Greasemonkey is a Firefox add-on, which allows you to run JavaScript code on specific web pages, as defined in a User Script.

Greasemonkey is a User script manager for Firefox. User scripts are written in JavaScript, and run in every page as specified by the @include and @match rules.

Many User scripts are hosted on Userscripts.org.

User scripts are also available in other browsers: Have a look at the tag wiki of .

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