Index: chrome/content/ui/filters-subscriptionactions.js
===================================================================
--- a/chrome/content/ui/filters-subscriptionactions.js
+++ b/chrome/content/ui/filters-subscriptionactions.js
@@ -444,7 +444,7 @@
     if (save)
     {
       newTitle = subscriptionNode.getElementsByClassName("titleEditor")[0].value;
-      newTitle = newTitle.replace(/^\s+/, "").replace(/\s+$/, "");
+      newTitle = newTitle.trim();
     }
 
     let subscription = Templater.getDataForNode(subscriptionNode).subscription
Index: chrome/content/ui/subscriptionSelection.js
===================================================================
--- a/chrome/content/ui/subscriptionSelection.js
+++ b/chrome/content/ui/subscriptionSelection.js
@@ -239,7 +239,7 @@
 {
   if (!url)
     return null;
-  url = url.replace(/^\s+/, "").replace(/\s+$/, "");
+  url = url.trim();
 
   // Is this a file path?
   try {
@@ -266,7 +266,7 @@
     return false;
   }
 
-  let title = E("title").value.replace(/^\s+/, "").replace(/\s+$/, "");
+  let title = E("title").value.trim();
   if (!title)
     title = url;
 
Index: lib/filterClasses.js
===================================================================
--- a/lib/filterClasses.js
+++ b/lib/filterClasses.js
@@ -147,13 +147,13 @@
   if (/^\s*!/.test(text))
   {
     // Don't remove spaces inside comments
-    return text.replace(/^\s+/, "").replace(/\s+$/, "");
+    return text.trim();
   }
   else if (Filter.elemhideRegExp.test(text))
   {
     // Special treatment for element hiding filters, right side is allowed to contain spaces
     let [, domain, separator, selector] = /^(.*?)(#\@?#?)(.*)$/.exec(text);
-    return domain.replace(/\s/g, "") + separator + selector.replace(/^\s+/, "").replace(/\s+$/, "");
+    return domain.replace(/\s/g, "") + separator + selector.trim();
   }
   else
     return text.replace(/\s/g, "");
Index: lib/ui.js
===================================================================
--- a/lib/ui.js
+++ b/lib/ui.js
@@ -954,12 +954,12 @@
       mainSubscriptionURL = null;
 
     // Trim spaces in title and URL
-    title = title.replace(/^\s+/, "").replace(/\s+$/, "");
-    url = url.replace(/^\s+/, "").replace(/\s+$/, "");
+    title = title.trim();
+    url = url.trim();
     if (mainSubscriptionURL)
     {
-      mainSubscriptionTitle = mainSubscriptionTitle.replace(/^\s+/, "").replace(/\s+$/, "");
-      mainSubscriptionURL = mainSubscriptionURL.replace(/^\s+/, "").replace(/\s+$/, "");
+      mainSubscriptionTitle = mainSubscriptionTitle.trim();
+      mainSubscriptionURL = mainSubscriptionURL.trim();
     }
 
     // Verify that the URL is valid