diff --git a/source/src/devtools/util.js b/source/src/devtools/util.js
deleted file mode 100644
index 15060a3..0000000
--- a/source/src/devtools/util.js
+++ /dev/null
@@ -1,12 +0,0 @@
-let index = 0;
-setInterval(() => {
-  let msg = "util: " + index++;
-  // chrome.extension.sendMessage(msg;
-  if (typeof aa !== undefined) {
-    msg = aa;
-  }
-  window.postMessage({type: 1, msg: msg}, "*");
-}, 2000);
-
-
-