Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Browser Bridge

A Chrome extension plus a local MCP server that lets AI agents (Antigravity, Claude Code, or any other) control your real, logged-in Chrome.

Compatibility: Not stated.

Grade B

Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

NETWORK_NO_FIXED_HOST OBFUSCATION_ENCODED_BLOB

Why this grade

  • NETWORK_NO_FIXED_HOST Low

    Makes a network call whose host is not written as a fixed address.

    extension/background.js, line 272 probe: ({ port }) => fetch(`http://127.0.0.1:${port}/`, { cache: "no-store" }).then((r) => "resolved " + r.status, (e) => "rejected: " + e.message),

  • OBFUSCATION_ENCODED_BLOB Low

    Contains a long base64 shaped string in a file that should be readable.

    extension/manifest.json, line 6 "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwYqMd/bPOmP18njOVCnSA0Akam3UW8tVu9OAmdxr9KspHNaZ+2IaT/zMmE3QMME0lM72grSqSN+QVPrWLav2H6Cx4IQUeXBbPq8McshiM10NrcOg4mD3YDhpNjLb8uD5

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Pass

    No shell or command execution found, and no extra permission was declared.

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    extension/background.js, line 272

    probe: ({ port }) => fetch(`http://127.0.0.1:${port}/`, { cache: "no-store" }).then((r) => "resolved " + r.status, (e) => "rejected: " + e.message),

    extension/background.js, line 291

    const r = await fetch(`http://${SERVER}/`, { cache: "no-store" });

    extension/background.js, line 305

    const sock = (ws = new WebSocket(`ws://${SERVER}`));

    Show more

    scripts/reload-extension.mjs, line 17

    const ws = new WebSocket(`ws://127.0.0.1:${PORT}`, { headers: { "x-bridge-peer": "1" } });

    server/index.js, line 171

    const sock = new WebSocket(`ws://127.0.0.1:${PORT}`, { headers: { "x-bridge-peer": "1" } });

  • Secrets

    Pass

    No read of a credential file or secret environment variable found.

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Concern

    contains an encoded blob in a file that should be readable.

    OBFUSCATION_ENCODED_BLOB

    extension/manifest.json, line 6

    "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwYqMd/bPOmP18njOVCnSA0Akam3UW8tVu9OAmdxr9KspHNaZ+2IaT/zMmE3QMME0lM72grSqSN+QVPrWLav2H6Cx4IQUeXBbPq8McshiM10NrcOg4mD3YDhpNjLb8uD5

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit 44d5ff840183. can reach a host that is not written as a fixed address. contains an encoded blob in a file that should be readable.

Date and source

Date checked:

View source

github.com

Commit graded: 44d5ff840183a09f96c27b0742928900eca903eb

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen