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Show HN: Browser MCP – Automate your browser using Cursor, Claude, VS Code

browsermcp.io

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Re: Show HN: Browser MCP – Automate your browser using Cursor, Claude, VS Code

#52

Post by cadence- »

cadence- wrote: post #50

Doesn't work on Windows: 2025-04-07T18:43:26.537Z [browsermcp] [info] Initializing server... 2025-04-07T18:43:26.603Z [browsermcp] [info] Server started and connected successfully 2025-04-07T18:43:26.610Z [browsermcp] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} node:internal/e…

I was able to make it work like this:

1. Kill your Claude Desktop app

2. Click "Connect" in the browser extension.

3. Quickly start your Calude Desktop app.

It will work 50% of the time - I guess the timing must be just right for it to work. Hopefully, the developers can improve this.

Now on to testing :)

Re: Show HN: Browser MCP – Automate your browser using Cursor, Claude, VS Code

#53

Post by namuorg »

cadence- wrote: post #50

Doesn't work on Windows: 2025-04-07T18:43:26.537Z [browsermcp] [info] Initializing server... 2025-04-07T18:43:26.603Z [browsermcp] [info] Server started and connected successfully 2025-04-07T18:43:26.610Z [browsermcp] [info] Message from client: {"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"claude-ai","version":"0.1.0"}},"jsonrpc":"2.0","id":0} node:internal/e…

Can you try again?

There was another comment that mentioned that there's an issue with port killing code on Windows: https://news.ycombinator.com/item?id=43614145

I just published a new version of the @browsermcp/mcp library (version 0.1.1) that handles the error better until I can investigate further so it should hopefully work now if you're using @browsermcp/mcp@latest.

FWIW, Claude Desktop currently has a bug where it tries to start the server twice, which is why the MCP server tries to kill the process from a previous invocation: https://github.com/modelcontextprotocol/servers/issues/812

Re: Show HN: Browser MCP – Automate your browser using Cursor, Claude, VS Code

#55

Post by omneity »

tylergetsay wrote: post #9
hannofcart wrote: post #7

Earlier quoted context omitted.

Not OP but I suspect it is because of this (mentioned on their page): 'Avoids bot detection and CAPTCHAs by using your real browser fingerprint.'

I don't think remote debugging by itself on a normal chrome profile is detectable

Exposing Chrome CDP is a terrible idea from a security and privacy perspective. You get the keys to the whole kingdom (and expose them on a standard port with a well documented API). All security features of the web can be bypassed, and then some, as CDP exposes even more capabilities than chrome extensions and without any form of supervision.

Re: Show HN: Browser MCP – Automate your browser using Cursor, Claude, VS Code

#56

Post by tempest_ »

bhouston wrote: post #44

So the website claims: "Avoids bot detection and CAPTCHAs by using your real browser fingerprint." Yeah, not really. I've used a similar system a few weeks back (one I wrote myself), having AI control my browser using my logged in session, and I started to get Captcha's during my human sessions in the browser and eventually I got blocked from a bunch of websites. Now that I've stopped using my browser session in that…

The caveat with these things is usually "when used with high quality proxies".

Also I assume this extension is pretty obvious so it wont take long for CF bot detection to see it the same as playwrite or whatever else.

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