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User scripts are programs written in JavaScript to facilitate the editing of Wikipedia. User scripts enable user accounts to do things they otherwise couldn't. Many user scripts are available, ready for you to install. Also, you can write a new user script, either by modifying an existing script or by starting from scratch.
WikiProject JavaScript is a collaboration of editors to improve Wikipedia's JavaScript coverage, write user scripts, and maintain user script-related pages (like the one you are reading right now). If you would like to join, sign up here.