistoryresults register themselves as bookmarks observers, but never remove themselves. that bug fixed the tagging service by working around the issue. we need to address the root cause.

is this still a problem marco?

hm, i'd say no, results stop observing either when the root node is closed, when cycle collected or when they are destroyed (actually being weak references they won't be called anymore once deleted). adding dependencies on the bugs that changed the behavior (hope to have found all of them)