--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2904,17 +2904,17 @@ pref("dom.ipc.plugins.asyncdrawing.enabl
 #else
 // Allow the AsyncDrawing mode to be used for plugins in dev channels.
 pref("dom.ipc.plugins.asyncdrawing.enabled", true);
 // Force the accelerated path for a subset of Flash wmode values
 pref("dom.ipc.plugins.forcedirect.enabled", true);
 #endif
 
 #ifdef NIGHTLY_BUILD
-pref("dom.ipc.processCount", 2);
+pref("dom.ipc.processCount", 4);
 #else
 pref("dom.ipc.processCount", 1);
 #endif
 
 // WebExtensions only support a single extension process.
 pref("dom.ipc.processCount.extension", 1);
 
 // Disable support for SVG