Something we're going to need for both the enhanced blocklisting project and the self-help FHR project is an API for selectively cleaning up a user profile. To cite an example from FHR, if a problem can be traced to a problematic add-on, we'd want to be able to remove/disable the add-on, reset any prefs it would have overridden, and do any other form of cleanup we consider appropriate. Ideally this would take a JS object as an argument, in a format we can serve across both tools, allowing for a relatively simple usage pattern for service consumers. Something like |cleanup(fixupObj, promptUser)| would be correct in this model. A simple example could be something like this: { prefs: ["test.pref1","test.prefBranch2."], search: ["BadEngine1"], certs: ["EvilCA"], addons: ["evil@badpeople.com"] } Entries with a trailing period in prefs would reset an entire branch, otherwise reset the exact pref. Anything matching certs/addons/search would be removed.