GNOME Shell integrationby Yuri Konotopov

== Changes ==
* Firefox: multiple fixes of GNOME Shell extensions synchronization.
* Firefox 56 is minimum supported version now. ESR users should use browser extension
version 10.0.1.

== Translations ==
* Croatian (gogo)
* Danish (Alan Mortensen, Ask Hjorth Larsen)
* Dutch (Nathan Follens)
* Estonian (Liivia Lilleväli, Mart Raudsepp)
* German (Mario Blättermann)
* Hungarian (Balázs Úr)
* Indonesian (Kukuh Syafaat)
* Serbian (Мирослав Николић)
* Spanish (Daniel Mustieles)
* Turkish (Emin Tufan Çetin)

== Known issues ==
* In Firefox with enabled synchronization of GNOME Shell extensions all Shell extensions may be
removed after screen got locked because of missed support of "locked" idle state
in WebExtensions API implementation
(https://developer.mozilla.org/ru/Add-ons/WebExtensions/API/idle/onStateChanged).
* Chrome extension may be auto uninstalled after upgrade to connector version 10.
It can be restored using inline installation link at https://extensions.gnome.org or using
Chrome Store (https://chrome.google.com/webstore/detail/gphhapmejobijbbhgpjhcjognlahblep).
* Firefox can consume a lot of CPU and sometime crash on quit because of Mozilla's bug 1349874
(https://bugzilla.mozilla.org/show_bug.cgi?id=1349874).