firefox-browser

firefox-browser is a skill for Claude Code from kwannoel/the-controller. It costs 85 tokens per session (4,681 once invoked), scanned C, original, MIT.

A Firefox automation skill for AI agents using Playwright, a tool for controlling web browsers in code. It uses the user's real Firefox profile, copied to a temporary location, so cookies, extensions, and browser settings can be available during automation.

In plain words
What is it for?
Use it to navigate pages, fill forms, click controls, take screenshots, extract information, or test a web application in Firefox.
Why use it?
It supports Firefox-specific tasks while reducing problems caused by a new, empty browser profile. Using a copy also avoids conflicts with a Firefox session that is already running.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is console.log('Video saved to ./videos/');.

Good fit Use it to navigate pages, fill forms, click controls, take screenshots, extract information, or test a web application in Firefox.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/kwannoel/the-controller
agentmods
npx agentmods add skills/kwannoel/the-controller/firefox-browser

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for firefox-browser

README.md
[![agentmods](https://agentmods.dev/badge/skills/kwannoel/the-controller/firefox-browser/github.svg)](https://agentmods.dev/skills/kwannoel/the-controller/firefox-browser)
Your own site
<a href="https://agentmods.dev/skills/kwannoel/the-controller/firefox-browser"><img src="https://agentmods.dev/badge/skills/kwannoel/the-controller/firefox-browser/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for firefox-browser

Your own site · 80×15
<a href="https://agentmods.dev/skills/kwannoel/the-controller/firefox-browser"><img src="https://agentmods.dev/badge/skills/kwannoel/the-controller/firefox-browser.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 85 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,681 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00085 $0.04681
Opus 5.5 $0.00034 $0.01872
Sonnet 5.5 $0.00017 $0.00936
Haiku 4.5 $0.00009 $0.00468

Measured 1mo ago against content hash 4bf5903ab178, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

firefox-browser scanned grade C with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

The scan reads SKILL.md. This mod also ships 3 executable files (templates/authenticated-session.sh, templates/capture-workflow.sh, templates/form-automation.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

execSync(`rm -rf "${tempProfile}" && cp -R "${sourceProfile}" "${tempProfile}"`);

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

const { execSync } = require('child_process');
skills/firefox-browser/SKILL.md · 620 lines

How it starts

The opening of the file, as written. The whole thing — 620 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Firefox Browser Automation with Playwright

Always use the user's real Firefox profile instead of launching a fresh automated instance. Fresh automated browsers get flagged by bot detection (Google login bans, CAPTCHAs, account locks). Using the real profile inherits cookies, extensions, and fingerprint.

Uses Playwright's Firefox engine. Install with npx playwright install firefox.

Setup: Find Your Firefox Profile

# macOS
ls ~/Library/Application\ Support/Firefox/Profiles/
# Look for: xxxxxxxx.default-release

# Linux
ls ~/.mozilla/firefox/

Set the FIREFOX_PROFILE env var for convenience:

# macOS
export FIREFOX_PROFILE="$HOME/Library/Application Support/Firefox/Profiles/YOUR_PROFILE.default-release"

# Linux
export FIREFOX_PROFILE="$HOME/.mozilla/firefox/YOUR_PROFILE.default-release"

Core Pattern — Use Real Profile

Copy the user's profile to a temp directory (avoids lock conflicts with running Firefox) and launch with it:

node <<'SCRIPT'
const { firefox } = require('playwright');
const { execSync } = require('child_process');
const os = require('os');
const path = require('path');

(async () => {
  const sourceProfile = process.env.FIREFOX_PROFILE;
  const tempProfile = path.join(os.tmpdir(), 'firefox-automation-profile');

  // Copy profile (preserves cookies, extensions, history)
  execSync(`rm -rf "${tempProfile}" && cp -R "${sourceProfile}" "${tempProfile}"`);
  // Remove lock files and compatibility markers (Playwright's Firefox is a different version)
  execSync(`rm -f "${tempProfile}/lock" "${tempProfile}/.parentlock" "${tempProfile}/parent.lock" "${tempProfile}/compatibility.ini"`);

  const context = await firefox.launchPersistentContext(tempProfile, {
    headless: false,
  });

  const page = context.pages()[0] || await context.newPage();
  await page.goto('https://example.com');
  await page.waitForLoadState('domcontentloaded');

  console.log('Title:', await page.title());
  console.log('URL:', page.url());
  await page.screenshot({ path: '/tmp/firefox-screenshot.png' });

  await context.close();
})();
SCRIPT

Read the full file on GitHub · 620 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 620 lines · 85 tokens per session scan C 4bf5903ab178

Subscribe to this mod's changes

firefox-browser is a skill published in the GitHub repository kwannoel/the-controller (13 stars, last pushed 6mo ago), licensed MIT. It adds 85 tokens to every session and 4,681 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it C with 2 findings (recursive force delete, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-23.

Related

firefox-browser compared with skills from other repositories

firefox-browser next to 6 skills from other repositories
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firefox-browserkwannoel/the-controllerSkill136mo agoMITC85Claude Code
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