diff --git a/content/install-hook-usercss.js b/content/install-hook-usercss.js
index 80e837ea..944c235b 100644
--- a/content/install-hook-usercss.js
+++ b/content/install-hook-usercss.js
@@ -5,10 +5,10 @@ if (typeof self.oldCode !== 'string') {
   self.oldCode = (document.querySelector('body > pre') || document.body).textContent;
   chrome.runtime.onConnect.addListener(port => {
     if (port.name !== 'downloadSelf') return;
-    port.onMessage.addListener(({id, timer}) => {
+    port.onMessage.addListener(({id, force}) => {
       fetch(location.href, {mode: 'same-origin'})
         .then(r => r.text())
-        .then(code => ({id, code: timer && code === self.oldCode ? null : code}))
+        .then(code => ({id, code: force || code !== self.oldCode ? code : null}))
         .catch(error => ({id, error: error.message || `${error}`}))
         .then(msg => {
           port.postMessage(msg);
diff --git a/install-usercss/install-usercss.js b/install-usercss/install-usercss.js
index 82bb8b73..c074bf16 100644
--- a/install-usercss/install-usercss.js
+++ b/install-usercss/install-usercss.js
@@ -331,7 +331,11 @@
       onToggled(e) {
         if (e) isEnabled = e.target.checked;
         if (installed || installedDup) {
-          (isEnabled ? start : stop)();
+          if (isEnabled) {
+            check({force: true});
+          } else {
+            stop();
+          }
           $('.install').disabled = isEnabled;
           Object.assign($('#live-reload-install-hint'), {
             hidden: !isEnabled,
@@ -340,8 +344,8 @@
         }
       },
     };
-    function check() {
-      getData()
+    function check(opts) {
+      getData(opts)
         .then(update, logError)
         .then(() => {
           timer = 0;
@@ -398,10 +402,11 @@
           .then(tab => tab.url === initialUrl && location.reload())
           .catch(closeCurrentTab);
       });
-      return ({timer = true} = {}) => new Promise((resolve, reject) => {
+      return (opts = {}) => new Promise((resolve, reject) => {
         const id = performance.now();
         resolvers.set(id, {resolve, reject});
-        port.postMessage({id, timer});
+        opts.id = id;
+        port.postMessage(opts);
       });
     }
   }