Dialog to allow user to log in to third parties

Creates the ability to have a dialog pop up when a user wants to log in to a third party to interact: e.g. disqus, youtube, instapaper, etc.
Do you plan to eventually have this as an EFF-hosted list (similar to cookieblocklist.txt) so that this can be updated without an extension release?

It would be nice to modify the syntax of cookieblocklist.txt so this list could be incorporated into it.