Bug 1569996 - Enable setting the default referrer policy for third-party tracking resources to strict-origin-when-cross-origin when Enhanced Tracking Protection is turned on; r=baku

Differential Revision: https://phabricator.services.mozilla.com/D39885

--HG--
extra : moz-landing-system : lando

modules/libpref/init/all.js

@@ -1490,12 +1490,8 @@ pref("network.http.referer.defaultPolicy", 3);
 // default cookie policy is set to reject third-party trackers;
 // to be used unless overriden by the site;
 // values are identical to defaultPolicy above
-#ifdef NIGHTLY_BUILD
-// On Nightly, trim referrers from trackers to origins.
+// Trim referrers from trackers to origins by default.
 pref("network.http.referer.defaultPolicy.trackers", 2);
-#else
-pref("network.http.referer.defaultPolicy.trackers", 3);
-#endif
 // Set the Private Browsing Default Referrer Policy;
 // to be used unless overriden by the site;
 // values are identical to defaultPolicy above
@@ -1505,8 +1501,8 @@ pref("network.http.referer.defaultPolicy.pbmode", 2);
 // trackers;
 // to be used unless overriden by the site;
 // values are identical to defaultPolicy above
-// No need to change this pref for Nightly only since in private windows we
-// already trim all referrers to origin only.
+// No need to change this pref for trimming referrers from trackers since in
+// private windows we already trim all referrers to origin only.
 pref("network.http.referer.defaultPolicy.trackers.pbmode", 2);
 // false=real referer, true=spoof referer (use target URI as referer)
 pref("network.http.referer.spoofSource", false);