It would be nice to be able to query phabricator via browser extensions. This allows us to write extensions that use the privileges of the currently user: for example, mousing over a task (in some other UI) can do an XHR to Phabricator to ask for task status, task title, etc. Right now, I can create an API app but it won't get the auth powers of the user currently on the browser and logged in to phabricator.
(sorry if this already exists; my Google skills didn't show much)