diff --git a/packages/playwright-core/src/server/frames.ts b/packages/playwright-core/src/server/frames.ts
index df8af491ba..1613356b56 100644
--- a/packages/playwright-core/src/server/frames.ts
+++ b/packages/playwright-core/src/server/frames.ts
@@ -377,7 +377,7 @@ export class FrameManager {
 
   onWebSocketRequest(requestId: string) {
     const ws = this._webSockets.get(requestId);
-    if (ws)
+    if (ws && ws.markAsNotified())
       this._page.emit(Page.Events.WebSocket, ws);
   }
 
diff --git a/packages/playwright-core/src/server/network.ts b/packages/playwright-core/src/server/network.ts
index 8b23078093..6120b4a025 100644
--- a/packages/playwright-core/src/server/network.ts
+++ b/packages/playwright-core/src/server/network.ts
@@ -476,6 +476,7 @@ export class Response extends SdkObject {
 
 export class WebSocket extends SdkObject {
   private _url: string;
+  private _notified = false;
 
   static Events = {
     Close: 'close',
@@ -489,6 +490,16 @@ export class WebSocket extends SdkObject {
     this._url = url;
   }
 
+  markAsNotified() {
+    // Sometimes we get "onWebSocketRequest" twice, at least in Chromium.
+    // Perhaps websocket is restarted because of chrome.webRequest extensions api?
+    // Or maybe the handshake response was a redirect?
+    if (this._notified)
+      return false;
+    this._notified = true;
+    return true;
+  }
+
   url(): string {
     return this._url;
   }