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replaced "limited" w/ "restricted" to tie-in example w/ diagram
Possibilities for Feed Plugins include:
* Plugins that execute code in a sandbox with a limited restricted codebase principal and mediate the exchange of data between it and the rest of Firefox to minimize the adverse effects of a malicious feed. See [http://www.toolness.com/wp/?p=356 A Security Model for Ubiquity] for more details.
* Plugins that unify Ubiquity's UI with other pre-existing forms of web extensibility, like Bookmarklets and Greasemonkey scripts.
* It should also be possible for one Feed Plugin to wrap another, creating possibilities for middleware. For instance, a social web-of-trust style model could be layered on top of an object capabilities model, thus providing multiple layers of protection for end-users.
