Live Bookmarks can not be viewed as RSS feeds in the RSS Reader sidebar. and RSS Reader feeds can not be viewed as Live Bookmarks. They could and should be the exact same thing. Both are RSS, what is the difference?
What RSS sidebar are you talking about? The one that you installed as an extension? Because there isn't one by default in Firefox. Live Bookmarks are meant to be a simple solution, if you want something more advanced try Thunderbird's implementation.
sorry for bugspam, long-overdue mass reassign of ancient QA contact bugs, filter on "beltznerLovesGoats" to get rid of this mass change