Greasemonkey

A Firefox extension that allows you to customize the way webpages look and function.

Browser extensionfreeglobal

A Firefox extension that lets users change how webpages look and behave by installing or writing user scripts. It includes a built‑in script editor, supports Firefox on Android, and is aimed at Firefox users, script authors and tinkerers; source and release notes are maintained on GitHub and the extension is available from addons.mozilla.org and offered for free.

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