--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -466,16 +466,21 @@ pref("browser.tabs.extraDragSpace", fals
 // true   return to the tab that opened this tab (its owner)
 // false  return to the adjacent tab (old default)
 pref("browser.tabs.selectOwnerOnClose", true);
 
 pref("browser.tabs.showAudioPlayingIcon", true);
 // This should match Chromium's audio indicator delay.
 pref("browser.tabs.delayHidingAudioPlayingIconMS", 3000);
 
+// Pref to control whether we use separate privileged content processes.
+#ifdef NIGHTLY_BUILD
+pref("browser.tabs.remote.separatePrivilegedContentProcess", true);
+#endif
+
 pref("browser.ctrlTab.recentlyUsedOrder", true);
 
 // By default, do not export HTML at shutdown.
 // If true, at shutdown the bookmarks in your menu and toolbar will
 // be exported as HTML to the bookmarks.html file.
 pref("browser.bookmarks.autoExportHTML",          false);
 
 // The maximum number of daily bookmark backups to