--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -4250,16 +4250,23 @@ pref("layers.scroll-graph", false);
 // Set the default values, and then override per-platform as needed
 pref("layers.offmainthreadcomposition.enabled", false);
 // Whether to use the deprecated texture architecture rather than the new one.
 pref("layers.use-deprecated-textures", true);
 // Asynchonous video compositing using the ImageBridge IPDL protocol.
 // requires off-main-thread compositing.
 pref("layers.async-video.enabled",false);
 
+// For now, only nightly users get OMTC on windows.
+// Windows OMTC riding the trains is blocked on bugs 913503 and 904890,
+// and general stability.
+#if defined(XP_WIN) && defined(NIGHTLY_BUILD)
+pref("layers.offmainthreadcomposition.enabled", true);
+#endif
+
 #ifdef XP_MACOSX
 pref("layers.offmainthreadcomposition.enabled", true);
 pref("layers.use-deprecated-textures", false);
 pref("layers.async-video.enabled",true);
 #endif
 
 // ANDROID covers android and b2g
 #ifdef ANDROID