diff --git a/src/lib/bookmarks/bookmarkstools.cpp b/src/lib/bookmarks/bookmarkstools.cpp
--- a/src/lib/bookmarks/bookmarkstools.cpp
+++ b/src/lib/bookmarks/bookmarkstools.cpp
@@ -147,6 +147,13 @@
     layout->addWidget(label);
     layout->addWidget(edit);
     layout->addWidget(folderButton);
+
+    if (Bookmarks().isBookmarked(url)) {
+        QLabel* warning_label = new QLabel(dialog);
+        warning_label->setText(Bookmarks::tr("<b>NOTE:</b> This site is already bookmarked"));
+        layout->addWidget(warning_label);
+    }
+
     layout->addWidget(box);
 
     label->setText(Bookmarks::tr("Choose name and location of this bookmark."));
@@ -191,6 +198,38 @@
 
     layout->addWidget(label);
     layout->addWidget(folderButton);
+
+    // -[1] Check for duplicate bookmarks
+    Bookmarks bookmarks;
+    bool duplicate_tabs_present = false;
+    QVector<QUrl> duplicate_urls;
+
+    foreach (WebTab* tab, tabWidget->allTabs(false)) {
+        if (!tab->url().isEmpty() && bookmarks.isBookmarked(tab->url())) {
+            if (!duplicate_urls.contains(tab->url())) {
+                duplicate_urls.push_back(tab->url());
+            } else {
+                duplicate_tabs_present = true;
+            }
+        }
+    }
+
+    if (duplicate_tabs_present) {
+        QLabel* warning_label = new QLabel(dialog);
+        warning_label->setText(Bookmarks::tr("<b>NOTE:</b> There are duplicate tabs"));
+        layout->addWidget(warning_label);
+    } else if (!duplicate_urls.isEmpty()) {
+        QLabel* warning_label = new QLabel(dialog);
+        warning_label->setText(Bookmarks::tr("<b>NOTE:</b> These tabs are already bookmarked"));
+        layout->addWidget(warning_label);
+
+        foreach (QUrl d_url, duplicate_urls) {
+            QLabel* dup_label = new QLabel(dialog);
+            dup_label->setText(d_url.toString());
+            layout->addWidget(dup_label);
+        }
+    } // -[1]
+
     layout->addWidget(box);
 
     label->setText(Bookmarks::tr("Choose folder for bookmarks:"));