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Microsummaries are removed as of Firefox 6.0: https://bugzilla.mozilla.org/show_bug.cgi?id=524091
Can't imagine building microsummaries without this. I concur on the compatibility with FF4, but no such luck with FF5. Four stars for incredible usefulness, minus one for lack of maintenance.
Compatible with Firefox 4.0
In fact.. I'm using it right now with nightlies :D