Script Template Editor
With Script Template Editor you can easily create your own custom script templates, or make changes to the default templates Unity already uses when generating new files like C# and Shader scripts.
This extension is very useful for things like adding new default using statement, or for removing/replacing the default methods in your C# scripts.
Script Template Editor is always up-to-date. When Unity adds a new template type, it will automatically be found and added to the list of templates you can edit.
If you make a mistake or decide that you want the default templates back, you can always discard any changes you have made with the click of a single button.