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

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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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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 (18 days ago)
Last release: Oct 13, 2026 (18 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 Registry github-graphql

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Cite this page

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