In-app web browser cause endless network calls

Bug Reports
1

Where does the bug appear (feature/product)?

Somewhere else…

Describe the Bug

First, congratulations to the team on all the new updates! However, my issue is that in the in-app web browser, I encounter endless network calls the moment i open my app.
the network errors :
http://localhost:58528/mcp-poll/tab_1d43e4c1aca0e1b757…

Steps to Reproduce

Open a web app using the in-app web browser

Expected Behavior

not fetching hundreds of calls a second

Screenshots / Screen Recordings

Screenshot 2025-10-29 234619.png
Screenshot 2025-10-29 234619.png959×410 25.3 KB

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.34 (user setup)
VSCode Version: 1.99.3
Commit: 45fd70f3fe72037444ba35c9e51ce86a1977ac10
Date: 2025-10-29T06:51:29.202Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26200

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

2

Hey, thanks for the report. Could you open the same localhost URL in Chrome or Edge and check the Network tab? If you see the same rapid polling there, it’s a bug in your app’s polling logic, not Cursor’s in‑app browser.

If it only happens in Cursor’s in‑app browser and not in external browsers, we’ll need to investigate further. Let me know what you find!