diff --git a/user-script/background.js b/user-script/background.js
index 5087f73..3df64c2 100644
--- a/user-script/background.js
+++ b/user-script/background.js
@@ -2,7 +2,10 @@
 
 var registered = null;
 
-async function register(hosts, code) {
+async function registerScript(message) {
+
+  let hosts = message.hosts;
+  let code = message.code;
 
   if (registered) {
     registered.unregister();
@@ -15,3 +18,5 @@ async function register(hosts, code) {
   });
 
 }
+
+browser.runtime.onMessage.addListener(registerScript);
diff --git a/user-script/popup/user-script.js b/user-script/popup/user-script.js
index d08aca3..8a544ee 100644
--- a/user-script/popup/user-script.js
+++ b/user-script/popup/user-script.js
@@ -9,9 +9,11 @@ const defaultCode = "document.body.innerHTML = '<h1>This page has been eaten<h1>
 hostsInput.value = defaultHosts;
 codeInput.value = defaultCode;
 
-async function registerScript() {
-  let background = await browser.runtime.getBackgroundPage();
-  background.register(hostsInput.value.split(","), codeInput.value)
+function registerScript() {
+  browser.runtime.sendMessage({
+    hosts: hostsInput.value.split(","),
+    code: codeInput.value
+  });
 }
 
 document.querySelector("#register").addEventListener('click', registerScript);