diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index 6954d01d38c6..8c9cd6a1b67f 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -2832,9 +2832,6 @@ pref("mozilla.widget.disable-native-theme", true);
 pref("gfx.color_management.mode", 0);
 #endif
 
-// Initialize default render-mode.
-pref("mozilla.widget.render-mode", -1);
-
 // Enable/Disable the geolocation API for content
 pref("geo.enabled", true);