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Firefox Css Theme

MCP for building, inspecting, and live-debugging Firefox CSS themes.

Connector by easonwong-de · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)★ 3
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Install

Works with Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/easonwong-de-firefox-css-theme

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

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About

MCP for building, inspecting, and live-debugging Firefox CSS themes.

Reviews

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No reviews yet. Installed it? Reviews come from verified installers only. How reviews work

Permissions

What this server can do and what it asks for, from its tool list, install config and code. Checked Oct 25, 2026.

Tools
5 read · 1 write · 2 delete · 3 not yet classified
Secrets
None asked for
Install scripts
None found
Runs as
Node.js package

Tools by what they do 11

Read from the source code; the running server may list different tools.

Read 5 · Look things up without changing anything.

  • get_computed_styles
  • get_ui_tree
  • list_theme_css
  • query_ui_elements
  • take_ui_screenshot

Write 1 · Create, change, send or run things.

  • close_browser

Delete 2 · Delete, drop, revoke or wipe things.

  • execute_chrome_javascript
  • remove_theme_css

Not yet classified 3 · We could not tell from the name and description.

  • customize_toolbar
  • inject_theme_css
  • launch_browser

Network hosts it talks to 1

  • github.com · found in code

Files it touches

  • Your home directory (~)

Tools (11)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • close_browser

    Close the running Firefox instance.

  • customize_toolbar

    Activate or manage the Firefox Customise Toolbar mode in the browser chrome.

  • execute_chrome_javascript

    Execute privileged JavaScript code in the Firefox chrome window context.

  • get_computed_styles

    Extract computed CSS property values for a Firefox UI chrome element.

  • get_ui_tree

    Retrieve the hierarchical DOM tree of the selected UI element in the Firefox chrome window.

  • inject_theme_css

    Inject or replace a live stylesheet into the Firefox window.

  • launch_browser

    Launch a Firefox instance with chrome debugging capabilities enabled.

  • list_theme_css

    List all custom stylesheets currently injected into the Firefox window.

  • query_ui_elements

    Find elements in the Firefox UI chrome document matching a CSS selector.

  • remove_theme_css

    Remove an injected stylesheet from the Firefox window.

  • take_ui_screenshot

    Capture a PNG screenshot of the Firefox browser chrome window or a specific UI component.

Signals

Stars
3
Forks
1
Open issues
0
Last commit
Oct 13, 2026 (15 days ago)
Last release
Oct 13, 2026 (15 days ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name
io.github.easonwong-de/firefox-css-theme
Version
0.3.4
Auth
No auth
Packages
npm firefox-css-theme
License
MIT
Repository
github.com/easonwong-de/Firefox-CSS-Theme
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql
Cite this page

Firefox Css Theme MCP server. Agent Mart. https://agentmart.dev/connectors/easonwong-de-firefox-css-theme (last updated 2026-10-24)