Many different things on Wikipedia can be simplified, automated, or customized with user scripts. For example, you can create scripts to automate different vandalism warnings, perform an AfD nomination, or display the current time in a place of your choosing.

Many scripts have been written by Wikipedians, and are ready for you to make use of. To enable these pre-made scripts, simply paste them into your common.js file (a user's common.js is loaded regardless of which skin they are using). You may have to purge the page before the script will load for the first time.