Bug 1521961 - Pref Search in PBM OFF by default in 66 Release r=andreio

MozReview-Commit-ID: LT4kW4WON5y

Differential Revision: https://phabricator.services.mozilla.com/D17302

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

browser/app/profile/firefox.js

@@ -975,7 +975,11 @@ pref("security.certerrors.permanentOverride", true);
 pref("browser.privatebrowsing.autostart", false);
 
 // Whether to show the new private browsing UI with in-content search box.
+#ifdef EARLY_BETA_OR_EARLIER
 pref("browser.privatebrowsing.searchUI", true);
+#else
+pref("browser.privatebrowsing.searchUI", false);
+#endif
 
 // Whether the bookmark panel should be shown when bookmarking a page.
 pref("browser.bookmarks.editDialog.showForNewBookmarks", true);