diff --git a/install-usercss/install-usercss.js b/install-usercss/install-usercss.js
index 889da8b8..afbd6419 100644
--- a/install-usercss/install-usercss.js
+++ b/install-usercss/install-usercss.js
@@ -307,9 +307,9 @@
 
     // set updateUrl
     const checker = $('.set-update-url input[type=checkbox]');
-    // prefer the installation URL unless drag'n'dropped on the manage page
+    // only use the installation URL if not specified in usercss
     const installationUrl = (params.get('updateUrl') || '').replace(/^blob.+/, '');
-    const updateUrl = new URL(installationUrl || style.updateUrl || DUMMY_URL);
+    const updateUrl = new URL(style.updateUrl || installationUrl || DUMMY_URL);
     if (dup && dup.updateUrl === updateUrl.href) {
       checker.checked = true;
       // there is no way to "unset" updateUrl, you can only overwrite it.
@@ -335,7 +335,7 @@
 
     // live reload
     const setLiveReload = $('.live-reload input[type=checkbox]');
-    if (updateUrl.protocol !== 'file:') {
+    if (!installationUrl || !installationUrl.startsWith('file:')) {
       setLiveReload.parentNode.remove();
     } else {
       setLiveReload.addEventListener('change', () => {
diff --git a/js/usercss.js b/js/usercss.js
index 360743c0..deebcbbb 100644
--- a/js/usercss.js
+++ b/js/usercss.js
@@ -7,7 +7,7 @@ const usercss = (() => {
     author: undefined,
     description: undefined,
     homepageURL: 'url',
-    // updateURL: 'updateUrl',
+    updateURL: 'updateUrl',
     name: undefined,
   };
   const RX_META = /\/\*!?\s*==userstyle==[\s\S]*?==\/userstyle==\s*\*\//i;