Firefox DevTools MCP Server
by mozillaio.github.mozilla/firefox-devtools-mcpv0.10.4
Control and debug Firefox: navigate, fill forms, inspect network and console, profile.
context tax
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security
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cold start
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freshness
Active1d ago
Install Firefox DevTools MCP server
Install in Claude Code
claude mcp add firefox-devtools -- npx -y @mozilla/firefox-devtools-mcp --tool-preset developerInstall in Cursor
{
"mcpServers": {
"firefox-devtools": {
"command": "npx",
"args": [
"-y",
"@mozilla/firefox-devtools-mcp",
"--tool-preset",
"developer"
]
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).
Install in Claude Desktop
{
"mcpServers": {
"firefox-devtools": {
"command": "npx",
"args": [
"-y",
"@mozilla/firefox-devtools-mcp",
"--tool-preset",
"developer"
]
}
}
}Settings → Developer → Edit Config (claude_desktop_config.json), then restart.
Install in VS Code
{
"servers": {
"firefox-devtools": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@mozilla/firefox-devtools-mcp",
"--tool-preset",
"developer"
]
}
}
}Add to .vscode/mcp.json in your workspace.
Install in Windsurf
{
"mcpServers": {
"firefox-devtools": {
"command": "npx",
"args": [
"-y",
"@mozilla/firefox-devtools-mcp",
"--tool-preset",
"developer"
]
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
Configuration
| Variable | Required | Secret | Description |
|---|---|---|---|
| FIREFOX_HEADLESS | — | — | Set to true to run Firefox without a visible window. |
| START_URL | — | — | URL to open when the server starts. |
Freshness
Active — last maintenance signal 1d ago. The newest of the signals below sets the band.
Last commit (default branch)
2026-10-08 · 1d ago · GitHub
Latest release
2026-09-22 · 17d ago · GitHub · v0.10.4
Package published
no data · npm/PyPI
Registry entry updated
2026-09-22 · 17d ago · official registry · v0.10.4
FAQ
›How do I install the Firefox DevTools MCP server in Claude Code?
Run: claude mcp add firefox-devtools -- npx -y @mozilla/firefox-devtools-mcp --tool-preset developer. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.
›Does Firefox DevTools require an API key?
No required environment variables are declared in its published metadata.
›Can I use Firefox DevTools as a remote (hosted) MCP server?
No hosted endpoint is published; it runs locally over stdio.
›Is Firefox DevTools in the official MCP registry?
Yes, as io.github.mozilla/firefox-devtools-mcp.