Firefox Css Theme MCP server

by easonwong-de·io.github.easonwong-de/firefox-css-theme·v0.2.8

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

A92/100grade A

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Safety scan

A92/100

Adoption

Growing

3 stars41 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

close_browser
Close the running Firefox instance.
customize_toolbar
Activate or manage the Firefox Customise Toolbar mode in the browser chrome.
execute_chrome_javascriptwrite action
Execute privileged JavaScript code in the Firefox chrome window context.
get_computed_styles
Extract computed CSS properties for a Firefox UI chrome element.
get_ui_tree
Retrieve the hierarchical DOM tree of the Firefox chrome user interface window.
inject_theme_css
Inject or replace a live stylesheet in the Firefox window.
launch_browser
Launch a Firefox instance with chrome debugging capabilities enabled.
list_theme_css
List all custom stylesheets currently injected in the Firefox window.
query_ui_elements
Find elements in the Firefox UI chrome document matching a CSS selector.
remove_theme_csswrite action
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.

scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it

no findings

Code scan15 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitylocal package, no credentials required12/15
Maintenancelast push 2 days ago15/15
Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Overall 92/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

Runs npx -y firefox-css-theme on your machine. Read the scan report first; the gateway never runs local packages.

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

Is Firefox Css Theme MCP server safe?: Yes, by our scan: it is graded A (92/100). Read the Firefox Css Theme safety report
How do I install Firefox Css Theme?: It runs on your machine. Copy the Claude Code, Claude Desktop or Cursor config from the install section.
Does Firefox Css Theme need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Firefox Css Theme maintained?: The last commit was 2 days ago (2026-09-18). The latest release is v0.2.8.