Greasemonkey is Open Source, released under the terms of the MIT license; see the LICENSE.mit file. Greasemonkey contains code derived from AdBlock ( http://adblock.mozdev.org/ ), reused under the terms of the MPL license; see LICENSE.mpl. Greasemonkey contains code derived from FireBug ( http://getfirebug.com/ ), reused under the terms of the BSD license; see LICENSE.bsd. Greasemonkey contains code derived from SlipperyMonkey, originally by Dave Townsend, reused under the terms of the MIT license. ( http://www.oxymoronical.com/blog/2010/07/How-to-extend-the-new-Add-ons-Manager ) Greasemonkey contains code derived from Scriptish ( https://github.com/scriptish/scriptish ), reused under the terms of the MIT license. Greasemonkey also contains code derived from Mozilla projects, including Firefox ( http://mozilla.org/ ), reused under the MPL license; see the LICENSE.mpl file. All MPL code is located in the content/third-party/ and modules/third-party/ and skin/third-party/ directories, and all such files contain the appropriate licensing disclaimers and notifications.