extension-mcp vs modern-web-guidance
extension-mcp is a plugin bundle for AI coding tools published by Cezar Augusto. Marketplaces we read that list it: 1 (Community GitHub marketplaces). modern-web-guidance is a plugin bundle for AI coding tools published by GoogleChrome. Marketplaces we read that list it: 4 (Claude Code: claude-plugins-official, Claude: knowledge-work-plugins, Copilot CLI: github/awesome-copilot, Community GitHub marketplaces). As of our marketplace pass on 2026-10-13. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  modern-web-guidance | |
|---|---|---|
| Community marketplace extensiondev/mcp | Listed Version: 10.11.6 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Not listed |
| Claude Code: claude-plugins-official | Not listed | Listed Version: 0.0.190 Forks (GitHub): 92 Stars (GitHub): 2 468 Not marked · First seen |
| Claude: knowledge-work-plugins | Not listed | Listed Version: 0.0.190 Forks (GitHub): 92 Stars (GitHub): 2 468 Not marked · First seen |
| Copilot CLI: github/awesome-copilot | Not listed | Listed Version: 0.0.179 Forks (GitHub): 92 Stars (GitHub): 2 468 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | extension-mcp | modern-web-guidance |
|---|---|---|
| Marketplaces that list it (differs) | 1 (worse) | 4 (better) |
| Stars (GitHub) (differs) | 0 (worse) | 2 468 (better) |
| Forks (GitHub) (differs) | 0 (worse) | 92 (better) |
| Last release | Not published | Not published |
| Where it runs (differs) | On your machine (@extension.dev/mcp) | Installs as a plugin bundle |
| Transport | Not stated | Not stated |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 5 | 2 |
| Licence | Apache-2.0 | Apache-2.0 |
| Repository (differs) | github.com/extensiondev/mcp | github.com/googlechrome/modern-web-guidance |
| Changes in the last 7 days | 2 | 2 |
| First seen (differs) | 2026-10-13 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
extension-mcp
MCP tools for browser extension development: scaffold from 50+ templates, run the dev server with HMR, inspect the live DOM and logs, and build store-ready bundles for Chrome, Edge, and Firefox.
modern-web-guidance
Keep your coding agent up to date with the latest web best practices
How to run each
extension-mcp As a Claude Code plugin
/plugin marketplace add extensiondev/mcp
/plugin install extension-mcp@extensiondev-mcpmodern-web-guidance As a Claude Code plugin
/plugin install modern-web-guidance@claude-plugins-officialCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: extension-mcp · What it can do: modern-web-guidance · Compare two other plugins
Data comes from public marketplace files in GitHub repositories of their authors. Data comes from the public marketplace file https://github.com/anthropics/claude-plugins-official/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the public marketplace file https://github.com/github/awesome-copilot/blob/HEAD/.github/plugin/marketplace.json. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.