E2LLM vs Extensiondev MCP

In-depth architectural comparison of the E2LLM and Extensiondev MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose E2LLM when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore E2LLM Details

Choose Extensiondev MCP when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Extensiondev MCP Details

Feature & Specification Comparison

Specification	E2LLM Developer Tools	Extensiondev MCP extensiondev Developer Tools
Summary	E2LLM gives your AI eyes and hands in a real browser: structured perception (SiFR) plus action.	Build, run, inspect, and publish browser extensions from any MCP client. 28 tools, 11 browsers.
Category & Scope	Developer Tools	Developer Tools

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "e2llm": {
      "command": "npx",
      "args": [
        "-y",
        "skills"
      ]
    }
  }
}

{
  "mcpServers": {
    "mcp-291": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}

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