diff --git a/platform/firefox/vapi-background-ext.js b/platform/firefox/vapi-background-ext.js
index 5d3ff8c5dfbdd..7fdc3dd5505f6 100644
--- a/platform/firefox/vapi-background-ext.js
+++ b/platform/firefox/vapi-background-ext.js
@@ -94,6 +94,10 @@ vAPI.Net = class extends vAPI.Net {
     }
 
     normalizeDetails(details) {
+        // https://github.com/uBlockOrigin/uBlock-issues/issues/3379
+        if ( details.proxyInfo?.proxyDNS && details.ip === '0.0.0.0' ) {
+            details.ip = null;
+        }
         const type = details.type;
         if ( type === 'imageset' ) {
             details.type = 'image';