--- title: "Firefox DevTools MCP: review, setup & limitations · Undominated.ai" canonical: https://undominated.ai/mcp-servers/firefox-devtools/ description: "Automate and inspect a local Firefox browser through WebDriver BiDi and selectable tool presets." --- # Firefox DevTools MCP: review, setup & limitations · Undominated.ai > Automate and inspect a local Firefox browser through WebDriver BiDi and selectable tool presets. [← Explore all mcp servers](/mcp-servers/) BROWSER AUTOMATION / Mozilla # Firefox DevTools MCP Automate and inspect a local Firefox browser through WebDriver BiDi and selectable tool presets. [See setup guidance ↓](#setup)[Original source ↗](https://github.com/mozilla/firefox-devtools-mcp) SOURCE REVIEW Reviewed 2026-10-14 Evidence 4 linked sources Publisher Mozilla Licence [MIT ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/LICENSE-MIT) Revision dff834a995bc [Read what was—and wasn’t—checked ↓](#review) “Automate and inspect a local Firefox browser through WebDriver BiDi and selectable tool presets.” [Mozilla · upstream description ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/README.md) Our analysis follows below. 01 / THE REASONING ## Why this made the selection. - Automate and inspect a local Firefox browser through WebDriver BiDi and selectable tool presets. - The setup documentation makes this operating boundary explicit: Browser tools act on reachable pages and browser session state. Broader developer presets add script, network and debugging access. ### A good fit for - Automate and inspect a local Firefox browser through WebDriver BiDi and selectable tool presets. - Run the local package with Node.js >=20.19.0 and Firefox installed; use a dedicated profile and --tool-preset slim when script evaluation is not needed. ### Weigh up before choosing - The basic preset includes evaluate_script; internal Mozilla-only modules are omitted from the public package even if requested. Android mode wipes the target app data before each session. - Package/container parity with the pinned source and transitive dependency security were not established. 02 / THE REVIEW RECORD ## What we actually inspected. Source review has boundaries. A clear record is more useful than a “safe” badge. ### Material inspected - README.md - LICENSE-MIT - package.json - src/cli.ts ### Our findings - Browser tools act on reachable pages and browser session state. Broader developer presets add script, network and debugging access. - The basic preset includes evaluate_script; internal Mozilla-only modules are omitted from the public package even if requested. Android mode wipes the target app data before each session. ### Not established by this review - No server installation, authentication, live tool execution or isolation test was performed. - Package/container parity with the pinned source and transitive dependency security were not established. The review applies to the material and revision named here. A newer upstream release can change its behavior. 03 / PUT IT TO WORK ## Connect a server deliberately. [Upstream setup instructions ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/README.md) DOCUMENTED COMMAND npx @mozilla/firefox-devtools-mcp@latest Copy command ↗ Copying does not execute this command. It may retrieve a newer version than the reviewed source. - Run the local package with Node.js >=20.19.0 and Firefox installed; use a dedicated profile and --tool-preset slim when script evaluation is not needed. - Verify the connected account, available tools and target resource before authorizing mutations. ### Before you start - Pinned package Node.js requirement: >=20.19.0. - A compatible local process MCP client. - Browser tools act on reachable pages and browser session state. Broader developer presets add script, network and debugging access. ### Compatibility MCP clients that can launch the documented local process. ### Implementation TypeScript ### Transports stdio ### Local process with service or workstation access - Browser tools act on reachable pages and browser session state. Broader developer presets add script, network and debugging access. ### Cost model Publisher service entitlements, API usage and infrastructure charges apply where applicable; the MCP source licence does not include external services. 04 / FOLLOW THE EVIDENCE ## The source trail. Our notes are separate from the original resource. Check upstream before adopting a new version. - [Pinned publisher README and migration notices ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/README.md) Checked 2026-10-14 https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/README.md Supports: description, setup, capabilities, review, limitations - [Licence text at the reviewed commit ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/LICENSE-MIT) Checked 2026-10-14 https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/LICENSE-MIT Supports: license - [Pinned package metadata ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/package.json) Checked 2026-10-14 https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/package.json Supports: install, language, review - [Pinned implementation inspected for launch or permission boundary ↗](https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/src/cli.ts) Checked 2026-10-14 https://github.com/mozilla/firefox-devtools-mcp/blob/dff834a995bc5e4853c03103e0b83310e7a57a11/src/cli.ts Supports: review, install, access, limitations KEEP COMPARING ## Other approaches to consider. Related by category or shared topics. These are alternatives to inspect, not a measured quality order. [### Hyperbrowser MCP Server ↗ Scrape and crawl pages, extract structured web data and run hosted browser-agent sessions.](/mcp-servers/hyperbrowser/)[### Cloudflare Playwright MCP ↗ A Worker-hosted Playwright MCP server for Cloudflare Browser Rendering.](/mcp-servers/cloudflare-playwright/)[### Playwright MCP ↗ Gives an assistant persistent browser tools for inspecting page structure, interacting with controls and collecting browser evidence.](/mcp-servers/playwright/) [AI Tools ↗](/tools/)[Skills ↗](/skills/)[Agents ↗](/agents/)[MCP Servers ↗](/mcp-servers/)[Workflows ↗](/workflows/) ## Continue your investigation - [Inspect resource evidence](/tools/) - [Choose a host](/agents/) - [Inspect reusable workflows](/skills/) - [Use Undominated data](/api/)