diff --git a/gfx/thebes/gfxPrefs.h b/gfx/thebes/gfxPrefs.h
index 123090174dd4..df3a7ee8b177 100644
--- a/gfx/thebes/gfxPrefs.h
+++ b/gfx/thebes/gfxPrefs.h
@@ -617,7 +617,7 @@ private:
   DECL_GFX_PREF(Once, "layers.offmainthreadcomposition.force-disabled", LayersOffMainThreadCompositionForceDisabled, bool, false);
   DECL_GFX_PREF(Live, "layers.offmainthreadcomposition.frame-rate", LayersCompositionFrameRate, int32_t,-1);
   DECL_GFX_PREF(Live, "layers.omtp.force-sync",                LayersOMTPForceSync, bool, false);
-  DECL_GFX_PREF(Live, "layers.omtp.release-capture-on-main-thread", LayersOMTPReleaseCaptureOnMainThread, bool, true);
+  DECL_GFX_PREF(Live, "layers.omtp.release-capture-on-main-thread", LayersOMTPReleaseCaptureOnMainThread, bool, false);
   DECL_GFX_PREF(Live, "layers.orientation.sync.timeout",       OrientationSyncMillis, uint32_t, (uint32_t)0);
   DECL_GFX_PREF(Once, "layers.prefer-opengl",                  LayersPreferOpenGL, bool, false);
   DECL_GFX_PREF(Live, "layers.progressive-paint",              ProgressivePaint, bool, false);
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 662f8aff3e85..26c1a4607859 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5939,5 +5939,5 @@ pref("layers.omtp.enabled", true);
 #else
 pref("layers.omtp.enabled", false);
 #endif
-pref("layers.omtp.release-capture-on-main-thread", true);
+pref("layers.omtp.release-capture-on-main-thread", false);
 pref("layers.omtp.force-sync", false);