Awesome
Unity3D-PrefabEditor
Plugin unity3D to edit prefabs on separate scene.
Inspired by forestrf/prefab-editor
Usage
To open prefab editor, double click on a prefab file in project panel. Current scene is save and a new empty scene with only prefab instance is create. Editor lighting is disable and prefab instance is focus. To apply modifications juste save this tmp scene (with Ctrl-S).