Question 1

What is a userscript manager and why is it required to use Greasy Fork scripts?

Accepted Answer

A userscript manager (like Tampermonkey for Chrome/Edge/Safari or Violentmonkey for Firefox/Chrome) is a browser extension that provides the runtime environment for userscripts. Greasy Fork hosts the script code, but the manager is responsible for injecting and executing that code into web pages, handling updates, and managing script permissions. Without one, your browser cannot run userscripts.

Question 2

Are scripts on Greasy Fork vetted for security or malicious code?

Accepted Answer

Greasy Fork employs a community-driven moderation system and automated checks, but it does not guarantee that every script is free of malicious code. Users are strongly advised to review the script's source code, read comments, check its update history, and assess the author's reputation before installation. Exercise caution, as scripts run with significant browser privileges.

Question 3

How do I submit my own userscript to Greasy Fork, and what are the guidelines?

Accepted Answer

To submit a script, you'll need to create an account. Navigate to the 'Submit a script' page, paste your JavaScript code, and fill in metadata like name, description, and target domains. Scripts must adhere to Greasy Fork's rules, which include being open source, not containing malicious code, and having a clear purpose. Submissions undergo a review process by moderators.

Question 4

Can userscripts break website functionality or cause performance issues?

Accepted Answer

Yes, poorly written or conflicting userscripts can interfere with a website's native JavaScript, leading to broken functionality, UI glitches, or performance degradation. If you encounter issues, try disabling recently installed scripts one by one via your userscript manager to identify the culprit. It's good practice to test scripts on non-critical pages first.

Question 5

Does Greasy Fork host the script files directly, or does it link to external sources?

Accepted Answer

Greasy Fork hosts the script files directly on its servers. When you install a script, your userscript manager downloads the code from Greasy Fork. This ensures version control, update notifications, and a consistent source for the script, rather than relying on potentially unstable external links.

Greasy Fork Website Full Guide (2026)

Introduction

Key Features

Use Cases

Browser Environment Customization

How to Use Greasy Fork

Locate a Desired Script

Greasy Fork Alternatives

HotScripts

OpenUserJS

FreeFrontend (JS Snippets)

PowerShell Gallery

About Greasy Fork

Official Website

Video Mentions

Greasy Fork Status