IceCat 52.6.0 release

[Ruben Rodriguez]

GNUzilla is the GNU version of the Mozilla suite, and GNU IceCat is the
GNU version of the Firefox browser. Its main advantage is an ethical
one: it is entirely free software. While the Firefox source code from
the Mozilla project is free software, they distribute and recommend
non-free software as plug-ins and addons. Also their trademark license
restricts distribution in ways that hinder freedom 0.

GNU IceCat  has multiple practical advantages as well, such as better
privacy and security settings, extensive blocking of sites that may
track the user's browsing habits, or the inclusion of LibreJS and other
extensions that help browse without running non-free javascript.

https://www.gnu.org/software/gnuzilla/

The user manual pages are at http://libreplanet.org/wiki/Group:IceCat/
Please contribute by joining the wiki and editing the manuals.

Source tarballs, binaries for generic GNU/Linux systems and translations
are available at http://ftp.gnu.org/gnu/gnuzilla/

GPG key ID:D7E04784 GNU IceCat releases
Fingerprint: A573 69A8 BABC 2542 B5A0 368C 3C76 EED7 D7E0 4784
https://savannah.gnu.org/project/memberlist-gpgkeys.php?group=gnuzilla

== Changes since v52.3.0-ESR ==
 * Extensions:
   - HTTPS Everywhere updated to 2018.1.11
   - "goteo.org payments with free JS" updated to 1.1
   - "LibreJS compatible Pay.gov" updated to 1.3
   - "Reveal hidden HTML" updated to 1.6
   - Enabled WebRTC, but prevent leaking the LAN ip.