Is Extension safe and trustworthy?

tashan scores Extension on public evidence — tashan score 49.0/100, it is currently active. Audit scope: OSV advisories, install-time scripts, build provenance and declared permission surface. We do not review source code or execute the capability.

How do I install Extension?

Configure it from its source repository — it is a remote / registry server.

Who maintains Extension?

3 GitHub contributors, source: extensiondev/mcp.

‹ The Index

Extension

plugin

MCP tools for browser extension development: scaffold from 50+ templates, run the dev server with HMR, inspect the live DOM and logs, and publish store-ready builds for Chrome, Edge, and Firefox.

Works with: Claude Code (native)
native: this artifact type is that client's own format

Category: Dev Tools & CI — see all ranked ›

Work: Agent development

Who it is for: AI engineer

Install (Claude Code):

/plugin marketplace add extensiondev/mcp
/plugin install extension-mcp@extensiondev-mcp

tashan score: 49.0
Adoption: 1 repos
Upkeep: 100.0
Freshness: 100.0
Evidence coverage: 84% of the inputs this score can use — the rest are unknown, and the score is discounted for it
Health: active
GitHub stars: 1
Contributors: 3
License: Apache-2.0

Security audit

Not scanned yet. We audit npm-published capabilities for known advisories, install-time scripts and permission surface; this one has no npm package we can resolve, or has not reached the queue.

What changed recently

2026-09-13 the tashan score for extension-mcp rose to 49.0, from 41.0 Upkeep, freshness or adoption moved enough to change how this measures.

You are reading this because you came looking. tashan Pro gives tashan doctor the history behind it, so a run over your own config says which of YOURS moved.

You searched for one. Check the rest of your stack:

npx tashan-cli doctor

Reads the config already on your machine and names what is dead, deprecated or running code at install time. No account, nothing uploaded.

tashan Pro$6/mo

We recorded 1 change to Extension in the last 45 days. Pro tells you on the day — for the servers in your own config, not the ones you thought to look up.

The whole series behind any row, back to the first day we measured it
The replacement, named — not just the news that something died
tashan doctor over your own config, on your own machine

Start a 7-day trial › Everything measured on this page stays free.

Show your score

Measured this well? Put the live badge in your README — it updates as the score does.

[![tashan](https://tashan.sh/badge/plugin-extensiondev-mcp-extension-mcp.svg)](https://tashan.sh/capability/plugin-extensiondev-mcp-extension-mcp.html)

source ↗ · plugin:extensiondev/mcp/extension-mcp

Already running this? Check your whole config — free, in your browser, nothing installed. Or npx tashan-cli doctor locally, which sends nothing at all.

Measured 2026-09-13 · scorer s5 · how · something wrong here?