Newton Browser

Name: Newton Browser
Author: Koala-Studios

by Koala-Studiosversion 0.4.1i★ –iRuns on your computer

Registry nameio.github.Koala-Studios/newton-browser

Install

Overview

Description from the maker (original English)

Local-only Chrome and Edge control for MCP clients through an origin-scoped extension.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Web & browsers

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "newton-browser": {
      "command": "npx",
      "args": [
        "-y",
        "newton-browser"
      ]
    }
  }
}

Run this in your terminal

claude mcp add newton-browser -- npx -y newton-browser

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "newton-browser": {
      "command": "npx",
      "args": [
        "-y",
        "newton-browser"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "newton-browser": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "newton-browser"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Koala-Studios, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Web & browsersi

More stars than 0% of the other 881 servers in this category
Published to the registry more recently than 21% of the other 881 servers in this category
Basic checks equal to or better than 100% of the other 881 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Newton Browser safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.4.1) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Browser Use, Chrome DevTools MCP, MCP Server Browser

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Browser Use

by browser-use

Lets AI do web tasks for you, such as filling forms, searching and extracting data, in the maker’s cloud browsers or on your computer.

Computer or cloud★ 120,087MITUpdated 17 days ago

Install

Chrome DevTools MCP

by ChromeDevTools

Lets AI use Chrome’s developer tools to inspect pages, find what makes them slow and spot errors. Made by the Chrome DevTools team.

Runs on your computer★ 54,821Apache-2.0Updated 16 days ago

Install

MCP Server Browser

by bytedance

MCP server for browser use access

Runs on your computer★ 39,550Apache-2.0Updated 14 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Newton Browser

Newton Browser is a local MCP browser-control product for agents. Each session launches an isolated Chrome or Edge process and controls it through inherited private CDP pipes. By default browser traffic uses Chromium's normal networking with no Newton proxy, origin allowlist, request interception, or resource filtering.

The default runtime requires no browser extension, relay, daemon, debug TCP port, database, telemetry, hosted service, or model-provider integration.

Status

The default source runtime now uses the replacement shared engine, with isolated workers from a shared Newton login source and an optional thin existing-browser adapter. Native actions, precise editing, contextual controls, records/documents, screenshots, tab ownership and update foundations are implemented. This is an unreleased development checkpoint, not completed real-world acceptance.

The legacy direct runtime is retired (2026-09-25): the session engine is the only action, receipt and ref authority. Build, typecheck, boundary lint and the full suite pass. Feedback/reading refinements, platform and authenticated task QA, and three unchanged packed release gates remain open. See the current progress ledger, remaining roadmap and consolidation record.

Version 0.7.2 is published as a GitHub prerelease tarball verified on macOS Chrome; Windows and Linux receipts for it remain open. No npm or browser-store release exists.

Newton implements only stateless MCP 2026-07-28 over newline-delimited stdio JSON. Clients send protocol version and capabilities in every request. Newton exposes no legacy handshake or framing mode.

Requirements

Node.js 24 or newer.
A current local Chrome or Edge installation.
An MCP client that supports MCP 2026-07-28, local stdio servers, and image content.

Build and connect

pnpm install --frozen-lockfile

pnpm build node apps/mcp-server/dist/index.js doctor --live

That is enough for ephemeral sessions: Newton discovers Chrome or Edge and creates a fresh isolated identity per session. Optional setup only selects a default browser:

node apps/mcp-server/dist/index.js setup --browser chrome

Every owned session is an isolated copy of a shared login source (default unless the session names another). To sign in once for later sessions, open the source's visible browser, sign in personally, and confirm:

node apps/mcp-server/dist/index.js source login --id default --browser chrome

Newton never asks an agent to enter or retrieve credentials. The published sign-in becomes the source's next generation; running sessions keep their own copies, and nothing a session does is merged back.

MCP configuration

"mcpServers": { "newton-browser": { "command": "node", "args": ["C:\\absolute\\path\\newton-browser\\apps\\mcp-server\\dist\\index.js"] } } }

The local installer can update Codex configuration or print a generic entry:

node apps/mcp-server/dist/index.js install codex --dry-run

node apps/mcp-server/dist/index.js install generic

Codex installation enables Codex's mcp_2026_07_28 feature, pins CODEX_MCP_PROTOCOL_VERSION=2026-07-28, and verifies the exact candidate's live stateless discovery, self-reported package version, and required browser-tool catalog before atomically replacing its configuration. The resulting entrypoint/version pair is pinned; incompatible or stale candidates cannot displace a working install.

Agent workflow

Tools (tools/list is authoritative): browser.session.start, browser.observe, browser.act, browser.command, browser.document.read, browser.document.continue, browser.screenshot, browser.console, browser.network, browser.pages.list, browser.page.select, browser.sessions.list, browser.session.stop, and the operator-selected existing-browser tools browser.existing.discover and browser.existing.setup.

A normal loop:

browser.session.start with a complete URL returns the session, its first page and nextCommandId.
browser.observe returns bounded controls with refs; records mode reads links, tables and forms; browser.document.read reads text with a continuation cursor.
browser.act performs one typed action or a sequence and returns a receipt: dispatch, postcondition, and the next state when it changed. Reuse a commandId only for the identical command; after an uncertain receipt, reconcile with browser.command rather than replaying.
browser.session.stop ends the session independently of its queue.

Popups and new tabs are attached as session pages without changing the selected page; browser.pages.list and browser.page.select move between them. A hung renderer is reopened on the same page and the receipt says so. Console and network recording is opt-in because enabling it is visible to pages.

Identities and opaque profile import

Identities are the store's opaque browser profiles; login sources and session copies are built on them. Operator utilities:

newton-browser identity create --browser chrome

newton-browser identity list newton-browser identity lease-inspect --id nbi_ newton-browser identity lease-recover --id nbi_ newton-browser identity delete --id nbi_ newton-browser identity import --browser chrome --user-data-root "C:\path\to\User Data" --profile-directory Default

Import byte-copies a narrow allowlist of authentication-bearing files from a closed, stable local profile and never modifies the source. Passwords, autofill, history, downloads, extensions, sessions, service workers, and caches are excluded. Browser encryption may prevent copied authentication from remaining usable; Newton does not bypass that protection.

Security boundary

Browsers run on inherited private CDP pipes: no debug port, relay or extension in owned mode.
A hosting process can restrict owned browsers to public internet addresses (NEWTON_BROWSER_EGRESS=public); otherwise networking is ordinary Chromium networking.
Page content is untrusted data; it cannot authorize effects or select local files.
Screenshots mask password and sensitive-autocomplete fields across frames and shadow roots, plus any explicit sensitive zones.
Network response bodies are available only as bounded text from the page's own origin; headers are never kept.

See Security, Privacy, and MCP clients.

Development and release

pnpm build

pnpm lint pnpm typecheck pnpm test pnpm eval pnpm eval:agent-cost pnpm pack:check pnpm eval:real-sites pnpm release:check

Run pnpm eval:real-sites once per required browser/platform. Release then requires pnpm release:check to pass from the exact packed candidate three consecutive times on Windows and Linux with no skipped critical tests, plus the pinned Linux Chrome for Testing matrix and matching cross-platform tarball hashes.

Repository layout

apps/mcp-server/      stateless stdio MCP host and owned-browser runtime

packages/core/ schemas, redaction, provenance, and safety policy packages/driver/ strict TypeScript CDP driver scripts/ builds, release checks, and live harnesses skills/newton-browser agent operating guidance test/ fixtures, regressions, and bounded evidence

License

The source is licensed under the MIT License. Publishing or distributing a Newton Browser release remains a separate maintainer-controlled action.

Newton Browser

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Web & browsersi

Common questions

Alternatives

Browser Use

Chrome DevTools MCP

MCP Server Browser

README from the maker

Newton Browser

Status

Requirements

Build and connect

MCP configuration

Agent workflow

Identities and opaque profile import

Security boundary

Development and release

Repository layout

License