io.github.easonwong-de/firefox-css-theme

Registre officiel Outils de développement

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

Que pouvez-vous faire avec io.github.easonwong-de/firefox-css-theme ?

launch_browser: Launches Firefox with chrome debugging.
close_browser: Terminates the browser instance.
customize_toolbar: Toggles the Firefox "Customise Toolbar" mode.
get_ui_tree: Dumps the hierarchical DOM tree of the selected UI element.
query_ui_elements: Queries elements matching a CSS selector in the browser chrome.
get_computed_styles: Extracts computed CSS property values of a specific UI element.
inject_theme_css: Injects a stylesheet into the live UI.
remove_theme_css: Removes an injected stylesheet.

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

NPM package firefox-css-theme

Claude Code

claude mcp add firefox-css-theme -- npx -y firefox-css-theme@0.3.5 mcp

Configuration JSON (Claude Desktop, Cursor, VS Code)

{
    "mcpServers": {
        "firefox-css-theme": {
            "command": "npx",
            "args": [
                "-y",
                "firefox-css-theme@0.3.5",
                "mcp"
            ]
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire

Firefox CSS Theme
Getting Started
MCP Server Usage
Available MCP Tools
Commands

Firefox CSS Theme

A toolkit for scaffolding, live-debugging, and installing Firefox CSS themes. For agentic DOM inspection and live styling, an MCP server is also available.

Getting Started

[!TIP] You need Node.js to get started.

For Theme Authors

Scaffold a new theme project using npx:

npx firefox-css-theme create

This interactively prompts for your theme name and stylesheet targets (userChrome only, userContent only, or both).

If you have already opened a theme repository, launch Firefox with live CSS hot-reloading:

npx firefox-css-theme start

[!NOTE] Theme entry files (userChrome.css and/or userContent.css) must be located at the root of the project directory.

For Theme Users

Navigate to the theme directory and install the stylesheets:

npx firefox-css-theme install

The toolkit will look for userChrome.css and userContent.css in the current directory, and install them into the selected Firefox profile.

For the full list of CLI options, run npx firefox-css-theme --help.

MCP Server Usage

The MCP server enables AI assistants to inspect the Firefox chrome DOM, query computed styles, inject custom CSS, and capture UI screenshots in real time.

Configuration

Add the server to your preferred client or development environment:

Claude Code

claude mcp add firefox-css-theme -- npx -y firefox-css-theme mcp

Codex

codex mcp add firefox-css-theme -- npx -y firefox-css-theme mcp

IDE MCP Configuration

{
    "mcpServers": {
        "firefox-css-theme": {
            "command": "npx",
            "args": ["-y", "firefox-css-theme", "mcp"]
        }
    }
}

Available MCP Tools

launch_browser: Launches Firefox with chrome debugging.
close_browser: Terminates the browser instance.
customize_toolbar: Toggles the Firefox "Customise Toolbar" mode.
get_ui_tree: Dumps the hierarchical DOM tree of the selected UI element.
query_ui_elements: Queries elements matching a CSS selector in the browser chrome.
get_computed_styles: Extracts computed CSS property values of a specific UI element.
inject_theme_css: Injects a stylesheet into the live UI.
remove_theme_css: Removes an injected stylesheet.
list_theme_css: Lists all currently injected stylesheets.
take_ui_screenshot: Captures a screenshot of a specific UI component.
execute_chrome_javascript: Runs JavaScript in the browser chrome window context.

Commands

`firefox-css-theme create`

Scaffold a new Firefox CSS theme project.

Usage

npx firefox-css-theme create [options]

Options

Option	Description
`-n, --name <name>`	Theme name
`-t, --target <target>`	Stylesheet target: chrome, content, or both
`-f, --force`	Proceed without warning

`firefox-css-theme start`

Launch Firefox with live stylesheet bundling and hot-reloading.

Usage

npx firefox-css-theme start [options]

Options

Option	Description
`-b, --binary <path>`	Path to Firefox executable
`-p, --profile <name>`	Firefox profile name
`--headless`	Run in headless mode
`--atbc`	Start with Adaptive Tab Bar Colour
`--no-toolbox`	Disable Browser Toolbox
`--no-watch`	Disable file watching

`firefox-css-theme install`

Install compiled stylesheets from the current working directory into a Firefox profile.

Usage

npx firefox-css-theme install [options]

Options

Option	Description
`-p, --profile <name>`	Firefox profile name
`-m, --merge`	Merge with existing stylesheets
`-f, --force`	Proceed without warning

[!WARNING] This operation will overwrite existing CSS themes in the profile unless --merge is specified. A backup is advised.

`firefox-css-theme mcp`

Start the Model Context Protocol (MCP) server.

Usage

npx firefox-css-theme mcp [options]

Options

Option	Description
`-b, --binary <path>`	Path to Firefox executable
`-p, --profile <name>`	Firefox profile name

Questions fréquentes

Qu'est-ce que io.github.easonwong-de/firefox-css-theme ?

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

Comment installer io.github.easonwong-de/firefox-css-theme ?

Il s'exécute sur votre machine. Dans Claude Code : claude mcp add firefox-css-theme -- npx -y firefox-css-theme@0.3.5 mcp. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour io.github.easonwong-de/firefox-css-theme ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

io.github.easonwong-de/firefox-css-theme est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient io.github.easonwong-de/firefox-css-theme ?

Il est publié par easonwong-de. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.

Détails du serveur

Référencé dans: Registre MCP officiel
Éditeur: easonwong-de
Catégorie: Outils de développement
Exécution: Local
Étoiles GitHub: ★ 3
Licence: MIT
Langage: TypeScript
Dernier commit: 25 oct. 2026
Tickets ouverts: 0
Version: 0.3.5
Publié le: 25 oct. 2026

io.github.easonwong-de/firefox-css-theme

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