Summary: Allow web authors to add integrity checks to sub-resources.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=992096

Spec: http://www.w3.org/TR/SRI/

Platforms: all

Estimated or target release: Q1 of 2015

Preference behind which this will be implemented:
security.subResourceIntegrity.enable

Background:

The best way to explain this is through an example. If you have the
following:

<script src="https://code.jquery.com/jquery-1.10.2.min.js";

integrity="ni:///sha-256;C6CB9UYIS9UJeqinPHWTHVqh_E1uhG5Twh-Y5qFQmYg?ct=application/javascript">

then the browser will refuse to execute the script if someone has gained
access to the jQuery servers and has replaced the script with a
malicious one (the hash won't match the expected one).

Our initial implementation will be limited to integrity checks for
script tags and stylesheets. While the spec is still evolving, we expect
to cover everything that ends up in level 1 of the spec.

Feel free to contact me if you have any questions.

Francois
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