Bug 1162570 - Enable context in conversations for Loop. r=mikedeboer

browser/app/profile/firefox.js

@@ -1719,7 +1719,7 @@ pref("loop.support_url", "https://support.mozilla.org/kb/group-conversations-fir
 pref("loop.contacts.gravatars.show", false);
 pref("loop.contacts.gravatars.promo", true);
 pref("loop.browserSharing.showInfoBar", true);
-pref("loop.contextInConversations.enabled", false);
+pref("loop.contextInConversations.enabled", true);
 
 pref("social.sidebar.unload_timeout_ms", 10000);