Interested in this as well. I don't see why it wouldn't work as described by the pro-aggregation side of the discussions.
My thoughts as a user first, dev way later:
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All links should be fully qualified by default. This way, sharing a post or community is straightforward.
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The default view of a community /c/foo should be the aggregation of all the posts of all the linked instances' /c/foo communities.
(If you only allow trusted linked instances, moderation should not be a big issue in the beginning. Because a rogue instance with potential spam wouldn't be linked, right?) -
The default view of your frontpage should probably also be All instead of Local. Because it's just less confusing for a new user. I suspect you first want to read and see what's going on - before you want to settle yourself in a community ...
What are your thoughts?
QA is probably just not testing on FF because of user share. And if it's not going through QA, you just don't support it as bog coorp...