Firefox DevTools MCP (BAM-DevCrew/maxerviker-firefox-devtools-mcp) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: we have no way to read this server ourselves. No publisher has claimed this listing.
Model Context Protocol server for automating Firefox via WebDriver BiDi, enabling page navigation, snapshots, input, network monitoring, and console debugging for AI agents in MCP clients.
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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BAM-DevCrew
Source: Glama
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ACCEPT_INSECURE_CERTSaccept-insecure-certs — ignore TLS errors (=true)ANDROID_PACKAGEAUTO_PROFILECONNECT_EXISTINGconnect-existing — attach to an already-running Firefox instead of launching a new one (=true)ENABLE_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)ENABLE_SCRIPTenable-script — _deprecated, use --tool-preset developer or --tools ... script debugging._ Selects the developer tool preset. (=true)FIREFOX_HEADLESSheadless — run without UI (=true)MARIONETTE_PORTmarionette-port — Marionette port for connect-existing mode, default 2828 ()MOZ_DISABLE_UPDATE_PROCESSINGSTART_URLenv =https://example.com \TOOL_PRESETtool-preset — select which tool modules to enable: slim, basic (default), developer, mozilla, or all. See [Tool modules and presets](#tool-modules-and-presets). ()UNRESTRICTED_SAVE_PATHSDependencies
25 dependencies, 2 flagged: selenium-webdriver, @types/selenium-webdriver
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
52/52 tools missing one or more hints — list_console_messages (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); clear_console_messages (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); enable_debugger (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +49 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
38/52 tools referenced in tests (73%)
Write tests that reference each tool by name so every tool has at least one test.
Domain consistency
npm scope @mozilla doesn't match GitHub owner bam-devcrew
Use the same org name across GitHub, npm, and your homepage so users can verify the publisher.
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