Greasemonkey for Windows

Name: Greasemonkey
Rating: 3.3 (9 reviews)
Author: Mozilla

Used Greasemonkey for Windows?

The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.

Editors’ Review

Download.com staffFebruary 25, 2026

Greasemonkey is a Firefox extension empowering users to alter web page appearance and functionality with custom JavaScript snippets, offering deep control over web interactions.

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Trial version

Pros
- Customizes web page appearance and function.
- Uses DHTML user scripts for behavior changes.
- Enhances website usability.
- Enables selective use of content networks.
Cons
- Requires JavaScript knowledge for advanced customization.
- Limited to Firefox browser.

Greasemonkey for Windows

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Full Specifications

GENERAL

Release: October 12, 2020

Latest update: February 25, 2026

Version: 4.10

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 10
Windows 8
Windows Vista
Windows 7
Windows XP

Additional Requirements: Firefox 14.0 or later

POPULARITY

Total Downloads: 242,154

Downloads Last Week: 1

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Last Updated

User Reviews

3.3/5

9 User Votes

Trying to get this help for farmville
gailadkinsApril 30, 2011
Pros
Get the posts for farmville to inhance my game
Cons
Don't have to be here to receive gifts
Summary
I am hoping to receive gifts for my farm
It does what it promises!
barjesse37April 25, 2009
Pros
This add-on works well!
Cons
Not bad at all!
Summary
Not Compatible With Firefox 3.0.3 either
BBM2006November 11, 2008
Pros
Cons
Didnt let me install just said its incompatible
Summary
Not Compatible With Firefox 3.1
wrdavenportSeptember 4, 2008
Pros
Don't know, couldn't load it because it's not compatible
Cons
Not compatible with Firefox 3.1
Summary
iann13May 24, 2008
Pros
Cons
Summary
I had trouble getting the download to complete so I never used it,
americanflyer1September 13, 2007
Pros
Cons
I don't know if it was my PC not being able to download the Firefox Version of this add on or something else like my connection but the download would not complete and after I contacted my main IE7 I got that to open up so I just cleared a lot of things so my memory and amount of space on my Hard Drive I had to delete quite a few things.
Summary
Great
salvatore nizzolinoJune 18, 2007
Pros
Cons
Summary
really really take back the web
BeLeBoJune 3, 2005
Pros
(1) almost the power of proxomitron (2) geekier than thou users offer their resources for public consumption (3) WIDE base of support (4) it frightens ad serving companies (5) it makes viewing cnet less annoying (6) is an excellent compliment to AdBlock+ and Remove IT Permanently (7) lets me view content however I please (8) lets me view content however I please (9) lets me view content however I please (10) easily nukes hyper annoying dHtml floating ads
Cons
(1) cannot reorder scripts from the options pane (2) editing include and exlcude from the edit script option does not actually modify the script. Additionall these 'temporary' preferences cannot be exported (3) right click install script can sometimes explode the download manager to fullscreen and steal focus
Summary
The single best extension for Firefox
ForbiddenMay 28, 2005
Pros
This extension can do so many things. With this extension you install things called scripts, they allow Greasemonkey to overwrite website Java code. Basically this program can do things like Remove ads, auto login to websites, secure your internet privacy, and MUCH MUCH MORE.
Cons
Greasemonkey can't automatically check for user script updates...
Summary

Developer’s Description

By Mozilla

Customize the way Web pages look and function by using small bits of JavaScript.

Greasemonkey is a Firefox extension that lets you add bits of DHTML (user scripts) to any Web page to change its behavior. In much the same way that user CSS lets you take control of a Web page's style, user scripts let you easily control any aspect of a Web page's design or interaction. For example you could make sure all URLs displayed in the browser are clickable links, improve the usability of a site you frequent, route around common and annoying Web site bugs, or use the Coral content network selectively.

Greasemonkey for Windows

Editors’ Review

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Pros

Cons

Greasemonkey for Windows

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User Reviews

Trying to get this help for farmville

It does what it promises!

Not Compatible With Firefox 3.0.3 either

Not Compatible With Firefox 3.1

I had trouble getting the download to complete so I never used it,

Great

really really take back the web

The single best extension for Firefox

Developer’s Description