Plugin store
Users can add plugins to their session using the in-app plugin store. The plugin will be added to your "session" which can be shared with the share button (or if you are an admin running the admin-server, then it will be added to the config file).
This can add extra functions, tracks, or many other interesting features. For example, if you add the CIVIC plugin, it will automatically add a track that contains the CIVIC cancer gene annotations to hg19.
Note
Not all plugins are directly useful from being added, and require hand-editing of the configuration file to be useful. If you would like to use such a plugin and do not have access to the configuration file, contact your administrator.