Comment 32 for bug 193141

i think this might be because the tag containers are a generic container object type, but have a result type of a folder:

http://mxr.mozilla.org/seamonkey/source/toolkit/components/places/src/nsNavHistory.cpp#4220

if i change the result type to RESULT_TYPE_HOST, for example, the assert goes away and the context menu is properly built.

i'd rather not add a new specialized result type for tag containers. instead we should add a generic container type, not specific to any particular content type.

(i'd like to move towards a more generic grouping and sorting strategy as well. but that's for another bug ;))