Log in
Preview of Greasemonkey

Greasemonkey by Anthony Lieuallen

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

4.2 (1,271 reviews)
167,570 Users
You'll need Firefox to use this extension
Download Firefox
Download file
Screenshots
Installing a new user script.Greasemonkey's main menu.
About this extension
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
Rated 4.2 by 1,271 reviewers

Star rating saved

5
877
4
124
3
64
2
34
1
172
Permissions and dataLearn more

Required permissions:

  • Input data to the clipboard
  • Download files and read and modify the browser’s download history
  • Display notifications to you
  • Access browser tabs
  • Access browser activity during navigation
  • Access your data for all web sites
More information
Version
4.13
Size
615.72 kB
Last updated
a year ago (5 Aug 2024)
Related Categories
Version History
Add to collection
Report this add-on
Release notes for 4.13
New features:
  • GM.openInTab() now works in Firefox for Android. (#3189)
<p>Fixed bugs:</p>
  • Importing a backup could fail when "overwrite already installed scripts" (enabled by default) was disabled. (#3195)
  • Previously unreliable automatic script updates should now work as intended. (#3190)<br />
More extensions by Anthony Lieuallen