Fennec remote-tab browser now has buttons to sort by date, name, or source client. This mostly fixes bug 481326, but I need to add more metadata to tab records before I can make sort-by-date work.

services/sync/services-sync.js

@@ -36,3 +36,5 @@ pref("extensions.weave.log.logger.engine.tabs", "Debug");
 pref("extensions.weave.log.logger.engine.clients", "Debug");
 
 pref("extensions.weave.network.numRetries", 2);
+
+pref("extensions.weave.tabs.sortMode", "recency");