diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 6dd82c9bf5..0138430e50 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2495,12 +2495,6 @@ pref("layout.css.transition.enabled", true);
 // Is support for CSS Filters enabled?
 pref("layout.css.filters.enabled", true);
 
-// Is support for CSS Animation enabled?
-pref("layout.css.animation.enabled", true);
-
-// Is support for CSS Transition enabled?
-pref("layout.css.transition.enabled", true);
-
 // Is support for scrollbar-width property enabled?
 pref("layout.css.scrollbar-width.enabled", true);