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firefox-devtools-mcp

firefox-devtools-mcp

by mozilla
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TypeScript
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Deploy Server
One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

TDQS

A3.5/5.0

Scored across 35 tools

Disambiguation4/5

Most tools target a clearly distinct resource+action (tabs, snapshots, screenshots, dialogs, downloads, extensions), and the descriptions explicitly disambiguate the risky pairs (fill_by_uid vs type_text vs press_key, get_page_text vs evaluate_script vs take_snapshot). The remaining overlaps are mild: three different read/extraction paths and two screenshot variants, plus clear_snapshot/resolve_uid_to_selector which are niche UID helpers an agent may rarely reach for.

Naming Consistency4/5

The dominant pattern is consistent snake_case verb_noun (get_page_text, list_pages, close_page, set_viewport_size, click_by_uid). Deviations are minor but real: screencast_start/screencast_stop use noun_verb ordering, and screenshot_page/print_page treat the noun as the verb, while new_page uses an adjective-first form.

Tool Count3/5

At 35 tools this is heavy relative to the 3-15 sweet spot, even though the browser-automation domain genuinely spans tabs, interaction, capture, downloads, extensions, and diagnostics. A few tools feel like marginal additions (clear_snapshot, resolve_uid_to_selector, get_firefox_info) that could be folded into snapshot/info tooling to slim the surface.

Completeness4/5

Coverage is broad and coherent: navigation and history, tab lifecycle, DOM snapshot plus UID-driven interaction, screenshots/PDF, downloads, dialogs, extensions, viewport, screencasts, JS evaluation, and Firefox log output. Gaps are minor rather than blocking: no cookie/localStorage management, no network request inspection or interception, and no explicit accessibility-tree or console-message retrieval beyond raw Firefox output.

Maintenance

ActivityNo data
ResponsivenessSyncing

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