mcp-debugger vs Firefox DevTools MCP
mcp-debugger and Firefox DevTools MCP are both MCP servers for debugging. mcp-debugger is published by debugmcp and Firefox DevTools MCP by mozilla. Both run locally (stdio). Both install in Claude Code, Codex, VS Code and Cursor. On GitHub, Firefox DevTools MCP has 518 stars and mcp-debugger has 179. Both were last active in Oct 2026. The table lines up where they differ (publisher, license and weekly downloads) and has the install commands for both. Everything here comes from the listings' public sources and is refreshed daily. mcp-debugger describes itself as: Step-through debugging for AI agents: breakpoints, stepping and live variables in nine languages. Firefox DevTools MCP: Control and debug Firefox: navigate, fill forms, inspect network and console, profile. Licenses: mcp-debugger MIT, Firefox DevTools MCP MIT OR Apache-2.0.
Updated Oct 26, 2026 · Built from catalog data; how we rank and grade
mcp-debugger
debugmcp
Step-through debugging for AI agents: breakpoints, stepping and live variables in nine languages
Firefox DevTools MCP
mozilla
Control and debug Firefox: navigate, fill forms, inspect network and console, profile.
Who should pick which
- Firefox DevTools MCP has the larger community: 518 GitHub stars against 179.
From listing data only. We don't pick a winner on security beyond the grades; read how grades work.
Side by side
| Fact | mcp-debugger | Firefox DevTools MCP |
|---|---|---|
| Type | Connector | Connector |
| Publisher | debugmcp | mozilla |
| License | MIT | MIT OR Apache-2.0 |
| Pricing | Not stated | Not stated |
| Runs | Local (stdio) | Local (stdio) |
| Auth | No auth | No auth |
| Hosts supported | Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop | Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop |
| Tools | 32 | 57 |
| Security grade | –Security: not graded yet | –Security: not graded yet |
| Freshness grade | AFreshness: A | AFreshness: A |
| GitHub stars | 179 | 518 |
| Weekly downloads | 2,327 | 4,643 |
| Last release | Sep 30, 2026 | Oct 16, 2026 |
| Last activity | Oct 21, 2026 | Oct 22, 2026 |
Facts from each listing's public sources, checked daily. Tool lists arrive with tool scans.
Install
mcp-debugger
claude mcp add mcp-debugger -- npx -y @debugmcp/mcp-debugger@0.25.1 stdio
Firefox DevTools MCP
claude mcp add firefox-devtools-mcp -- npx -y @mozilla/firefox-devtools-mcp@0.10.6 --tool-preset developer
Settings it needs
FIREFOX_HEADLESS· Set to true to run Firefox without a visible window.START_URL· URL to open when the server starts.
Also consider
- 0.708score
Chrome DevTools MCP
ChromeDevTools
MCP server for Chrome DevTools
ConnectorAFreshness: ALocal★ 54.1KClaude Code +5 - 0.645score
.NET Debugger for MCP
nevse
Give an AI agent a real.NET debugger: breakpoints, stepping, locals, expression evaluation.
ConnectorAFreshness: ALocal★ 9Claude Code +5 - 0.631score
STM32 GDB Debugger
Zeraissh
Debug STM32 firmware on real hardware via GDB + OpenOCD/ST-Link/J-Link with decoded results.
ConnectorAFreshness: ALocal★ 2↓ 158/wkClaude Code +5
Questions
- Is mcp-debugger or Firefox DevTools MCP more popular?
- Firefox DevTools MCP has more GitHub stars (518 against 179). Stars measure attention, not quality, so check freshness and docs too.
- Do mcp-debugger and Firefox DevTools MCP work with Claude Code?
- Yes, both list a Claude Code install; the commands are on this page.
- Which one runs without a local install?
- Both run locally on your machine.
Related
Cite this page
mcp-debugger vs Firefox DevTools MCP. Agent Mart. https://agentmart.dev/compare/debugmcp-mcp-debugger-vs-mozilla-firefox-devtools-mcp (last updated 2026-10-26)