Bug 1492563 - Enable blocking access to storage from tracking resources by default on all desktop platforms on Nightly r=baku

Differential Revision: https://phabricator.services.mozilla.com/D6349

browser/app/profile/firefox.js

@@ -1498,6 +1498,11 @@ pref("browser.ping-centre.production.endpoint", "https://tiles.services.mozilla.
 // Enable GMP support in the addon manager.
 pref("media.gmp-provider.enabled", true);
 
+// Enable blocking access to storage from tracking resources by default on Nightly
+#ifdef NIGHTLY_BUILD
+pref("network.cookie.cookieBehavior", 4 /* BEHAVIOR_REJECT_TRACKER */);
+#endif
+
 pref("browser.contentblocking.allowlist.storage.enabled", true);
 
 pref("browser.contentblocking.global-toggle.enabled", true);