--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1257,17 +1257,21 @@ pref("privacy.permissionPrompts.showClos
 // Enforce tracking protection in all modes
 pref("privacy.trackingprotection.enabled",  false);
 // Enforce tracking protection in Private Browsing mode
 pref("privacy.trackingprotection.pbmode.enabled",  true);
 // Annotate channels based on the tracking protection list in all modes
 pref("privacy.trackingprotection.annotate_channels",  true);
 // Lower the priority of network loads for resources on the tracking protection list.
 // Note that this requires the privacy.trackingprotection.annotate_channels pref to be on in order to have any effect.
-pref("privacy.trackingprotection.lower_network_priority",  false);
+#ifdef NIGHTLY_BUILD
+pref("privacy.trackingprotection.lower_network_priority", true);
+#else
+pref("privacy.trackingprotection.lower_network_priority", false);
+#endif
 
 pref("dom.event.contextmenu.enabled",       true);
 pref("dom.event.clipboardevents.enabled",   true);
 pref("dom.event.highrestimestamp.enabled",  true);
 
 pref("dom.webcomponents.enabled",           false);
 pref("dom.webcomponents.customelements.enabled", false);