Non-Free Javascript on a gnu.org page

[Msavoritias]

   I am using the GNU Librejs addon and I found an issue in the free your
   javascipt page.
   [1]https://www.gnu.org/software/librejs/free-your-javascript.html
   It seems
   that [2]https://www.gnu.org/software/librejs/js/prettify/prettify.js
   this file is not free according to the addon.
   Where should I report this bug?
   MSavoritias

References

   1. https://www.gnu.org/software/librejs/free-your-javascript.html
   2. https://www.gnu.org/software/librejs/js/prettify/prettify.js