diff --git a/extensions/chromium/runet-censorship-bypass/src/extension-full/80-error-menu.js b/extensions/chromium/runet-censorship-bypass/src/extension-full/80-error-menu.js
index 638b6de..207df06 100644
--- a/extensions/chromium/runet-censorship-bypass/src/extension-full/80-error-menu.js
+++ b/extensions/chromium/runet-censorship-bypass/src/extension-full/80-error-menu.js
@@ -4,9 +4,12 @@
 
   const timeouted = window.utils.timeouted;
 
-  const proxySideErrors = [
-    'net::ERR_TUNNEL_CONNECTION_FAILED',
-  ];
+  const isProxySideError = (details) =>
+    /* About !main_frame: Main frame websocket errors are followed by webnavigation errors
+       which chrome-internals code resets the state of the popup.
+    */
+    details.error === 'net::ERR_TUNNEL_CONNECTION_FAILED' && details.type !== 'main_frame' ||
+    details.error === 'NS_ERROR_CONNECTION_REFUSED' && Boolean(details.proxyInfo);
 
   const urlToA = (url) => new URL(url).host.link(
     encodeURIComponent(url),
@@ -14,9 +17,7 @@
 
   const isProxyErrorHandledAsync = async (details) => {
 
-    if (!proxySideErrors.includes(details.error) || details.type === 'main_frame') {
-      // Main frame websocket errors are followed by webnavigation errors
-      // which chrome-internals code resets the state of the popup.
+    if (!isProxySideError(details)) {
       return;
     }
     let fromPageHref = '';