Greasemonkey

Greasemonkey

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Greasemonkey promo image
What is Greasemonkey?

Greasemonkey is an advanced Firefox add-on that provides users the opportunity to personalize how a webpage displays or functions. Through scripting small JavaScript snippets, users can modify internet pages, create personalized site scripts, or use existing ones. It also provides a platform for troubleshooting and script hosting.

Merlin
Stats
Rating: 4.17 (1,229)
Version: 4.12.0 (Last updated: 2023-12-18)
Creation date: 2005-05-20
Weekly download count: 3,351
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
Permissions:
  • <all_urls>
  • clipboardWrite
  • cookies
  • downloads
  • notifications
  • storage
  • tabs
  • unlimitedStorage
  • webNavigation
  • webRequest
  • See more
Size: 630.29K
URLs: Website
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
Want to check extension ranking and stats more quickly for other Firefox add-ons? Install Chrome-Stats extension to view Chrome-Stats data as you browse the Firefox Browser Add-ons.
Chrome-Stats extension
Merlin
Summary

Allows you to customize the way a web page displays or behaves, by using small bits of JavaScript.

You can write your own scripts, too. Check out http://wiki.greasespot.net/ to get started. Many scripts already exist, probably ones to enhance your favorite sites. Find them at http://wiki.greasespot.net/User_Script_Hosting .

Having trouble? Please don't post comments here, nobody will see them. If you need help, please read: http://wiki.greasespot.net/Greasemonkey_Manual:Getting_Help

User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • 非常实用 (Very practical/useful)
Cons
  • Lack of updates for 3 years
  • Incompatibility with current versions of Firefox
  • Broken UI in Firefox 119.0 (64-bit)
  • Scripts not working properly when compared to other similar extensions
Most mentioned
  • Outdated/no recent updates
  • Incompatibility issues with new Firefox versions
  • Comparison with Tampermonkey and Violentmonkey
View all user reviews
Safety
Risk impact

Greasemonkey is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Greasemonkey if you trust the publisher.

Risk likelihood

Greasemonkey is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Upgrade to see risk analysis details
Screenshots