Greasemonkey

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

Fix compatibility with Firefox 54. (#2480)

Privacy Policy

This Privacy Policy governs the manner in which Greasemonkey collects, uses,
maintains and discloses information collected from users (each, a
"User") of the Greasemonkey Application. This privacy policy applies to
the Application and all products and services offered by Greasemonkey.

Personal identification information

We do not collect personal identification information from Users.

Non-personal identification information

We may collect non-personal identification information about Users
whenever they interact with our Application. Non-personal identification
information may include the list and/or number of installed scripts,
the source they were obtained from, metrics describing usage of the
Application and User behavior and Telemetry, and other similar
information.

How we use collected information

Greasemonkey may collect and use Users personal information for the following purposes:

To improve our ApplicationWe may use feedback you provide to improve our products and services.
UpdatesWe may use stored information in order to check for and/or install updates.
SynchronizationWe may share collected information for the purpose of synchronization across devices, via the standard Firefox Sync feature.

How we protect your information

We adopt appropriate data collection, storage and processing practices and
security measures to protect against unauthorized access, alteration,
disclosure or destruction of your personal information and data stored
on our Site.

Sensitive and private data exchange between the Application and its Site happens
over a SSL secured communication channel and is encrypted and protected
with digital signatures.

Sharing your personal information

We do not sell, trade, or rent Users personal information to others. We
may share generic aggregated demographic information not linked to any
personal information regarding visitors and users with our business
partners, trusted affiliates and advertisers for the purposes outlined
above. We may publish aggregated statistics based on this information
online.

Changes to this privacy policy

Greasemonkey has the discretion to update this privacy policy at any time. When we
do, we will post a notification on the main page of our Site, and revise
the updated date at the bottom of this page. We encourage Users to
frequently check this page for any changes to stay informed about how we
are helping to protect the personal information we collect. You
acknowledge and agree that it is your responsibility to review this
privacy policy periodically and become aware of modifications.

Your acceptance of these terms

By using this Application, you signify your acceptance of this policy. If
you do not agree to this policy, please do not use our Application. Your
continued use of the Application following the posting of changes to
this policy will be deemed your acceptance of those changes.

Contacting us

If you have any questions about this Privacy Policy, the practices of this
site, or your dealings with this site, please contact us at:

Greasemonkey
http://www.greasespot.net/

This document was last updated on November 7, 2012.

Some add-ons ask for permission to perform certain functions. Since you’re in control of your Firefox, the choice to grant or deny these requests is yours.

Please note this add-on uses legacy technology, which gives it access to all browser functions and data without requesting your permission.

Add-ons

Welcome to Firefox Add-ons.

On the go?

Greasemonkey 3.10 Requires Restart

by Anthony Lieuallen, Aaron Boodman, Johan Sundström

About this Add-on

Version Information

Version 3.10 Released February 22, 2017 325.5 KiB Works with Firefox 38.0 and later

Development Channel