firefox-devtools-mcp (mozilla/firefox-devtools-mcp) is an MCP server listed on the M8ven Trust Index. It scores 89 out of 100, grade B. It declares 51 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
B
Emerging
89/100
10 days ago

firefox-devtools-mcp

Model Context Protocol server for Firefox DevTools - enables AI assistants to inspect and control Firefox browser through the Remote Debugging Protocol

→ mozilla/firefox-devtools-mcp· npm: @mozilla/firefox-devtools-mcp· listed on github_topic

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

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Who stands behind it

mozilla

Source: github_topic · also listed on npm, Glama

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Install from

GitHubnpmGlama

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// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configACCEPT_INSECURE_CERTSaccept-insecure-certs — ignore TLS errors (=true)
configANDROID_PACKAGE
configANDROID_WIPE_APP_DATAandroid-wipe-app-data — confirm that Android mode wipes all data of the target app. Required together with --android-device. (=true)
configAUTO_PROFILE
configCONNECT_EXISTINGconnect-existing — attach to an already-running Firefox instead of launching a new one (=true)
configDISABLE_NETWORK_BODY_COLLECTION
configENABLE_PRIVILEGED_CONTEXTenable-privileged-context — _deprecated, use --tool-preset mozilla or --tools ... privileged prefs._ Selects the mozilla tool preset. Requires MOZ_REMOTE_ALLOW_SYSTEM_ACCESS=1 (=true)
configENABLE_SCRIPTenable-script — _deprecated, use --tool-preset developer or --tools ... script debugging._ Selects the developer tool preset. (=true)
configFIREFOX_HEADLESSheadless — run without UI (=true)
configLOOKUP_MARIONETTE_PORT
configMARIONETTE_PORTmarionette-port — Marionette port for connect-existing mode, default 2828 ()
configMOZ_DISABLE_UPDATE_PROCESSING
configSTART_URLstart-url — open this URL on start ()
configTOOL_PRESETtool-preset — select which tool modules to enable: slim, basic (default), developer, mozilla, or all. See [Tool modules and presets](#tool-modules-and-presets). ()
configUNRESTRICTED_SAVE_PATHS
// quality suggestions

Dependencies

5 runtime dependencies (20 dev), 1 flagged: selenium-webdriver

Tool annotations

49/51 tools have annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

51/51 tools missing one or more hints — list_console_messages (missing: destructiveHint, idempotentHint, openWorldHint); clear_console_messages (missing: destructiveHint, idempotentHint, openWorldHint); enable_debugger (missing: destructiveHint, idempotentHint, openWorldHint), +48 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool test coverage

39/51 tools referenced in tests (76%)

Write tests that reference each tool by name so every tool has at least one test.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/mozilla/firefox-devtools-mcp)](https://m8ven.ai/mcp/mozilla/firefox-devtools-mcp)
Shows your grade and updates automatically. Prefer no grade? Append ?variant=verified to the badge URL.
commit: 78356d5f8b3076ac18f69d4b524a30f1fbcb1d7d
code hash: 425a2330c4a65918bd820c6009ce6412a8bada8d2b092366f01310b3663044d2
verified: 9/1/2026, 12:41:50 AM
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