I just noticed these don't always line up to well with what the GC reason actually means, e.g. the reason for full store buffer is reported to the user as 'Nursery Objects Too Active'. http://searchfox.org/mozilla-central/source/devtools/client/locales/en-US/markers.properties#114 sfink or I could probably come up with some better descriptions. Filing this so I don't forget about it.
It was the best I could come up with that might make sense to a typical web dev. Conceptually the store buffer is full when there has been too much tenured -> nursery edge writes, or "activity". I agree it is a stretch :-P
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