diff --git a/src/lib/components/toolbar/ToolBar.svelte b/src/lib/components/toolbar/ToolBar.svelte
index cad3d13..4d6e2f3 100644
--- a/src/lib/components/toolbar/ToolBar.svelte
+++ b/src/lib/components/toolbar/ToolBar.svelte
@@ -7,6 +7,7 @@
     import {viewMode} from "$lib/opml.svelte.js";
     import FeedModal from "$lib/components/modals/FeedModal.svelte";
     import AttributesModal from "$lib/components/modals/AttributesModal.svelte";
+    import { beforeNavigate } from '$app/navigation';
 
     let { view = $bindable() } = $props()
 
@@ -26,6 +27,12 @@
         window.removeEventListener('keyup', handleShortcuts);
     });
 
+    beforeNavigate((navigation) => {
+        if (opml.lastSaved < opml.lastModified && navigation.type === 'leave') {
+            navigation.cancel();
+        }
+    });
+
     let FileMenu = [
         {
             name: "Open file",
@@ -115,6 +122,7 @@
         a.href = url;
         a.download = "feeds.opml";
         a.click();
+        opml.lastSaved = new Date().getTime(); 
         URL.revokeObjectURL(url);
     }
 
diff --git a/src/lib/opml.svelte.js b/src/lib/opml.svelte.js
index 6a73d06..09dc83c 100644
--- a/src/lib/opml.svelte.js
+++ b/src/lib/opml.svelte.js
@@ -102,12 +102,15 @@ export class opmlDoc {
     outlineMap = $state(new SvelteMap());
     selectedItems = $state(new SvelteSet());
     numOfFeeds = $derived(Array.from(this.outlineMap.values()).reduce((acc, outline) => acc + outline.attributes.has("xmlUrl"), 0));
+    lastSaved = $state(new Date().getTime());
+    lastModified = $state(new Date().getTime());
 
     // private to avoid recursive updates
     _rawContent = $state("");
 
     set rawContent(value) {
         this._rawContent = value;
+        this.lastModified = new Date().getTime();
         this.debounceParse(value);
     }