Deepsec Documentation Guide
vercel-labs/deepsec
Points the agent at deepsec's own docs to answer questions about initializing, configuring, resuming, scanning with and extending the vulnerability scanner.
Operate a managed Firefox/Marionette laboratory for privileged chrome-context experiments, content automation, real WebDriver windows, permission readback, and synthetic X11 clipboard controls.
Install Operate Firefox Marionette
$ npx skills add cyberful/cyberful --skill operate-firefox-marionette -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cyberful/cyberful operate-firefox-marionette --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cyberful/builtin/skills/operate-firefox-marionette .claude/skills/operate-firefox-marionette && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "operate-firefox-marionette" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionette into .claude/skills/operate-firefox-marionette/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "operate-firefox-marionette", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionetteType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add cyberful/cyberful --skill operate-firefox-marionette -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cyberful/cyberful operate-firefox-marionette --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .agents/skills && cp -r skills-src/cyberful/builtin/skills/operate-firefox-marionette .agents/skills/operate-firefox-marionette && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "operate-firefox-marionette" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionette into .agents/skills/operate-firefox-marionette/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "operate-firefox-marionette", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cyberful/cyberful --skill operate-firefox-marionette -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cyberful/cyberful operate-firefox-marionette --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/cyberful/builtin/skills/operate-firefox-marionette .cursor/skills/operate-firefox-marionette && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "operate-firefox-marionette" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionette into .cursor/skills/operate-firefox-marionette/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "operate-firefox-marionette", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/cyberful/cyberful.git --path cyberful/builtin/skills/operate-firefox-marionette--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add cyberful/cyberful --skill operate-firefox-marionette -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cyberful/cyberful operate-firefox-marionette --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/cyberful/builtin/skills/operate-firefox-marionette .gemini/skills/operate-firefox-marionette && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "operate-firefox-marionette" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionette into .gemini/skills/operate-firefox-marionette/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "operate-firefox-marionette", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install cyberful/cyberful operate-firefox-marionetteInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add cyberful/cyberful --skill operate-firefox-marionette -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .github/skills && cp -r skills-src/cyberful/builtin/skills/operate-firefox-marionette .github/skills/operate-firefox-marionette && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "operate-firefox-marionette" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionette into .github/skills/operate-firefox-marionette/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "operate-firefox-marionette", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cyberful/cyberful --skill operate-firefox-marionette -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cyberful/cyberful operate-firefox-marionette --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cyberful/cyberful.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/cyberful/builtin/skills/operate-firefox-marionette .opencode/skills/operate-firefox-marionette && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "operate-firefox-marionette" agent skill from https://github.com/cyberful/cyberful/tree/main/cyberful/builtin/skills/operate-firefox-marionette into .opencode/skills/operate-firefox-marionette/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "operate-firefox-marionette", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
operate-firefox-marionette- GitHub stars
- 135
- Token cost
- ~673 tokens
- SKILL.md length
- 239 words
- Files
- 2
- Skills in repo
- 85
- Repo updated
- First seen
- Licence
- AGPL-3.0
At a glance
Operate a managed Firefox/Marionette laboratory for privileged chrome-context experiments, content automation, real WebDriver windows, permission readback, and synthetic X11 clipboard controls.
- A browser-security discriminator depends on a specific Firefox executable
- SKILL.md covers Establish a baseline, Exercise one discriminator and Close and classify
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Chrome/content context
What it does
Operate Firefox Marionette is an agent skill from cyberful/cyberful. Operate a managed Firefox/Marionette laboratory for privileged chrome-context experiments, content automation, real WebDriver windows, permission readback, and synthetic X11 clipboard controls. Use when a browser-security discriminator depends on a specific Firefox executable, chrome/content context, Marionette responses, permission APIs, window lifecycle, or X11 clipboard ownership.
Its SKILL.md is about 670 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
It sits in Security. The repository describes itself as: Cyberful is an open-source AI Red Team for discovering, exploiting, verifying, and remediating vulnerabilities. The licence is AGPL-3.0.
When your agent uses it
- A browser-security discriminator depends on a specific Firefox executable
- Chrome/content context
- Marionette responses
- Permission APIs
Example prompts
- “/operate-firefox-marionette”
What it can do on your machine
Read from SKILL.md and the folder at commit ec598a6. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Operate Firefox Marionette loads about 673 tokens when it runs. Until then it costs about 103 tokens; SKILL.md has 239 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from cyberful/cyberful at commit ec598a6, republished under its AGPL-3.0 licence (© cyberful). 239 words, ~673 tokens.
Download SKILL.mdSave it as
.claude/skills/operate-firefox-marionette/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- operate-firefox-marionette
- description
- Operate a managed Firefox/Marionette laboratory for privileged chrome-context experiments, content automation, real WebDriver windows, permission readback, and synthetic X11 clipboard controls. Use when a browser-security discriminator depends on a specific Firefox executable, chrome/content context, Marionette responses, permission APIs, window lifecycle, or X11 clipboard ownership.
- metadata.domain
- security-tooling
- metadata.subdomain
- browser-laboratory
- metadata.triggers
- Firefox Marionette laboratory, privileged Firefox experiment, Firefox permission readback, chrome context browser test, X11 clipboard browser test
- metadata.tags
- Firefox, Marionette, WebDriver, browser-lab, X11
Operate Firefox Marionette
Use firefox_lab only for authorized browser-security tests requiring an exact Firefox build, Marionette/BiDi, chrome context, privileged permissions, or controlled X11. Use normal browser tools for program-platform browsing.
Establish a baseline
Record the executable/hash, target behavior, context, origin, permission, expected signal, controls, and teardown. Launch with expected_build_sha256 when known, call status, and retain its port, profile, display, capabilities, complete web_socket_url, process identity, and log. Consume the advertised BiDi URL verbatim; never derive an endpoint from its port.
For permissions, run an unseeded control first. set_permission uses Firefox's privileged API and immediate readback. A failed seed/readback is inconclusive. Never edit profile databases.
Exercise one discriminator
Use new_window, not synthetic gBrowser.addTab tabs. Create and record every race context before perturbing a content process. Use navigate and the smallest decisive execute script; request chrome only when essential. Check status before dependent work. For BiDi, create all Marionette prerequisites, call handoff_bidi, use its URL, and correlate responses by command ID. Marionette is unavailable after handoff.
For clipboard tests, set synthetic UTF-8, inspect only TARGETS/ownership, then clear it. Never read or retain real clipboard contents.
Close and classify
Always call idempotent close, including after BiDi handoff; it owns Firefox, Xvfb, profile, transports, windows, and cleanup. Use status process identity, never command-text PID matching (ps|awk, pgrep -f, pkill -f). Preserve build, controls, results, logs, failure point, and cleanup. Failed controls, transport/context loss, incomplete non-controls, or unreadable permissions are inconclusive harness results, not findings.
© cyberful, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in cyberful/builtin/skills/operate-firefox-marionette of cyberful/cyberful.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit ec598a6
Compare with similar skills
Operate Firefox Marionette next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Operate Firefox Marionette this skillcyberful/cyberful | 135 | — | ~673 | Automated safety check: Pass | AGPL-3.0 | |
| Deepsec Documentation Guidevercel-labs/deepsec | 8.1k | — | ~956 | Automated safety check: Pass | Apache-2.0 | |
| Skill Scannergetsentry/skills | 1k | 4 repos | ~2.5k | Automated safety check: Warn | Apache-2.0 | |
| Serenity Aleabitoreddityan-labs/serenity-aleabitoreddit | 481 | 1 repos | ~3.3k | Automated safety check: Pass | None | |
| Security Alert Triageelastic/agent-skills | 592 | 1 repos | ~3.5k | Automated safety check: Notes | Apache-2.0 | |
| Shiro Attack CLISummerSec/ShiroAttack2 | 2.6k | — | ~945 | Automated safety check: Pass | MIT |
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Questions about Operate Firefox Marionette
What does Operate Firefox Marionette do?
Operate a managed Firefox/Marionette laboratory for privileged chrome-context experiments, content automation, real WebDriver windows, permission readback, and synthetic X11 clipboard controls. Operate Firefox Marionette is an agent skill from cyberful/cyberful. Operate a managed Firefox/Marionette laboratory for privileged chrome-context experiments, content automation, real WebDriver windows, permission readback, and synthetic X11 clipboard controls.
When should I use Operate Firefox Marionette?
Operate Firefox Marionette fits situations like: A browser-security discriminator depends on a specific Firefox executable; chrome/content context; marionette responses; permission APIs.
How do I install Operate Firefox Marionette in Claude Code?
Run `npx skills add cyberful/cyberful --skill operate-firefox-marionette -a claude-code`. Or copy the skill folder (cyberful/builtin/skills/operate-firefox-marionette in cyberful/cyberful) into .claude/skills/operate-firefox-marionette in your project. Claude Code loads it when a task matches its description.
How do I install Operate Firefox Marionette in Codex?
Run `npx skills add cyberful/cyberful --skill operate-firefox-marionette -a codex`. Or copy the skill folder (cyberful/builtin/skills/operate-firefox-marionette in cyberful/cyberful) into .agents/skills/operate-firefox-marionette in your project. Codex loads it when a task matches its description.
Can I use Operate Firefox Marionette in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cyberful/cyberful --skill operate-firefox-marionette -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/operate-firefox-marionette, .gemini/skills/operate-firefox-marionette, .github/skills/operate-firefox-marionette and .opencode/skills/operate-firefox-marionette in your project.
What does Operate Firefox Marionette need to run?
SKILL.md names no scripts, command-line tools or credentials: Operate Firefox Marionette is instructions for the agent only.
Does Operate Firefox Marionette access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Operate Firefox Marionette safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Operate Firefox Marionette use?
Operate Firefox Marionette is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Operate Firefox Marionette use?
About 673 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Operate Firefox Marionette?
Skills that share tags, products or a category with Operate Firefox Marionette: Deepsec Documentation Guide (vercel-labs/deepsec, 8.1k stars), Skill Scanner (getsentry/skills, 1k stars), Serenity Aleabitoreddit (yan-labs/serenity-aleabitoreddit, 481 stars) and Security Alert Triage (elastic/agent-skills, 592 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Operate Firefox Marionette?
cyberful (a GitHub organization) maintains it in cyberful/cyberful, which has 135 GitHub stars. The repository holds 85 skills in this directory. The repository was last updated on August 24, 2026.
Source: cyberful/cyberful on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.