diff --git a/filebrowser_quantum/CHANGELOG.md b/filebrowser_quantum/CHANGELOG.md
index 96f1fa8e88..2830d0b05a 100644
--- a/filebrowser_quantum/CHANGELOG.md
+++ b/filebrowser_quantum/CHANGELOG.md
@@ -1,4 +1,15 @@
  
+## 1.5.3.1 (2026-08-29)
+- Fix "open parent directory" in Tools -> File Size Analyzer under Home
+  Assistant ingress. FileBrowser opened the parent folder in a new tab, which
+  lands on the raw ingress URL with no Home Assistant frontend around it to
+  keep the ingress session alive, so the new tab answered 401 instead of
+  showing the folder. The ingress vhost now turns that popup into a navigation
+  of the panel itself. The same fix covers the other tool views and the "go to
+  item" action on search results, which open a new tab the same way. Download
+  and preview popups, links pointing out of the add-on, and direct access on
+  port 8071 are unchanged.
+ 
 ## 1.5.3 (2026-08-29)
 - Update to latest version from gtsteffaniak/filebrowser (changelog : https://github.com/gtsteffaniak/filebrowser/releases)
  
diff --git a/filebrowser_quantum/config.yaml b/filebrowser_quantum/config.yaml
index c3be4e0041..3b289e8d3c 100644
--- a/filebrowser_quantum/config.yaml
+++ b/filebrowser_quantum/config.yaml
@@ -118,4 +118,4 @@ schema:
 slug: filebrowser_quantum
 udev: true
 url: https://github.com/alexbelgium/hassio-addons
-version: "1.5.3"
+version: "1.5.3.1"
diff --git a/filebrowser_quantum/rootfs/etc/nginx/servers/ingress.conf b/filebrowser_quantum/rootfs/etc/nginx/servers/ingress.conf
index f62b732e2d..119fe636f4 100644
--- a/filebrowser_quantum/rootfs/etc/nginx/servers/ingress.conf
+++ b/filebrowser_quantum/rootfs/etc/nginx/servers/ingress.conf
@@ -3,7 +3,7 @@ server {
 
     include /etc/nginx/includes/server_params.conf;
     include /etc/nginx/includes/proxy_params.conf;
-    
+
     client_max_body_size 0;
 
    location / {
@@ -12,6 +12,35 @@ server {
        proxy_send_timeout 30m;
        proxy_read_timeout 30m;
        proxy_pass         %%protocol%%://backend%%subpath%%;
+
+       # Tools -> File Size Analyzer (and the other tool views) open a result's
+       # parent folder with window.open(<absolute url>, '_blank'), because
+       # goToItem() takes its newTab argument from the context menu's
+       # showLimitedOptions flag, which those views always set. Behind ingress
+       # that popup lands on the raw /api/hassio_ingress/<token>/ url with no
+       # Home Assistant frontend around it to keep the ingress session alive,
+       # so the new tab answers 401 instead of showing the folder. Turn that
+       # popup into a navigation of the panel itself.
+       #
+       # The context menu's "go to item" action, which search results and the
+       # tool views also offer, hardcodes the same new tab and is fixed too.
+       #
+       # Scoped to the two prefixes goToItem() builds, "files/" and
+       # "public/share/", so the window.open calls that download or preview a
+       # file (they go to api/resources/download) keep their own tab: sending
+       # an inline raw file to location.assign would replace the whole app.
+       # A link out of the add-on keeps its own tab as well, unless a user
+       # points a sidebar link (or a link inside a file open in the editor) at
+       # this same instance's files/ or public/share/ route, which then also
+       # opens in the panel. Same shape as the komga add-on's ingress filter.
+       #
+       # Injected into the page's existing nonce-carrying inline script rather
+       # than next to <div id="app">: FileBrowser sends
+       # script-src 'self' 'nonce-<random>', so a standalone inline <script>
+       # would be blocked. If upstream ever drops that
+       # window.__pwaDeferredPrompt line the filter simply stops matching and
+       # the popup behaviour returns, which is the pre-fix state.
+       sub_filter "window.__pwaDeferredPrompt = null;" "window.__pwaDeferredPrompt = null;(function(){var o=window.open;window.open=function(u,n,f){try{var b=(window.globalVars||{}).baseURL;if(u&&n==='_blank'&&!f&&b){if(b.slice(-1)!=='/')b+='/';var t=new URL(u,location.href);if((t.protocol==='http:'||t.protocol==='https:')&&t.origin===location.origin&&(t.pathname.indexOf(b+'files/')===0||t.pathname.indexOf(b+'public/share/')===0)){location.assign(t.href);return window}}}catch(e){}return o.apply(window,arguments)}})();";
   }
 
 }