Bug 1519101 - Disable fingerprinting and cryptomining features by default, r=dimi

modules/libpref/init/StaticPrefList.h

@@ -1804,18 +1804,30 @@ VARCACHE_PREF(
 )
 
 // Block 3rd party fingerprinting resources.
+#ifdef NIGHTLY_BUILD
+# define PREF_VALUE true
+#else
+# define PREF_VALUE false
+#endif
 VARCACHE_PREF(
   "privacy.trackingprotection.fingerprinting.enabled",
    privacy_trackingprotection_fingerprinting_enabled,
-  bool, true
+  bool, PREF_VALUE
 )
+#undef PREF_VALUE
 
 // Block 3rd party cryptomining resources.
+#ifdef NIGHTLY_BUILD
+# define PREF_VALUE true
+#else
+# define PREF_VALUE false
+#endif
 VARCACHE_PREF(
   "privacy.trackingprotection.cryptomining.enabled",
    privacy_trackingprotection_cryptomining_enabled,
-  bool, true
+  bool, PREF_VALUE
 )
+#undef PREF_VALUE
 
 // Lower the priority of network loads for resources on the tracking protection
 // list.  Note that this requires the