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GNU LibreJS aims to address the JavaScript problem described in Richard Stallman's article The JavaScript Trap. LibreJS is a free add-on for GNU IceCat and other Mozilla-based browsers. It blocks nonfree nontrivial JavaScript while allowing JavaScript that is free and/or trivial.

Downloading LibreJS

While using GNU IceCat or any Mozilla browser, you may also install LibreJS directly by clicking on this link and following the subsequent instructions: Install in Mozilla browser.

LibreJS current source can be found via HTTP: librejs-6.0.1.tar.gz. LibreJS is also on the main GNU ftp server here:

You can also take a look at the Bazaar repository branch here:

Releasing Your JavaScript as Free Software

If you are a webmaster, please read instructions on how to set your JavaScript free so that it respects your users' freedom.


Documentation for LibreJS is available online, as is documentation for most GNU software.

Mailing lists

LibreJS has the following mailing lists:

Announcements about LibreJS and most other GNU software are made on info-gnu (archive).

Security reports that should not be made immediately public can be sent directly to the maintainer. If there is no response to an urgent issue, you can escalate to the general security mailing list for advice.

Getting involved

Development of LibreJS, and GNU in general, is a volunteer effort, and you can contribute. For information, please read How to help GNU. If you'd like to get involved, it's a good idea to join the discussion mailing list (see above).

LibreJS is currently being maintained by Nik Nyby. Please use the mailing lists for contact.


LibreJS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.


Special thanks go to GNU Chief Webmaster Jason Self for his feedback, testing, and support.

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