diff --git a/testing/user.js b/testing/user.js
index 2a10c3f..70ba414 100644
--- a/testing/user.js
+++ b/testing/user.js
@@ -656,6 +656,7 @@ user_pref("dom.keyboardevent.code.enabled", false);
 // -------------------------------------
 // Randomize Canvas
 user_pref("canvas.poisondata", true);
+user_pref("canvas.poisondata.interval", 60);
 // -------------------------------------
 // Disable Presentation API
 // user_pref("dom.presentation.enabled", false);