Model Context Protocol (MCP) server for inspecting, querying, and live-debugging Firefox UI DOM and CSS themes (userChrome.css).
View on GitHub ↗Homepage ↗Model Context Protocol (MCP) server for inspecting, querying, and live-debugging Firefox UI DOM and CSS themes (userChrome.css).
Add the server configuration to your MCP settings file:
1. Clone the repository and build the project:
2. Add the local build to your MCP configuration:
Flag Type Description :----------- :-------- :------------------------------------------------------------------------------------------------------------------------------- --nova-ui boolean Enables the Firefox Nova UI redesign preferences (browser.nova.enabled and browser.newtabpage.activity-stream.nova.enabled). --headless boolean Runs Firefox in headless mode without displaying a graphical user interface window.
- launchbrowser: Launches Firefox with chrome debugging capabilities enabled. - closebrowser: Terminates the browser instance. - customizetoolbar: Activates or controls the Firefox "Customize Toolbar" mode. - getuitree: Dumps the hierarchical DOM tree of the chrome window. - queryuielements: Queries elements matching a CSS selector in the browser chrome. - getcomputedstyles: Extracts computed CSS property values of a specific UI element. - injectthemecss: Dynamically injects or updates stylesheets in the live UI for instant feedback. - removethemecss: Removes an injected stylesheet. - takeuiscreenshot: Captures a screenshot of the browser window or a specific UI component. - executechromejavascript: Runs privileged JavaScript in the browser chrome window context.
From the project README.
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