diff --git a/web/src/app.jsx b/web/src/app.jsx
index 932ee72..c3ad50f 100644
--- a/web/src/app.jsx
+++ b/web/src/app.jsx
@@ -300,11 +300,14 @@ function App() {
     nickRef.current = nick;
   }, [nick]);
 
-  // Persist joined channels.
+  // Persist joined channels, once logged in: before then only the
+  // Server tab exists, and writing would erase the saved channels
+  // that onLogin rejoins.
   useEffect(() => {
+    if (!loggedIn) return;
     const channels = tabs.filter((t) => t.type === "channel").map((t) => t.name);
     localStorage.setItem("neoirc_channels", JSON.stringify(channels));
-  }, [tabs]);
+  }, [loggedIn, tabs]);
 
   // Clear unread on tab switch.
   useEffect(() => {
@@ -463,6 +466,15 @@ function App() {
 
           break;
         }
+        case "MODE": {
+          // The body is the change, with its value where it has one:
+          // ["+o bob"], ["+m"], ["+k", "secretpass"].
+          const modes = Array.isArray(msg.body) ? msg.body.join(" ") : "";
+          const text = `${msg.from} sets mode ${modes} on ${msg.to}`;
+          if (msg.to) addMessage(msg.to, { ...base, text, system: true });
+
+          break;
+        }
         case 353: {
           // RPL_NAMREPLY — each name is a hostmask (nick!user@host),
           // prefixed with @ for an operator or + for a voiced member.
@@ -759,6 +771,11 @@ function App() {
 
   const onLogin = useCallback(
     async (userNick, isResumed) => {
+      // Read before setLoggedIn(true): from then on the effect under
+      // "Persist joined channels" writes the open channel tabs over it.
+      const saved = JSON.parse(
+        localStorage.getItem("neoirc_channels") || "[]",
+      );
       setNick(userNick);
       setLoggedIn(true);
       addSystemMessage("Server", `Connected as ${userNick}`);
@@ -783,9 +800,6 @@ function App() {
       }
 
       // Fresh session — join any previously saved channels.
-      const saved = JSON.parse(
-        localStorage.getItem("neoirc_channels") || "[]",
-      );
       for (const ch of saved) {
         try {
           await api("/messages", {