# Extension

> 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.

## Facts
- Page: https://tashan.sh/capability/plugin-extensiondev-mcp-extension-mcp
- tashan id: plugin:extensiondev/mcp/extension-mcp
- Source: https://github.com/extensiondev/mcp
- Type: plugin
- Category: devtools
- tashan score: 45.0 / 100
- Adoption: 11.0
- Upkeep: not measured
- Freshness: 100.0
- Evidence coverage: 59% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- GitHub stars: 1
- License: Apache-2.0
- Official: no

## Install

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

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-22 by tashan (https://tashan.sh) from public evidence. Scorer s5.