Bug 1457651 - Re-enable tab warming on Tier3 platforms. r=mconley

MozReview-Commit-ID: 3TCUbX4Wx8q

--HG--
extra : rebase_source : 9886b6f520a8ab6440ecf9dfae1a4963b41792b4

browser/app/profile/firefox.js

@@ -1535,9 +1535,7 @@ pref("browser.tabs.remote.desktopbehavior", true);
 // This feature is enabled on macOS only on the Nightly channel
 // until bug 1453080 is fixed.
 //
-#if defined(XP_LINUX) || defined(XP_WIN)
-pref("browser.tabs.remote.warmup.enabled", true);
-#elif defined(NIGHTLY_BUILD) && defined(XP_MACOSX)
+#if !defined(XP_MACOSX) || defined(NIGHTLY_BUILD)
 pref("browser.tabs.remote.warmup.enabled", true);
 #else
 pref("browser.tabs.remote.warmup.enabled", false);