Bug 1167552 - Enable network.dns.get-ttl r=mcmanus

modules/libpref/init/all.js

@@ -1603,7 +1603,7 @@ pref("network.dnsCacheEntries", 400);
 pref("network.dnsCacheExpiration", 60);
 
 // Get TTL; not supported on all platforms; nop on the unsupported ones.
-pref("network.dns.get-ttl", false);
+pref("network.dns.get-ttl", true);
 
 // The grace period allows the DNS cache to use expired entries, while kicking off
 // a revalidation in the background.