Bug 1545593 - Enable tab unloading in low-memory scenarios unconditionally r=mconley

Differential Revision: https://phabricator.services.mozilla.com/D28146

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

browser/app/profile/firefox.js

@@ -496,12 +496,8 @@ pref("browser.tabs.remote.separatePrivilegedContentProcess", true);
 // Turn on HTTP response process selection.
 pref("browser.tabs.remote.useHTTPResponseProcessSelection", true);
 
-// Unload tabs on low-memory on nightly and beta.
-#ifdef EARLY_BETA_OR_EARLIER
+// Unload tabs when available memory is running low
 pref("browser.tabs.unloadOnLowMemory", true);
-#else
-pref("browser.tabs.unloadOnLowMemory", false);
-#endif
 
 pref("browser.ctrlTab.recentlyUsedOrder", true);